Iron - An article about the audio amplifier and a price list (for those wishing to buy a ready-amp or kit assembly).

<b>Iron</b> - An article about the audio amplifier and a price list (for those wishing to buy a ready-amp or kit assembly).

 Audio amplifiers.

music by Volga Soft
_

 The operator to trade-mail:
 (C) Nemo, St. Petersburg, PO Box 213

Firm Zvukotronika "(St. Petersburg) offers
To your attention two of the most popular among
Spektrumistov St. Petersburg amplifier
Embedded computers in Spectrum. This
Low Voltage 2 X 2W (+5 V) and a more powerful
 X 22W (+12 V).

 Amplifier 2 X 2W



 This amplifier has several
very useful qualities that distinguish
it from many other amplifiers such
class.

Advantage No 1: This amplifier is not
requires a heat sink (radiator), which is explained by very 
high efficiency are used chips (they almost do not scatter

heat, and all the energy from the power source
give the load with almost no losses).

Advantage No 2: A very small current consumption from the power 
source - in no signal at all 12.15

mA (for comparison: power on two UN14
consumes - 60.80mA). This high cost makes this amplifier
indispensable in a portable small-sized
stereo equipment. After all, everyone wants
to a tape played on batteries as
possible!

Advantage No 3: Bridging the inclusion
load. This means that this amplifier
may give more power to the load at low voltage (+3 V,
+4.5 V, +6 V). It is very important because
any power (no bridge) has a
low power low power. For example,
when powered +6 V at 8 ohms only
0,5 W (UN14, TDA2005, etc.), but this amp in the same 
conditions gives a load four times: 2 W! 

The advantage of No 4: extremely low
supply voltage (lower bound) of all: +1,8 V! This means that 
this amplifier You can feed the same voltage as the

Player (+3 V), and power in this case is 2 X 0,75 W (4 ohms).

 From the foregoing it can be done
Conclusion: This amp is designed to
use in a portable small-sized
equipment, where important efficiency and
power (at a low-voltage power supply).

 AMPLIFIER 2 X 22W

 This amplifier is designed to increase the output power car 
stereos, having a small output power (3.5W per channel). Due to 
its small size power can be easily integrated into most 
stereos. With such an additional amplifier can be

to upgrade their tape recorder. If,
For example, it has a capacity of 2 X
20.25W, then the installation of such an amplifier
allows you to output the sound to one more
a pair of columns (for example, embedded in
door).

Recommended use:

 1) The signal at the amplifier output can be fed with a linear 
output AY 8910 or shoot the signal output from the motherboard 
GENERAL SOUND. You can also remove the signal output from the 
speakers. Resistors (R '), drawn on dotted pattern, in order to 
extinguish signal (TDA1557 chip is very sensitive, high-gain). 
Their nominal should be: 20 .. 50 k, if the inputs

signal with an amplitude of about
-250mV.

 2) Power required to install
on the heat sink (not less than 80 cm ^ 2).

 3) To maintain the dynamic power
amplifier is useful to include parallel
Nutrition (from +12 to ground) electrolytic 
kondensatorbolshoyemkosti 2200.4700 mF x 16V then the power 
will not squander the passage of the peaks maximum power.


 PROHIBITED:
 Changing food "+" to "-" and close outs at +12 V, the mass, as 
well as each other in any sequence.



  Table 1

Abbreviations:
Goat. - Finished product.
fee - "Nude" fees.
Emb. - A set of self-assembly.
s.MS - Cost of M / s.

All prices are quoted in rubles.
'

  AMPLIFIERS TERMINALS:

 Item Type M / goth. Board nab. s.MS

- The voltage pit. Upow. = +6. +12 V
b
u 1W 174UN4 February 6 February 5
e
g 4,5 W UN7 Sept. 2 on May 7
about

  7W UN14 Feb. 11 on July 8
n
and 12 10W TDA2003 2 September 1910
h
by 2 x 7W UN14 x2 22 March 17, 1917
and
h 2 x 10W TDA2005 25 March 20, 1916
.

