Searching \ for '[OT} DAC for device programmer.' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: techref.massmind.org/techref/microchip/devprogs.htm?key=programmer
Search entire site for: 'DAC for device programmer.'.

Exact match. Not showing close matches.
PICList Thread
'[OT} DAC for device programmer.'
1998\07\12@073657 by Frans Gunawan

flavicon
face
Does anyone have experience with interfacing DAC to 30Volt, 100mA, with
good load regulation?
The DAC is used for device programmer and I choose DAC0830. Any idea for
op-amp, power op-amp, transistor, fet, etc?
Thanks
http://www.poboxes.com/f
f

1998\07\12@102953 by Alan King

picon face
Frans Gunawan wrote:
>
> Does anyone have experience with interfacing DAC to 30Volt, 100mA, with
> good load regulation?
> The DAC is used for device programmer and I choose DAC0830. Any idea for
> op-amp, power op-amp, transistor, fet, etc?
> Thanks
> http://www.poboxes.com/f
> f

 I'm looking at DAC out to opamp to give right voltage swing and into
the adj pin on a LM317.  Still need the resistor from output back into
adj, and then just to output of amp instead of through resistor to
ground..   Output should be 1.2v above whatever is coming from DAC/OpAmp
combo and have plenty of current..  Wait'll you see the super cheap
really universal programmer / ic tester I'm working on..  PIC
controlled, of course..  Sould be <$250 to sell, maybe <$200 and
definitely not the $495 plus most really universal programmers are..

Alan

Alan

1998\07\12@145537 by wouter van ooijen

picon face
>   I'm looking at DAC out to opamp to give right voltage swing and into
> the adj pin on a LM317.  Still need the resistor from output back into

I did something like that in my WISP programmer (
http://www.xs4all.nl/~wf/wouter/wisp ): 4 16x84 outputs via 4 different R's
to the mid of the two lower Rs on the 317 (take a look at the schematics).
I tried to calculate the 317's output voltage for each of the 4^3 settings,
but this was beyond my math and too sensistive to very small variations in
the R's. Instead I just stored the calibration data in the 16x84 which
controls the whole thing. Result: much cheaper than using a real DAC, but a
calibration is needed (of couse you could automate that).

regards,
Wouter.

More... (looser matching)
- Last day of these posts
- In 1998 , 1999 only
- Today
- New search...