[sdiy] CVs to an old Radioshack Reverb

[Happy Harry]

Ahhh most excellent.

You have then discovered the "noise ceiling"...

May your audio be "obscurred by clouds"

H^) hary




>From: <tpaddock at seanet.com>
>To: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] CVs to an old Radioshack Reverb
>Date: Tue, 16 Oct 2001 15:01:42 US/Pacific
>
>I have the schematic for the mono Mighty Radio Shack Reverb
>around here somewhere.
>I don't know how close it is to what you have. It uses a
>MN3207 BBD and MN3102 clock. On it, I think at least one
>slider (delay time?) is a variable resistor that I want to
>replace with a photocell. On mine, I broke the dry signal
>path to make it delay only. (was my first music gear mod)
>
>Harry? I've got 8 more of them. And I'm going cut their
>dry paths. And I'm going to patch them all in a circle!
>All in a circle, Harry, feeding on each other's evil!
>Distortion! Aliasing! Evil! Noise floor through the
>roof! MWAAAAHAAAAHAAA!
>
>http://www.seanet.com/~tpaddock/images/rs_rev_logo_sm.jpg
>
>Thank you,
>  - -- -  Toby Paddock
>
> > Hi Kris....
> >
> > Watch it... knobs are not "just" voltage dividers. They are only
> > voltage dividers in circuits where you already have voltage control
> > built in.
> >
> > Sometimes they are variable resistances... sometimes AC voltage
> > dividers...
> >
> > Usually you CANNOT as a rule, insert voltages where potentiometers
> > were. You need to understand the circuit.
> >
> > BTW.... Its a BBD circuit so I shouldn't help you NOT BREAK it.. ;^P
> >
> > But I have mercy on the DIY folk. Nobody likes to break things even
> > if they do SUCK.
> >
> > Try and see if Radio Shack can still provide a service manual, etc.
> >
> > Ask Paul Schreiber of synthtech.com, He a Radio Shack alumni...
> >
> > If not you need to trace the schematic from the PCB and get data
> > sheets for the devices. Then we can help you make it VC.
> >
> > If they are single variable resistors, you could use photoconductive
> > cells. If they are really pots... it could be harder but is still
> > possible.
> >
> > H^)hary
> >
> >
> > >From: "Rhen, Kris" <krhen at stucki.com>
> > >To: synth-diy at dropmix.xs4all.nl
> > >Subject: [sdiy] CVs to an old Radioshack Reverb
> > >Date: Tue, 16 Oct 2001 13:15:38 -0400
> > >
> > >Hi all, found something this weekend.  Used to have an old
> > >Radioshack/Realistic reverb a looooong looooong time ago and had lost 
>it.
> > >My parents were having a garage sale this past weekend and we stopped 
>by,
> > >and what did I find sitting on a table for $1??? My reverb!!!  After
> > >chastising my father pretty severely :-) brought it home and decided to
> > >stick it in a module (replace the RCA jacks with minis, get rid of all 
>the
> > >extra stuff like tape monitoring circuitry etc).  One thing I want to 
>do is
> > >put CV points around the knobs for dept, delay and mix.  I also want to 
>do
> > >some similar mods to some of my modules (adding res CVs around the res
> > >knobs
> > >where there are none etc.) so I thought this would be a quick and easy 
>-
> > >who-cares-if-I-break-it trial.
> > >
> > >I realize the knobs are just voltage dividers, so putting a voltage 
>across
> > >the knob leads should accomplish the same task, with switching jacks to
> > >break the knob paths?  I'm sure there must be more to it, so any 
>guidance
> > >is
> > >appreciated.  Thanks all
> > >KRIS
> > >
> > >p.s. anyone know what's in this thing?  There's hardly any ICs at all.  
>Its
> > >model 42-2108 Stereo Reverb System.
> > >
> > >
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