H voltage pit. Upow. = +2. +6 V
and
is 1W + 1W KA2209 16/19 2 Aug. 16
in
about 2W KA2209 15 2 12 8
l
+ 2 X 2W KA2209 25 March 20, 1916
m x 2
.

and stresses the pit. Upow. = +12.15 V
in
t 2 X 11W TDA15 February 28 - 20
about 19A
m 1 X 22W TDA15 28 February 22, 1920
about 19A
b 2 X 22W TDA1557 50 3 44 35
and
l 4 X 22W TDA1557 78 6 - 70
L x 2
by 1 X 30 TDA2005 25 April 20, 1916
s
e 1 X 55W TDA1560 73 8 63 50


H for example. supply is +12 V (Upow>> 12V)
I

  25W TDA2030 20 March 15, 1910


  2 x 25W TDA2030 1935 April 30, 1920
F
I 50W TDA2050 1935 April 30, 1920

to 2 x 50W TDA2050 60 5 50 40
l X 2
and 2 x 30W TDA1521 40 4 34 30
with
with 75W TDA15 50 4 45 40
and 14A

  2 x 75W TDA15 98 8 90 80

     14A x2

  100W no M / C 40 8 35 -


  2 x100W no M / C 98 16 80 -


  2 x140W no M / C 105 16 85 -


  200W no M / C 98 16 80 -


to c preamplifier.
about
m
b head
and 1W + 1W KA2209 May 30, 1925 8
n
and
p head
about 10W TDA2003 30 May 25, 1910
in
and with
Mr. Head
n 2 x 10W 3 IC 45 8 35 25
s
e with

  head

  2 x 20W 5 IC 60 10 45 45



   INDICATORS



  8u

  Diode A277 24 May 18, 1912


  12I

  Diode A277 28 May 23, 1912


  12I

  Diode

  (Mini) A277 30 May 23, 1912



       Spectrum


  in the collection of 170 / - - -

       160 /

       140


  pay 35 October 1910


  Indica
  torus June 20, 1915



   PRE AMPLIFIERS


c on

  157UL1 157UL1 March 20, 1915 5
r
about to
l TA8119 TA8119 February 20, 1915 8
o (for

   in pleyek pa) 20
and tone controls, volume and

     Balance


c Pre-amplifiers (EQ

   with volume control and balance)
l

   and 2 Mon gloss
e mono 157UD 25 April - 1
th

   n 2 VET gloss
Mr. stereo 157UD2 50 7 40 1
about

     3 types gloss
s Equal. 157UD2 55 7 45 1
x

   5i on a shiny
and Equal. VA3822 65 12 55 10


     6n for
  gloss

  Equal. VA3822 70 12 60 10



     WAGES OF SPECIAL PURPOSE


mic amp. - 20 February 1916 -


   megaphone
10 TDA2003 May 30 - -
20 TDA2003 40 5 - -

     x 2

Squelch K157HP3 May 20, 1916 5


   converter

   (Doubler) voltage
to squelch
9V> 18V 561IE7 15 2 - 0.5


   matching
usil.1: 20

   converter 157UD2 15 3 15 1

12V> E35V

  (3A) 150 -

Filter
Car

  Inagr .= 1A 6 -
Inagr .= 6A 25 -



 Terms of e-mailing amps through the company (c) Nemo.
 1. Choose your amplifier
(Either the finished product, or fee, or a set of 
self-assembly, or IC) from Table 1, multiply the price of the 
amplifier to the desired number (pieces) and add a price list 
(30t.r.). Price distribution does not depend on order value.


 Example: You want to order one ready
amplifier 2 X 2W (as an example) and
three ICs (on which he is going - to
Build on the prototyping board from its own
details on site). Then the price for the purchase by mail 
(which includes the cost of shipping to you, that is, when 
receiving do not have to pay!) will be:

 25t.r. 3 pcs * 16t.r. 30 TR = 125t.r.
 2. Transfer money postal order
at that address.
 3. Attention! Prices are valid for two months from the date of 
publication Journal "ZX-FORMAT" No.7! At the end of

this term should order a new
price list.
 4. Execution period (reference) order with
receipt of money - 14 calendar
days.

P.S. Suggested amps you can use at home as a booster, car, 
equipment discos.