Hi guys. It's okay to have 3v at pin 3 of a Zendrive op amp? The pedal sounds good, but I'm not that impressed. I hear some unpleasant fizzy decay in the distorsion that I'm not sure if other units/builds have
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Layout used:
http://tagboardeffects.blogspot.com.es/2012/01/hermida-zendrive.htmlOp-amp1 - 4.8v 8 - 9.4v (new battery)
2 - 4.8v 7 - 4.8v
3 - 3.3v 6 - 4.8v
4 - 0v 5 - 4.7v
Q1S - 4.5v
G - 4.85v
D - 4.85v
Q2S - 4.75v
G - 4.8v
D - 4.8v
On the bottom lug of the 470k resistor that goes to pin 3 of the op-amp my tester reads 4.75v, but after this resistor the voltage drops to 3.3v.
I've used the same components as shown in the layout except
1N34A diode for D3, and multilayer ceramic cap instead of ceramic cap. Tried different op-amps and mosfets.
BS170 seem to work better and help with the fizziness in the decay that I've mentioned above.
I have to say that I put backwards the
power filter cap (100uf), and to my surprise it didn't explode...Although the pedal was working fine I changed the cap for a new one and also repaced the other electro, just in case. Could that have fried another cap?
I've checked multiple times all components values, positions, links and cuts. At that point I don't know if it's just how the pedal sounds or what
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Any help will be very welcome :)