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'[PIC]: Designing New PIC Programmer *Updated*'
2003\02\01@161336 by Stephen

picon face
After lots of Trail and error using a circuit Sim, I designed a proper power
switch for VPP. I have yet to implement it on my prototype, but it looks
good.
The new schematic can be viewed at: http://qwertys.hypermart.net/Mypic.png


If anyone could help with the design it would be appreciated. I have the
circuit built and tested right next to me. All the voltages seem to be
normal, its just that I cant seem to program or read. I think it might be
propagation delays, but I cant find any software that lets me adjust for
that.
Before this, I built the PonyProg but had to modify it for lack of 13v
zener, and that circuit didn't work either.

This programmer uses the Serial port, not the parallel port.

The PIC (PIC16C622-20/P) Is there for reference only. The PICs that I am
attempting to use are the PIC 16F627 and 16F628. (I believe it is the same
pinout though)

The middle part which has 10 "Port" is actually a Header/Connector. This is
maintaining compatibility with the PonyProg programmer in pinout (with
exception of the inverted pins). With this method I can add new sockets for
EEPROMS and other PICs.

{Original Message removed}

2003\02\01@180328 by Olin Lathrop

face picon face
> The new schematic can be viewed at:
http://qwertys.hypermart.net/Mypic.png
>
>
> If anyone could help with the design it would be appreciated.

I'm not quite sure what you intended, but Q2 isn't right.  You aren't
going to source any current out or the emitter or a PNP transistor without
abusing it.


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2003\02\01@212536 by Stephen

picon face
Thanks for catching that mistake.
Luckily I havn't built that part of the circuit yet. I'll try to get it done
by next week, and I'll have an updated schematic soon.
Does anyone know where I can find LIF Sockets? I was lucky to find a few at
the unlocal electronics shop, but I still need a few other sizes (LIF = Low
Insertion Force, they are like normal DIP Sockets but are designed for
easier to take parts in-out)

-Steve
{Original Message removed}

2003\02\02@155109 by Tony Nixon

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picon face
Stephen wrote:
>
> After lots of Trail and error using a circuit Sim, I designed a proper power
> switch for VPP. I have yet to implement it on my prototype, but it looks
> good.

Try keeping OCS1 grounded as well.

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Best regards

Tony

mICros
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