Some further tips : 1- The electro cap at the bottom should be a 10µF. 2- You need a daughter board for converting your power supply into positive ground. 3- I found that a 100K LOG pot for wah works better than 250K LIN. 4- You can use a switch instead of a pot for TIMBRE, because most of the difference in sound is at the extremes of the pot.
With AC128 I reach unity volume, all is fine. I tried with other transistors (558), and the volume was quite weak. Playing with the 2.2nF cap on the right side allows for tuning the frequency : 2.2nF is better for guitar, 4.7/6.8nF is more suited for bass.
Thank you for the layout !
ReplyDeleteHello, Isn't the electro cap at the bottom supposed to be 10µF (instead of 10nF)?
ReplyDeleteHi,
ReplyDeleteI'm glad to confirm that it works :)
You can tag it as verified !
I used AC128 Germanium capacitors (with twisted pinouts)
Some further tips :
ReplyDelete1- The electro cap at the bottom should be a 10µF.
2- You need a daughter board for converting your power supply into positive ground.
3- I found that a 100K LOG pot for wah works better than 250K LIN.
4- You can use a switch instead of a pot for TIMBRE, because most of the difference in sound is at the extremes of the pot.
This is aweseome. Thanks for tackling this and for the tips. I'll tag it and correct the 10uf cap in a couple of days when I get home.
DeleteHow is the overall output volume? 2k (or 2,2k) is quite small...
With AC128 I reach unity volume, all is fine. I tried with other transistors (558), and the volume was quite weak.
ReplyDeletePlaying with the 2.2nF cap on the right side allows for tuning the frequency : 2.2nF is better for guitar, 4.7/6.8nF is more suited for bass.