[sdiy] paia ring mod

[Peter Grenader]

Two things to try:

One, what is the recommended power requirement for the unit?  Me thinks it
not 10.5.  Whatever it is, this is what you should be using.  Secondly, just
for fun, look to see if there's an electrolytic cap in backwards.  This
working for a while and crapping out seems electrolytical (if that's a
word).  This is what happened with my first Blacet osc.  worked fine - for
about 20 seconds, then a little wiggle of freq and  bye bye  until i
re-powered it.


tuj wrote:

> 
> Hi all:
> 
> I recently assembled a Paia ring modulator kit.  This being my first kit,
> there is of course, a problem.  The unit works fine for about 3 or 4
> minutes, then the effect disappears and only the dry signal is passed
> through.  The effect seems to disappear faster if the frequency knob is
> turned (direction doesn't seem to matter).  The effect will return if the
> power is increased slightly, only to disappear after another 3 or 4
> minutes.  I assume the problem lies somewhere in the power supply or
> grounding of the unit.  I am testing it from a regulated bipolar supply
> using roughly 10.5 volts at about 200 mA.  The ground on the unit is
> connected to the ground on the power supply.
> 
> I'd be very interested to know if someone has run into a problem like this,
> and how they solved it, or at least what to look for.  Thanks in advance.
> 
> -tuj
> 
>