Hello everyone!
I recently finished the Bogner Pre-Amp predal after alot of work and troubles.
http://tagboardeffects.blogspot.nl/2014/06/black-forest-bogner-uberschall-sim.html
So I have sound and thats awesome! But it's very low gain even when the pot is turned all the way up :(
Here is the data:
Used this video to measure voltage drop of Diodes
https://www.youtube.com/watch?v=gzh8ICLMXzQ
Pictures of the board:
https://imgur.com/a/VGk70
Schematic:
http://tagboardeffects.blogspot.nl/2014/06/black-forest-bogner-uberschall-sim.html
I'm by no means an expert in this and this is actually my 3th build ever.
I changed the J201 to 2n5457 and they had a substantial amount more gain but I didn't like their tone alot.
Could my batch of J201 just be faulty?
D1 @0.25v
D2 @0.25v
D3 @0.25v
power in = 8.6V
board in = 8.6v
Q1
drain = 4.86v
source = 0.78v
gate = 0.00v
Q2
drain = 4.90v
source = 0.82v
gate = 0.00v
Q3
drain = 4.94v
source = 0.85v
gate = 0.02v
Q4
drain = 4.96v
source = 0.57v
gate = 0.05v
Q5
drain = 8.40v
source = 5.70v
gate = 5.14v
Diodes measured at black line
D1 = 0.82v
D2 = 0.81v
D3 = 0.57v
Shameless self bump :(