Energy #08 17 августа 1997

Железо

Metallurgy - Circuit Description C-DOS modem.

          DIENOV BROTHERS GROUP


  Circuit Description C-DOS modem

       published in ENERGY # 7.



    As is you may have noticed, in
previously published scheme were not
specified denomination details. Well, the same
Products are as follows:


    DD1 K1533LL1

    DD2 K561LN1

    DD3 K1533TM8

    DD4 K1533TM2

    DA1 K140UD6

    DA2 Comparator

    (CA3, a series, ask ARS'a)


    all diodes KD522a

    all transistors KT940a

    diode bridge KTs407a


    Denominations other parts of deliberately
fails to show that you may not repeat
knowingly glyuknutuyu scheme ...


    But glitches were as follows:


    1. There is no galvanic
junction with the line. Transformer that is,
but through a chain dialing (diode
bridge and connected to it Transistor)
common wire is connected to one computer
of wire line. As a result,
interference, walking on your computer, go to the line.
As a consequence of all this, we have errors
from connecting and problems with the ATC. If not
worse ... For example in Sec. Editor ENERGY
burnt out television and PSU
computer. Result on the person (or
pocket)?


    2. In the chip DD2 two elements
instead of inputs and outputs are grounded so
possible frequent malfunction.


    3. It is unclear what set DD4.
Judging by the scheme, it
simply duplicate the chip DD3!


    4. And, last but not least,
value, in line IS RECTANGULAR
BEEP! Which leads to its strong
distortions and, as a consequence,
additional errors.


    Do us all. Draw conclusions for yourself ...


    P.S. special for postman We certainly
to-be to develop a new scheme
free of all glitches, but worth it
modem will be about 25-30 USD Doubt
that someone will buy it. Cheaper to buy
HAYES.