ZX Ferrum #02 26 апреля 2004

Железо

Zhlezeo - Cheap stereosilitel on two chips.

                           Amplifier.

(C) 2004 Demon / Diman Plus Company


  This article is for those who are tired pull over
Speccy old tape recorder or something having power, or for
those who want to hear stereo sound on the Spectrum and so on 
and so n. It is a simple, cheap stereosilitel on two chips 
(total cost in the range of 30 rubles). And most importantly, I 
threw up fee that can be cut out for an hour or corrode, its 
image is attached to the 6912 format. Ibid there is a scheme 
which I have duplicates, the LRA would you not think that there 
is cat in a bag. 


             ________________________________

            /

                           DA1


                                                  +

             C2> exit

                                                + C9
input C1
 <R1 C8 C7

         +

            C4> +12 v

       R2 +

                       C3 + +

                                C6 C10 C5
 <> GND
GND


                       Scheme 1 One-channel


                 A list of components in Figure 1.

DA1 - KA2212, or 7112 or 7312 (if the market take guys know 
analogues). 

C1 - 4.7 microns
C2 - 101 pc
C3 - 4.7 microns
C4 - 502 pc
C5 - 104 pc
C6 - 47 microns
C7 - 47 microns
C8 - 103 pc
C9 - 470 microns
C10 - 101 pc

R1, R2 - 220

C5, C8, C10 can take one denomination, for example 101.
C2 - his selection can regulate the amount of treble
depends on the chip, I determined at the hearing.


  The amplifier like this:


         signal>



               10k <> Amplifier

                       220


                >>


  You can of course and without rezyuka to 220 ohms, but then 
the sound of the regulator can not be removed completely, you 
will hear a sharp whistle. 

  Power amplifier I have not measured, but the order of 3 watts 
should be.