Inferno #09 31 июля 2006

Железо

Repair - Repair Radios Panasonic.

      Ocherednaya electronic stuff ...


   In autumn 2005, having called in Krasnodar, I saw
y brothers "old friend" - cassette recorder
Panasonic RX-ES22 (like "Boombox", is maximal
cue lcd, CD, digital tuner, touch CAS
setnik full hitch, without reversing,
digital pre-equalizer, cha
raw / timer). Cassette friendly pomigivala
dropped (power off) for hours
enticing them to install. But I overcame temptations
of, and not to do it ...



   Remember: a year or more ago, with each
Plant brought me in just such a repair.
Not working CD. Drunk closing, pushed
 tray, breaking a gear.

   Repairs required some degree of patience
of, accurate and reasonable approach. Sloe
Mun was one tooth and a bit of cleaved neighbor
 tions, eventually tray froze halfway ...

   Manufacture gear I own
could not (can not imagine how this ETS
lat, except that the sample as an extreme metal
py), to buy could not - was not. Decided Correctional
vit gear itself - a pity: it is almost all
 intact.

   Used a segment about a thick (with
respectively - very hard) vyvoda.Ot
kusil about 5 mm, previously well
it opayav.Vplavil exactly in the middle position
Future of the tooth, a little bit off the tip of the conclusions
Yes, and holding it with tweezers, rounded
Needle file. Holding a very plastic,
apply a little solder, for thickening, and under
leveled needle files (removed the excess, leaving
approximate shape of the tooth). Given the small
tooth size and thickness of the withdrawal, rigidity would
la is quite normal, but keep this -
"Young" - a tooth in one section only
O I have not decided. Yes, and it was necessary to form
 bring to a more complete.

   Then I turned to the traditional "Be
scrap the glue (polyvinyl acetate, cheap).
Of its good features should be noted
tit hardness and uniformity of mass after
drying, which long lifetime for small
thickness formula, as well as the possibility of "correction
tion, if this mass of warm, then
 It is almost as hard "freezes."

   I apply glue several times through Poltja
ca (for drying). Every time applied with
taking into account the shape correction (more than adding to
missing sites), at the same time, "added the" tooth
which skololsya. Bust a temptation to
waited day by placing gear at the battery,
for better drying (heat and flow of excitation
spirit). After that very accurately obshku
 Reel "needle files and some very nazhdachkoy.

   The resulting "work of art" obviously
Hb was like a new part, but the shape of the tooth,
Of course, a little different, and in the thickness
 Plastics rayed segment output.

   All trouble-free, although space
process of opening / closing the tray was observed
a small deviation in passing problem
 a lot of space.

   Brushing / brushing all the mechanics and laser
heads, I put together a little cassette recorder and its
popolzovavshis. I really liked the "dzhogdayl (wheel with an 
endless, fixing scrolling). They very quickly / conveniently 
possible select preset stations

tion, skip / select songs on the CD and conditions
tanavlivat time clock and taymerov.Posled
I liked it more than some vsego.Do
second speed changing moments, and then determine
divided by the excess "running clock" (acc
tstvenno a low rate, you can "communicate"
minutes). I came to the conclusion that it is the most
quick way to set the time, not counting
keypad entry, which (the extra "0"
- "9": 10 pieces) often are not. Although
bullet entry (you can posoperni
chat, even with numbers) to require good
ordination, such a "free-ease" mouth
Novki I have not seen - rulez!


                 Continue


   But that was long ago, and remembering the case
a brother, I remembered the watch, dial,
analog, NFS 4 for PSone, thinking that there is
something good even in such things
not particularly attracted me. I also remembered
about nedostatkah.Sobstvenno, I did not like
sound. Like most radio in general and
play the CD. As if the "dry 16-bit,
so even with a distorted transformation. Although
the whole thing, probably, in the imperfection of the filter
tions power circuits and digital domeshivanii
interference in the already analog zvuk.Korpus columns
parasitically also resonated, though love
carriers bass sound is generally good. In addition to this
On tape recorder required 4 finger baht
reiki (format "AA") to store the settings
in memory when power failure. Hence the
flash clock with indication "0:00" sign
errors of data storage - no power. Pom
nitsya, if the battery for memory and from
presence of major (large round, it seems
camping, size "D") and the network when you try to include
radiation screen instead of hours showed "the system
mnoe "message" U02 ", sometimes" U01 ". Then
I did not understand why so many different ways
Therefore, as a guest, remembering, thinking - as there
getting on the "my baby" Do not break ...
Subconsciously, I had a premonition: it is possible
still see her ...

