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KISSEPROM
(Keep It Simple and Strong):
Eprom Programmer for 27Cxx Family
(and more)
and a short tutorial about Eprom

Hardware
(Power Supply Board)

Intro  Eproms  Hardware   Software

 

The power supply module gives +5v, 5/6,3v (switched through the software), and 12,5 - 21 - 25V (for programming);
I've build a separate power supply so I can use it also for other thing, other programmers etc.;
You can also use a commercial supply or your own ;
Schematics are quite simple: a transformer give 25v
rectified by the diode bridge;

SEE SCHEMATICS

now we have 3 point (going to 3 different IC):

  1. the first LM7805 (on metal dissipator) give out +5V for the base board (CD4040, transistor ecc.)

  2. the LM317 give out +12,5/21/25 V (selected through a manual switch) for eprom programming;

  3. the last 7805 give out +5/6,3V for eprom supply; in read mode TR1 (E-C) is closed and M pin of IC is directly connected to the ground; in this condition we have +5v;
    when programming TR1 is open and M pin of IC is connected to the ground through D1, D2 making the outpu higher of 1,3v (0,6-0,7V for each diode); in this condition we have  5+1,3=+6,3V output.


On the frontal panel there's a ON/OFF switch, Vpp selector , leds and a DIN socket;
Note that the box cames from a broken CD-Rom (it was Christmas holiday, so all shop closed).


SEE SCHEMATICS

 

 

Continue with KissEprom Software

73 de iz7ath, Talino Tribuzio

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