Nicron #26 27 марта 1997

Железо     Доработки

Soldering Iron - LPT COVOX.

                         LPT COVOX


(C) KEX

 I welcome all readers NICRON'a! If you do
there is no such thing as COVOX, then immediately, take in hand 
soldering and Forward! Below is a scheme COVOX'a. Do not worry 
nothing terrible here. By the way, this scheme has already been 
published in Newspaper ZX-MAGAZIN. You probably already know a 
similar scheme for resistors, but this scheme has several 
advantages: 1). Small size (no need to solder a bunch of 
resistors) 2). Small cost (1000-1500 rubles. Mitino)

Disadvantage: the additional power +5 V
Thus, the scheme COVOX'a made on the basis chip KR 572 PA 1:



                        November 1915 at

             ST0 power

                        10,240 th

             ST1

                        9

             ST2 K

                        8 P

             ST3

                        May 7

             ST4 7

                        June 2

             ST5

                        5 P

             ST6 A

                        4

             ST7 1

                        12

          STROBE

                        1

             +5 V

                        2

             gen.


Signals given to the legs of chips KR 572 PA 1 ∙:



  Number of legs Alert


      1 +5 at.


      2 gen.


      3 gen.


      4 D7


      5 D6


      6 D5


      7 D4


      8 D3


      9 D2


      10 D1


      11 D0


      12 STROBE


      13 total.


      14 +5.


      15 Exit


      16 No


The whole thing fasten to printer output. Imprint
taken from the chip KR 1533 IR 23. Exit music can be sent
one of two internal amplifiers kanalov.Esli you still have some 
problems connecting COVOX'a, please call. 

                        Andrew (KEX)
                    497-74-66 21:00-00:00
                      ZX-NET: 095/462.6