   In the spring of this year's tape recorder "is true
las. "Trying to be powered by a rechargeable battery with
reverse polarity turned silence
it ... Random change (embodied in the pa
diatore) stereousilok and transistor stabilization
lizatora.I for lack of results formed
tilis me, passing the unit and the old
details.

   Thankfully, the chain of protection were provided
Ny and save the scheme. Carefully replace propayal
nennye components and checked something on the
case of significant degradation in performance.
Put ceramic fuse, placed
Reel operating voltages and assembled system.
Rung former usilok - like, defective,
of continuity can not say exactly, but claims
no. The transistor is also defective, with a good
gain (I think, as many as 140 times). But reserves
ivat back to old parts does not make sense.
Marriage transistors that level - redchay
neck exception, operating mode spectrum
nzistora far from the boundary parameters, and
stabilizer "knows his stuff." A usilok,
visited "the other side of the polarity of pita
of "no more reliable than purchased new.
And the old parts will be on the safe case
tea ...

   I'm a little popolzovavshis and noticed that
settings are not saved. It is not surprising -
batteries for memory oxidized, and total
multiple voltage above 4 volts. Withdrew
batteries, and thought that would be good to post
vit batteries, even more so - they are there.

   Old disk batteries D 0,1 /
A .125 is not able to keep large
Current, but today's chip-memory and
quartz watches with lcd should be fine ...
Only question is, how much they will suffice.
No wonder that the format "AA" stuck. But I consider
read, that the system, basically, almost no
takes the current to the memory and short-term possibility
ble peaks (say, at operation that
ymera) batteries survive. On accumulators
tori, I stood in the figures - the current at which
rum drop is not too large, one
0.5 mA! They have long lie. Internal
contact (spring) is destroyed, and the compression yew
kami for horosheo contact (as
once wrote in the magazine "Radio"), will not
good result.

   Measurements of current, I was glad to find that
it is only 0.1 mA (mostly), but the throw to
milliampere level. Sealed in a "transformation
torny compartment "rezyuk for recharging and a hundred
bilitron to limit stress. On
poludohlyh batteries, it can exceed
Sit the normal value of the charging current and
I did not much matter passes through zadavatsya
excitation supply circuit memory. Then I soldered
series 5 (with a margin of decline)
batteries, solder them to your contacts baht
Raynaud's compartment. In addition, he placed it by you
rectifier KD202 (dual supply current)
and to the internal fuse. And,
drilling a small hole, from the battery
of a transformer compartment, connected gne
health of a 9-volt batteries to supply
External napryazheniy.Gnezdo was very complex
compact and fit even with the inserted
batteries, and LED allow experiment
synchronized with the polarity of the magnetic field without 
damage cassette recorder. However, for powering through the slot

it was necessary to fit the plug to disconnect
batteries (I did not put the diode for cars
switching - will be unnecessary loss of voltage
of a battery). Washing through the connector
worked, and the batteries were the problem.
Time lost their inclusion without trying
network.

   At first I thought they were too old
and should be well zaryaditsya.No and proshest
under the condition of the day, when the charge should have 
been enough already for a week, glitches remained. I otbrako

shaft of the weakest and emissions, replacing those
that the stronger (was already one such, and
be tempted to use it). But by
following two days of charging, after standing overnight without
failure and not having lost from clicking the inclusion
without a network, the time got lost when I'm stuck
plug in set.Poslednee circumstance was
quite an unpleasant fact: the power went, and
hours huddled! Had to find ...

   I began to measure the current drawn by the accumulative
mulyatorami. Basically, 0.1 mA, but pressing
TII buttons (no network), the current at the time of pressing
Tia increased to 0.5 mA, depending on the
what buttons it can zhmesh.S Miri
tsya - Battery tyanet.No feeding peaks
Tania pulse current was tens of mA! Next
revealed that the first attempt to include
without a network gives an equally strong impulse that
ka, leading to a crash. Moreover, when the foundations
Noah current pulse passes, there is about
10 mA for a few seconds. Not surprisingly,
that a failure! Even more interestingly, that the failure been
exists if, immediately after turning off (the LED
already turns red) - for semimetals
chickpeas - pull the plug from seti.A if Pos
dnee - all O.K.!

