TargeT #08 01 февраля 2001

Железо

Iron - Connect music channels soprotsesora AY / YM to the amplifier.

           ZX-UPGRADE



   Connecting channels muses.

   soprotsesora to the amplifier.



        Written by VIC



  There has recently raised the question of
connected to the amplifier
Music soprotsesora
AY-3-8910/12, or analog
YM-2149F. Well, I decided
make a contribution. We look at
scheme (Fig. 1). All of these resistors
Need to get sound
stereo. In other words
of 3-O (ABC) have
get two choices. Now
understand with denominations
resistors. R1, R4 - 1 k; R2,
R3 - 2 k; R5, R6 - 3 kOhm.
Why so? It's very simple.
It is only necessary that razobratsya
it makes each resistor.
R1, R2, R3, R4 - restricting
resistors. They limit the power
current of the curves. ABC. If these
resistors is not something external
devices connected to danym
outputs (ABC) music
soprotsesora overload them.
Usually in such cases include
consistently to the exits,
resistors 1 - 3
ohms. Which is done (R1, R4).
R2, R3 - twice more than
R1, R4. Because vyh.B
included in both the left and in the
right channels. Hence
efforts will be doubled. A
For example, the output of A is included
Only the left channel and enhanced
will be only once. Therefore,
, Dany byhod B, should be
ease for each channel (as
to the left and on the right) in
two raza.Chto and made R2 = 2 * R1,
R3 = 2 * R4. R5, R6 -
normiruyushie resistors. They
(These resistors R5, R6) are needed to
to outputs (left and
right) voltage were
chapels 250 - 500 mV. Why
250 - 500 mV? Because the adopted
such a standard - at the input
amplifier signal
V 250 - 500 mV. Well
Here at Dana scheme and all.
It only remains to add that
similar connection scheme
Music channels soprotsesora
used in the scheme PENTAGONa.



             R1
AY

     A <1


             R2 R5


                             <2


     B R3


                             <3


             R4 R6


     C



          Figure 1


1.Vyhod left
2.Zemlya (screen)
3.Vyhod pryavy

P.S.
Do not judge strictly for the possible
spelling and punctuation
errors.

11.01.2000 VIC

FOX>


    Yes, these errors we have something
correct, the main circuit to
worked :-)