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Re: Custom Echoplex switching pedals...any interest?



helpful tips from Matthias:

>X-POP3-Rcpt: kflint@rosy.yourwebhost.com
>X-Sender: matthias@pop3.bahianet.com.br (Unverified)
>Mime-Version: 1.0
>Date: Wed, 24 Mar 1999 17:57:14 -0300
>To: kflint@annihilist.com
>From: Matthias Grob <matthias@grob.org>
>Subject: Re: Custom Echoplex switching pedals...any interest?
>
>>At 8:24 AM -0800 3/22/99, Chris Chovit <cho@newdream.net> wrote:
>>>You can use mutiple footpedals to control one EDP, but uou can't use one
>>>footpedal to control more than one EDP at a time. (Unless you use the 
>DPDT
>>>switches, as Claude suggested, to keep the circuits separate.)
>>
>>Matthias modified an echoplex pedal to work this way. It's pretty simple,
>>just use an opamp to buffer the voltage to the other units. Perhaps he
>>could explain for you guys.
>
>Yes, gladly: It works reasonably with the voltage buffer. If fact I made
>one for the keys and another for the FB foot controler.
>I use a 3 pos. switch to control either one or the other or both Plexes.
>
>One disadvantage is that the keys on the front pannel do not work any 
>more.
>
>Another disadvantage is that the control of both units is of limited use,
>because they do not necessarily stay synced. I think it depends on the
>phase of the software running in each machine (exact moment of power on, 
>in
>micoseconds). I did not find a solution for this.
>So now I use MIDI if I want them in stereo and set the Pedals for the 
>master.
>If I want to use the units like two tracks, I disable MIDI on one of the
>units (ControlSource parameter) and select the "track" with the switch.
>Basically, you can do without the said preamplification. The only 
>advantage
>of the buffer is that I can control Mute on both "tracks" or fade them out
>simultaneously. Record is not recommended for the mentioned sync problem
>and the other functions probably do not make sense on two tracks, do they?
>
>The buffer is an OpAmp with the output tied to the inverted input and the
>Footswithes connected to the non inverted input with a resistor of 4k7 to
>+5V.
>For the FB pedal I connected my fader between 0 and +5V and the slider
>plain to the non inverted input. It should also work connecting just two
>pins (low end to ground/slider to non inverted), while adding a resistor 
>of
>about 3k9 (adjust for the pedal range) to +5V.
>
>Happy soldering
>Matthias
>

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Kim Flint                   | Looper's Delight
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