[sdiy] Genital Electric P/V converter LIVES

[mark verbos]

HB,

are you mplanning on making you findings pubic? ;)


Mark



Harry Bissell Jr wrote:

>My Gentle Electric GE-101 PV converter has come
>back from the grave. I bought it "as is but in good
>shape" from someone on AH. It was blown to kingdom
>come, probably from reverse voltage on the power
>supplies. I paid way too much for it in the condition
>received (but hey, it was 'as-is' right ???)
>
>My first clues to an amateur repair attempt was that
>ALL THE ELECTROLYTIC caps were replaced, cheap sockets
>were inserted for all the opamps (also replaced).
>
>another clue. One IC had the non inverting input
>drilled OFF CENTER to accomodate a guard ring (common
>S/H technique).  The person (dis)effecting the repair
>put in an IC socket with that pin 'folded under' so no
>connection was made. Were they going to hook it up
>later, or did they just bone it ???  I think (from the
>mass capacitor destruction) the latter...
>
>Sad is that the potted modules (2) were blown out...
>the fundamental extractor AND the expo module. Even
>the 2K Q81 tempco was toast. All the cmos chips were
>trashed, as well as a large number of transistors and
>diodes.
>
>Glad is that I was able to reverse engineer the
>modules
>with hammer, chisel, and propane torch.  I just found
>the last problem, which was a defective opamp that
>still worked, but maybe had an extrememly LOW input
>impedance due to internal damage.  Replaced it with,
>yup... a 741 and it started working. OK so 741's
>suck... but I'm fresh out of LM301s
>
>It was a lot of pain to fix this, but I wanted it for
>educational purposes. If it HAD worked, would I have
>smashed the potted modules open ???  Probably not.
>How well does it work ?  I'm not sure yet, but it does
>the P/V thing as advertised.
>
>Maybe when its in a box, I should send it to another
>Gentle Electric owner for an A/B test ???   :^P
>
>Anyway... I just wanted everyone to know there is
>life-after-talking-about-your-manhood on s-diy 
>
>H^) harry
>
>  
>