Digital Delay w/a mind of its own...

[Goddard, Duncan]

not getting warm, is it? check that you're not over-feeding the regulators
in it's psu. I've had american gear that was designed to run on 110 or 220
get upset by 240 because the regulators (78xx etc) couldn't throw away
enough of the volts coming out of the bridge; they overheat and shut down
for a while.
only other thing I can think of is this: a few years ago, I noticed that my
walkman (a nat-pan, now long-dead) would work fine in the house but after
I'd set off for work- like, 100 yards down my road, speed stability
problems. eventually I pulled it apart and found a quantity of london's
unbreathable atmosphere deposited across the pcb. what I surmised was that
going outside into damp air was "livening up" this contaminant into an
electrically effective state. maybe I've discovered a new way to make
semiconductors....... once cleaned off, the walkman worked fine. then I
trashed it.....

duncan.

> ----------
> From: 	Lewis Bupp II[SMTP:biglu1118 at earthlink.net]
> Sent: 	04 August 2000 15:09
> To: 	synth-diy at node12b53.a2000.nl; oldsynth at egroups.com; WeAreAs1 at aol.com
> Subject: 	Digital Delay w/a mind of its own...
> 
> OK! Can someone tell me if they ever experienced this and if they have,
> how did you correct it. I have  Yamaha Digital Delay D1500. It is housed
> in a wooden rack unit along with some Paia stuff, a Midiverb, a patch
> panel and a power distribution strip.
> This is the 2nd time this thing has doen this. It will work for a few
> days, then suddenly stop processing. If I take it out of the rack and
> take the top off, it begins to work. Whats goin on here? It doesnt
> appear to be pinching any wires and no componenets are touching the top
> cover. I have 12v Power supply  from  Paia and a 15v power supply from
> an old arp omni. Is it possible that the transformers are producing
> enough emf to affect the circuitry? I'd  like some input on this. thanks
> .
> 
> Lew
> 


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