[sdiy] eBay special: DOD R-870 flanger/doubler troubleshooting

[anthony]

my biggest problem is that I don't have a schematic. The circuit is only 
moderately complex though. I'm quite familiar with BBD circuitry both of the 
N-channel and P-channel type (I have lots of RD5106's and MN3007's & 
MN3006's) but I really have never messed with anything that had a compandor 
in it. (I did buy one once when I was around 12 years old, but I smashed it 
along with almost everything else in my parts bin - including a dual 
2048-stage BBD the part number of which I cannot recall but I got it on 
clearance at a Radio Shack in North Carlina in a fit of frustration. If I'd 
had the Internet back in those days... Holy Shit! seriously, I wouldn't be 
the mess I am today... God smiles on me though and good parts find me these 
days...)

Anyway I thought it could be a leaky capacitor possibly on the comandor.
The weird thing is the distortion is there when the effect is bypassed, but 
I don't think it has true bypass anyway.

I do have an account over there at diystomboxes.com.

I thought I'd post here because a lot of times you guys have a perspective 
that I find more helpful although I know a lot of you lurk there too.

Anyhoo off I go...
aa

----- Original Message ----- 
From: "Paul Perry" <pfperry at melbpc.org.au>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Monday, May 15, 2006 7:25 PM
Subject: Re: [sdiy] eBay special: DOD R-870 flanger/doubler troubleshooting


> The guys at http://www.diystompboxes.com/ will have advice, I'm sure.
>
> It certainly seems an interesting problem.
> The 'warms up' has to be a red herring (or something equally fishy) 
> because,
> nothing in one of these should run 'warm'.
> More like a cap that charges up slowly (either because it is the WRONG 
> cap,
> or because it is being charged via  wrong resistor).
> I guess you could audio probe around & try to find where the distortion
> occurs.
>
> paul perry melbourne australia
>
>