   Even in the selection of batteries I dopayal
germanium diode in the chain of charging for
exception of discharge through the power circuit for
to fit the plug (when the rectifier is connected
chen to the unit, and batteries disconnected). AND
it gave a weak effekt.A now I suspect
shaft, the diode pierced, although he knew that he used
right - check. But the failures caused a
am feeling ...

   Began with the scheme razbiratsya power memory
TUE. I figured that I could block the powerful currents, 
leaving the food directly memory and clock. 6 In a battery is

low-power integrated stabilizer with a small
lym falling to 5, and then set
chains and keys (harder than I thought). More
until the stabilizer is npn emitter
follower as a low-power regulator on
12 V (as usual: Zener with base
minus). Everything looks quite reasonable and not
tally with failures "imminent shutdown" ce
Tea and possible current pulse - Discharge
through the power circuit. In the end, from the base
tareek (last time) such nonsense, SC
opinion that is not there! Judging by the scheme, the excess
memory power is not terrible, and I solder
connector and connect the old battery on the
9, which is exactly pull (on the backlight
normally use). Connect it after the di
ode (faced batteries 6) not to
plant to the batteries and start experiments
ments by measuring the current consumption. Failure is not -
battery pulls, but very suspicious
powerful current surges present ... suspicious
Indeed powerful shots!

   Conclusion: probably not for nothing that included ba
tareyki "AA". On the other hand - insanity!
Well, why do we need these pulses?
After hours and memory (indicated on the cover -
namely food memory) take very little, and
other nonsense - transients and PA
razitnoe consumption. What's interesting is, after
dnee taking into account the rarity and power commensurate
Roman with the consumption of memory (depending on how
often turn off the power supply). T.e.energiya
half goes nowhere! And if we consider
that of 6 in a 5, then a small
Drawdown of batteries, who gave only one-third
its capacity will require the purchase of new -
there is industry pumping money shocks
ers, based on an agreement about
turers equipment and batteries.
Disorder! It is not good to do so with us!
And I intend to at least this case to stop!

   Disabled (via the connector) akkumulyator.Po
try to understand the cause of the failure by the vanishing
network, the first few seconds after shutdown. By
measuring of voltage fluctuations in the rectifier
we can assume the delay energopotreb
leniya.Napryazhenie immediately jumps - almost
th to load, but after a while
is it a failure, almost to the worker, and
but then it rises to the circuit.

   Left Thought: ... the system unsubscribe coc
Toyan on powerful memory ... In fact,
likely transients in amplified
body, which are accompanied by increased
consumption of energy. Increased consumption
energy is common to many sites in the NAM
Mummers 50-70% of normal (in which
circuitry can provide economical
ity). It is clear that at the time of collapse and disappear
zaniya power supplied to the control
circuit power consumption significantly
increases. But how critical and pain
PWM voltage should be to give
failure? Sets the time, waited 25 seconds
(Skipping failure) and pulled the plug.
Capacitor power only began discharging
tsya, shake the inclusion of - failure. The next time
take the resistor discharges the Conder to 10 - and
again failed to include. Now discharged
Conder in 33 ohms and I get a crash hours -
without any attempt at power-up! General insanity! Tor
Yes discharged for a long time - almost to zero, through
1 k - and no failure, even when trying
inclusion. Discharge the capacitance of up to seven - failed
of inclusion. At lower voltage failure
not (the system and does not try to include, issued
curve "U02" on the screen), but closes Conder
Power of 33 ohms - failed! Failure monitors
Camping with a few volts of residual NAP
masking on the condenser. For example: ma
gnitolu disconnected from the network (switch connector
creased on batteries), has decided batteries bases
Nogo power to change, and of course contacts
compartment clean, and climbed to plus (and he
deeper minus) korotnul on negative - and all
flocking station (batteries memory were
run down). Here's a surprise ...

   Subconsciously am feeling: the battery "extinguished" by a 
power circuit, although insanity - again mated through emitter 
follower than you its utter opposite (while reducing the 
potential potential of the collector, and he was on base rezyuk

- With a zener on the minus sign)? Transit
Store npn type, not net the same ... Of course,
not a bad thing, just a plus ... Is that on the other
On the other chains, under the designation extra track
You can not miss. Again carefully wasps
conditions that included the stabilizer 12 and details of other
On the other side of the board. Dynamics! Abrupt discharge
- Crash! The reason has been found!

