'Hi-voltage from a chip'
> The 555 is used in a voltage doubler circuit, to get over the problem
> with some serial ports of a low voltage, insufficient to meet the PIC's
> programming spec. It's nothing to do with the timing.
I learned that a 16C84 internally generates its own voltage for
programming the EEPROM. I now wonder if it is possible (and cheap) to
build a programmer for the parallel port, which generates its own
programming voltage (12-14V). If a single chip could eliminate the need
for an external power supply, it would lead to a much handier programming
Mr. Kim Runholt | Student at the Faculty of Engineering and
Finger for PGP public key. | Science at Aalborg University, Denmark
E-mail: cs.auc.dk | Homepage: runholthttp://www.cs.auc.dk/~runholt
The Charles Manning PIC16c84 programmer uses a 555 as a voltage multiplier to
generate enough voltage, from the 5 volt supply, to get 13.6 vdc for the
programming voltage. This unit is available in the US from Marlin Jones in
Florida for $39.95 USD.
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