Farfisa Wha-Wha/Volume

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
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bm13
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Post by bm13 »

Hi,
a friend gave me a Farfisa Wha-Wha/Volume pedal. The battery leaked (probably some decades ago) and destroyed part of the backplate.
I replaced the battery snap, checked the wires and now it seems intact. But so far I just got a really really quiet sound out of it.
Does anybody has a schematic or some informations about it?

It seems to be the predecessor of the Maestro Wah-Wah/Volume Pedal but I didn't found a schematic.
Those Maestro Pedals seem to acquire high prices on ebay, but the only Farfisa unit I found was sold for some bucks.
'Really glad if somebody could help me.

bm13

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tube-exorcist
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Post by tube-exorcist »

So you have this pedal.... not working.... but yo have the pedal.

Why don´t you take some pictures from the inside, the component side of the pcb and the track side of the pcb and post it here ? Maybe someone will trace it and draw a schematic.... But without any pictures your chances ar much worse.
"I've noticed there's an inverse relationship between cost of gear and talent. If you need the most expensive gear to get decent tones, then you suck as a player."

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Desdog
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Post by Desdog »

google already gots some
Attachments
components side 2
components side 2
mvsnm4rqlpzd80mvjdm1.jpg (44.52 KiB) Viewed 1552 times
components side 1
components side 1
dsz8xqsdfqt2kh572cgw.jpg (42.6 KiB) Viewed 1552 times
front
front
ssdt46snuvz0dvfjogzw.jpg (42.66 KiB) Viewed 1552 times
top
top
vrjkor9n9bin2fqzcvp8.jpg (42.51 KiB) Viewed 1552 times
bottom plate
bottom plate
hkdqpktjv2grhnp4bdsr.jpg (35.17 KiB) Viewed 1552 times

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tube-exorcist
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Post by tube-exorcist »

[quote=Desdog]
google already gots some
[/quote]
Nice..... but I can´t see a track/solder side .... which is important for tracing....
"I've noticed there's an inverse relationship between cost of gear and talent. If you need the most expensive gear to get decent tones, then you suck as a player."

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bm13
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Post by bm13 »

Ok. I took some photos and tried to trace it.
Looks like a simple wah circuit to me.
I'm not sure what the correct values of the three capacitors are.
The pot is a dual pot, but so far I don't know the specs.
The 560K resistor looks a little bit suspicious.

Unfortunately I can't upload files here at the moment, so here are the imgur links:
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bm13
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Post by bm13 »

Once again...
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