   Base Repeater shunted electrolyte
one that may be discharged except for
base (zener voltage of nearly
sat down and closed) and it is - the same plus
opens the transistor in the fall of potential
potential on the collector (the emitter potential
battery power of memory). At slow
Mr. Conder discharge rate of decrease in stress
tion forms a small potential difference
between the base and collector (who is "me
tsya "with the emitter sites), Conder base times
ryazhaetsya through the resistor chain collector-ba
for at Conder himself the power and potential difference
potential difference is small - does not open tranzyuk. But to
Then the load is active and power is lost,
or when you try to enable, without the network, the rate
the rate of decay of the voltage on the power Conder
noticeably lag behind the building
base, and transistor otkryvaetsya.Konechno if
swap the collector and emitter, Wuxi
inflammatory properties do not exceed several
times, but it is enough to generate
tens of milliamperes leakage Batteries
ditch, which, when worn, noticeably asking
FLS - and watch stray.

   As for the similar failure of
batteries (because they are more powerful), they
stress when they are hooked, too, will
insufficient, given the input cutoff
diode, despite the lower drawdown. Poschi
Tai: run down by a third battery, even with
left (they are overvalued after the rest of EMF)
no more than 1.4 - in the amount of 5.6, then the diode
- Cuts more than 0.5 V. The remaining 5 in - without
stock, they are lossless are integral
LIMITED stabilizer because of its sovershens
TSS, but the subsequent drawdown of a few
tenths of a volt will cause a crash.

   To correct this defect, I changed
jumper (fortunately, they are sufficient to
do not cut the track) on a germanium diode.
The scheme is slightly broken - voltage too low
but, in fact, considering the following
chain, you can put any diode, a gain
let the small, but there ... Now the chain repeat
solvent, net of microamperes, the leakage can not give
could. After that I again poeksperimenti
synchronized with the work of the unit, measuring the current ac
kumulyatora. Failures became less frequent and now
depended on the disappearance of the network off
condition, and determined attempt to include
of when a missing / appears / disappears
pitanii.Brosok current was now almost twice as
less, but almost reached 20 mA. And I knew
that after the integral stabilizer is
keys with which to understand ...

   Both keys were run inverters and pa
develop the highest signal to enable the processor,
but one is still triggered by the presence of
network (variable component). So on
way: when you try to enable the radio - on
Keys, "was selected" additional current from the
batteries (since there is no network), and only
through time (presumably so programmed)
tale was filmed and closing keys
were, although the power supply is no longer detector
nal one vhodov.Sootvetstvenno,
during the discharge Conder, until the voltage across it
exceeds the battery voltage, its current
"Replace" their current, with a further reduction
Institute of battery consumption. I
found a general jumper enable signal
nutrition and put key here (pnp),
at which the signal from the inverter
(Npn), whose base (it is shunted to
general, the interference 47 nF) was treated with bias
through 56 ohms of the divisor: Zener on
7.5 (picked up a miniature), and resistor
5.6 ohms. In tests the peak thrust is
ka batteries do not exceed a few
mA. Now, when the voltage drops Conder
8 In the tell-tale "disappeared" and loaded
CAD keys too. Remaining current is still
markedly squander little old Batteries
algebra, and more frequent attempts to include
I got crash hours. Now it has achieved.

   But the room for complacency does not like. A
suddenly has a key open? Although I have a pony
small that the chip (processor) also takes the op
definition of the current mode of activation, and it is not
will decrease ... In general, the chip a few conclusions
Dov supplies, and everything is possible ...

   To "catch" the current balance, I use
call of resistors 1 ohm - solder in them instead of
jumpers, and by measuring the fall in mV, learned,
for any circuit consumes tok.No made
error ... As a result, a single jumper on the
path to the processor measured balance, but through
all subsequent nothing was going ... Current as
though disappeared. Some jumpers entertained
processor, and I exclude those of its conclusions (they are, I
already boring), but I understood that something upus
Teal ... However, I completely forgot about the miniaturization
rny throttle.

   Looking around the track in the corners of a processor
(Where there are no pins), who dived under it,
I noticed the signal, which was supposed to be
any excess power, or general. But all
Feed I vyzvonil - maybe general?
The path was below the marker, and it was evident
to any signal shla.Prishlos her gently
incised. It turned out - nutrition, I vyzvonil her to two 
conclusions. One of them clearly there was a jumper on the 
other, presumably In fact, different. And then I noticed the 
difference in sentences of the tester for continuity - all on

unit, unstable! Hence, one signal
is not directly. Then I remembered John
inductance - and went through her food.

