ETI/Powertran/Elrad vocoder

[Hallvard Tangeraas]

At 21:26 +0100  10-06-2000, Magnus Danielson wrote:


>From: Hallvard Tangeraas <hall at oslo.online.no>

>> Anyone built the Powertran/ETI/Elrad vocoder?
  [...]
>> Anyway, I'm in the process of building one of these, but could need
>> some pointers with certain details I'm confused about, so I'd like to
>> get in touch with someone who's successfully built one.
>
>OK, now that you found your way over here... what's your trouble?
>I am sure that me, Anders and Juergen should be able to solve it...

Thanks. Nice to be back (after spending a few months trying to figure
out how to get on the list again, since the old list is apparently
still working, but isn't in use, which makes it all more confusing!).

The vocoder....
It's been one of those "eternal" projects which I'm finally getting back to.
It's nice that it's built in "modules" as I can check one and one part
before I fry everything. Actually, all the parts are completed, but I
never got the input amplifiers to work.
There's something weird with the circuits -as far as I can remember
there was some confusion about the placement of the pots (there were
some extra connection points, which made it very strange).

Since I soldered/desoldered test wires and the pots, never getting it
to work, the PCBs have become pretty ugly and damaged, so I've made new
PCBs and I'm ready to start again. This time I don't want to make any
mistakes.

How should we do this?
I don't have a scanner, but a friend of mine does, and I could scan the
circuit diagram/PCB layout for those input amps, and make them
available on a web page of mine, then we can take it from there.
And perhaps I should just get my equipment out of the closet and start
building those PCBs again... any other suggestions?

If any of you remember any specific problems/confusion regarding those
input amps, I'd be interested in hearing about them, but it might be
easier to follow circuit diagrams, then compare with a completed,
working vocoder.

Hallvard
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