[sdiy] Realistic Stereo Reverb System Model No. 42-2108

[Doug Terrebonne]

Some mods (originally got these from Greg Zifcak I think) - 

C22, VR2 and R30 control the delay time, so make C22 way bigger and you'll get 
way longer delay. this will also make the minimum delay longer, so make R30 
smaller while you're at it. i also put a bigger pot in line with VR2, so that 
i'd have a coarse delay time and fine delay time, for those nice audio rate 
resonant screeches. beware, once you make the delay times longer, the clock dips 
down into the audio range, and it's a pretty loud whine. just adds to the 
ambience though. if you're familiar with eats tapes, it's all over almost every 
track.

R20 controls the feedback amount. i replaced it with something like 15k, so it 
just goes into self oscillation toward the top of the repeat slider.

i also added a switch to cut the dry signal from the output, nice for super 
crunchy rate reduction of the input signal courtesy of the bbd. i also rerouted 
some stuff so the 1/4" jacks are the ins and outs, and the mic preamp can 
seriously distort any input signal.




----- Original Message ----
> From: aankrom <aankrom at bluemarble.net>
> To: Todd Sines <sines_list at scale.gs>
> Cc: synth-diy at dropmix.xs4all.nl
> Sent: Fri, December 16, 2011 8:42:54 PM
> Subject: Re: [sdiy] Realistic Stereo Reverb System Model No. 42-2108
> 
> I'll photoshop up my schematic with mods. A lot of it had to with making the  
>unit less noisy and better caps & stuff. Oh and easier  self-oscillation.
> 
> AA
> 
> On Fri, 16 Dec 2011 19:57:37 -0500, Todd  Sines wrote:
> > Mind showing us or documenting your mods with... how-tos?  Would love
> > to tweak mine a bit as well. It just kind of sits there  now.
> > 
> > Sorry I don't have a schematic. :P
> > 
> >  Thx,
> > 
> > 
> > +odd
> > --
> > On Dec 16, 2011, at 6:05  PM, aankrom wrote:
> > 
> >> Hi,
> >> The Realistic Stereo  Reverb System Model No. 42-2108:
> >> Anyone ever crack one of these  open? Or have a schematic? I have the little 
>black 32-110 "reverb" with the  sliders that I have heavily modified and use as 
>an effect/instrument. Super fun  for what it is and I managed to get one for 
>cheap. I think my favorite mod was  swapping in a BL3208A - makes it /almost/ 
>like a tape echo machine. Still, I  wanted another one and all I'm finding on 
>eBay are the silver units that seem to  have been designed for use with a stereo 
>hi-fi (hee) system. So... back to my  query... I need an end of semester eBay 
>fix...
> >> 
> >>  AA
> >> _______________________________________________
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> >> Synth-diy at dropmix.xs4all.nl
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