   But I was wrong much earlier - as before
put power output through one of the variables
mychek from which are not directly visible
paths to a conclusion. When vyzvanival food
from the bridge to the conclusion it's called on the PA
parallel circuit, through the throttle. It was
match - fell to a conclusion pitaniya.Esli
it was another signal, I would "not found" ne
remychku on the findings, and (to ensure) associ
Neil would have it to the right place - not pro
core processor.

   Of course, I forgot about the throttle, but it
the second error, and if not for attention - for
methyl additional unrecognized road
ku for the processor - I'd been looking for propane
vshy current. Measurements of resistance of the coil -
about Ohm - I used it to determine
of current flow and found the missing
ostatok.Vyhodit that the entire current eats the chip itself.
A lot, but normal for the active mode.
Hence, it is not abated. True, the clock may
fed through a different conclusion - but in other
I supply current hours do not nameryal, although he could
be too small for registratsii.Vozmozhno,
I missed a chance to separate food and hours
memory to some conclusion ... I before
put something else: when you turn the chip consumes
part of the current on any control circuit, and
it could be turned off. Looking coc
Toyan when running on the network (just as, and
current consumption in the amount of residue), I'm from
methyl multiple tracks hanging in a logical
What the unit, but consumption of them was not
negligibly, and on this I have finished the analysis of the 
scheme. 

   Carefully placing its makeweights and from
payav diode and circuit recharging otse
Re transformer, I soldered 1.5 ohms for months
those silicon diode - Input power
memory, to recharge the internal circuit
from the repeater / stabilizer 12 V. Of course,
Diode I decided to put, but Germany
vy to once again not to reduce stress
batteries. But, is going to fall 0.4
(6 mA - current "active processor), I
decided to greedy ... Took one of the oldest
Ge tranzyukov (P27 - metallostek
lyannaya hat) as usual, timed and NADI
fats on the body of the gain (already 72 times) - and
decided to use as a switch. Persuading
shis in negligible leakage at 9 volts (lish
tions the current charge would be, but the main thing -
not broken), I locked the base of collectors and with
measured only 0.18 at a time! Parameters to it
was not, but apparently - a low-power, low
quency and gain - great. Slightly
flattened a side cap for compactness,
soldered it in parallel rezyuku. Maznul for
shelled area track tsaponlakom and proper
The integral system.

   Then pulled the batteries and to dopayal
its recent D 0.125 (still not there, nor
stayed here). Of course, this is not the mind
but. At least now, with more operating systems
tatke voltage batteries Conder
will squander, but the key cuts, and
current balance is compensated with stock
EDS surplus of excess battery. By
revenge of batteries in a compartment under the "AA" (both
rnuv them in cardboard and tape), I filled the new
battery in a few places with white glue.
If necessary, it is easy to peel -
and remove the battery without damage to
rpusa (they solder to the terminals under the baht
yards).

   By my calculations, the total charge can
take a week, given the high domestic
resistance of the battery. A discharge
outside the power they need more than a month, but
even if some of them developed a capacity for
month should be enough ... And in any case,
If occasionally, even rarely, use the
tape recorder, it is unlikely the batteries are fully
sit down and watch stray.

   In the process I think I found a Listing
snenie rare (in contrast to the "U02") "system
dark "post" U01 ". It appears
after attempts to include in the absence of network
(Work on batteries) and speaks of their time
a number of hindering the normal functioning -
system shuts down. It also appears when
try to enable, without the batteries, if the voltage
mapping the network had just lost (capacitor
not had time to blow off steam). But when the batteries
there is no network too (the capacitor has a discharge
wives), then when you try to enable appears
message "U02". The first reports on the propane
Denmark, the lack or weakness of power, and
second - on its complete absence.

   There is one more mystery: how to lose
counter at the cassette - what a combination
Action / clicks. Counter - really
good thing, but it is very rare
encountered in modern technology. He used
uses pulses of rotation sensor, iznacha
flax being applied to avtostopa.Konechno,
in cases where stipulated autosearch
sound fragment, the counter is not needed. Pra
SCBA, it reflects (albeit nonlinear) current
At the present time is just playing storony.Ya
I do not remember if I dropped the state counters
ka.

   And also interesting to see cover
exists whether kasetnik least play films
2 nd and 4 th type (chrome - hi position -
and metal particle - metal position). Judging
the absence of sensor type tapes - hardly
Do. And do not think that the correction can preamplifier
tanovit manually. Magnetic detection is also
rarely used. Sorry if kasetnik pa
been operating with only the first type. However, to
additional operations are possible from the remote,
I've never seen ...


              Panasonic + ...


   About a week (while I was up to
ma) The battery in the clock until
tape recorder, "rested" on the bookshelf ...
Back, glanced at his watch and thought - Accu
mulyatory still good, though something heavy
chick ... Decided a few days to recharge and Let us see
Ret drawdown.

   Ended the second week, when called in
Taras, and I decided that he will take the radio,
I have not tested / not charged the accumulators
Tori, but the clock went ... However, as soon as I
included plug into the network, the clock fold! To
Of course, batteries are hooked and gave tangible
my failure of power, but the reason for failure
alarming. Tensions mounted (on
network), and in this case was a failure! Cassette / activation
virovala their activities - according to ne
variable component, the voltage signal
which was growing faster than supply, and
at the time of activation, when the tape recorder including
Chala (or activated) a key with the presence of
network, batteries squander until
long as the voltage from the rectifier is not excited
melt to the level of battery (a little
above). Generally, such a miserable time was not critical, but 
is stranded accumulator ATR was enough for a sboya.K

Therefore, the same supply network could "drag on" because of
bounce forks and problems in the most
network, and, accordingly, subsidence Batteries
ditch, too, was delayed with an increase in the probability
surface failure.

   I did not put the second key (interrupt
yuschy signal the availability of networks to rise to
voltage power supply) for a rare commutation
onnyh problems coinciding with the shrunken Accu
mulyatorom. Apparently, such a coincidence when
Taras came and happened.

   Taras asked to build input for a
PROCEDURE sound from the outside (from pleera or more with
something). I offered to put tulips -
as a standard AUDIO, stereovhoda.A to commute
tatsiyu - selector switch on
Since the more simple I did not have. I
thought that I would find the sound signals coming from
Loop CD-drive and a jumper (not to
cutting the track). And judging by the chips which could be
hope for a simplified scheme - when the magnetic
Nitol constantly "waiting for" sound coming
with the drive, and drive it off according to
"At will".

   Almost as it happened. Two signals, and
jumper saved tracks. In addition, he found
6 lapy minipereklyuchatel from the old chamber
ry.Vzyal several thin braided conduction
transitions to reduce pomeh.Reshil select a location
a nest near infrared sensor. There just
all placed, very close ...

   Drill holes, slots and secured
pursed their tails, as rested on the edge
drive. Long / gently tinkered with the Charter
vkoy switch. To fix vposleds
tvii used white glue (both sides
from the body). All neatly put together, placed
Teal marker, so as not to confuse the channels, if
will have to pay rent. Even before that, zaod
but put the key with diode isolation for
signal the presence of pitaniya.Sobral everything is a miracle
and convinced of his "natural" serviceability
competitiveness.

   It seemed a little strange weak
(Barely audible at full) the sensitivity of
input (I gave 50 Hz from M832). Such chu
vstvitelnost bit does not fit in char
acteristics entry site (this input, I pre
preliminarily reviewed the installation). Then connected
PSone and chill ... have not heard anything! In short,
same - unmatched - variant.Zapustil
to play a disc - and heard Ac
tavku, put the CD on pause - prefix
stopped, and when the disc is ejected - too
silent. Apparently, radio mutes,
until the disc is played back. Fortunately,
transition from song to song is not mute
consoles with vhoda.Parazitnoe seepage
sound at full volume out of disk - does not
ideality of the keys, it is permissible in an
parature this class.

   But at the same place (to block complex
mutation sound) more marker selector
Tel votknesh.Mozhno not put a single
switch, although the 2 pieces - unnatural
respectively / neudobno.A using the difference between constant
stant component of the general contact one
second from the nests, you can commute lock
electronically, using the closure of the nest through
Braid stereoshnura. The noise level increases
tet, but not much, it is permissible for such a technical
ki. Or, if the drive is a constant
component, switch to her absence
condition of entry. And you can leave as is -
however, without a disc signal with inputs not
listen ...

From practice: 26.03.2006 By KSA-7G