I have not seen a Basstortion schematic yet but if you would like more low end the coupling and input capacitors is a good start to tinker with. 100nF is input cap, try 220nF there. Coupling caps is 22nF and you could increase them to maybe 100nF or so. The ones I have in mind the one connecting to Drain of Q1 and another one connecting to G of Q3. You could also tinker with the RC filter which is the 470k/470pF. Enlarge cap and reduce resistor value for more bottom end....although this filter gives the pedal its signature Marshall-in-a-box sound and feel.
There's an error here on the hi/lo switch – it just breaks connection to ground, instead of paralleling a connection to ground in order to short the 330Ω resistor on the Source of Q3
An easy fix is to: 1) move the north 330Ω leg (on row B) and connect to ground at row A 2) remove Hi/Lo Sw1 from row B and connect to row E
This now shorts the 330Ω when switched, giving it the two gain settings. Otherwise, this circuit is verified and sounds fantastic!
Any ideas on how to make this like the Basstortion?
ReplyDeleteI have not seen a Basstortion schematic yet but if you would like more low end the coupling and input capacitors is a good start to tinker with. 100nF is input cap, try 220nF there. Coupling caps is 22nF and you could increase them to maybe 100nF or so. The ones I have in mind the one connecting to Drain of Q1 and another one connecting to G of Q3. You could also tinker with the RC filter which is the 470k/470pF. Enlarge cap and reduce resistor value for more bottom end....although this filter gives the pedal its signature Marshall-in-a-box sound and feel.
DeleteCan i use 2n7000 mosfet instead of bs170?
ReplyDeleteMind the pinouts. You probably have to reverse them.
DeleteThere's an error here on the hi/lo switch – it just breaks connection to ground, instead of paralleling a connection to ground in order to short the 330Ω resistor on the Source of Q3
ReplyDeleteAn easy fix is to:
1) move the north 330Ω leg (on row B) and connect to ground at row A
2) remove Hi/Lo Sw1 from row B and connect to row E
This now shorts the 330Ω when switched, giving it the two gain settings. Otherwise, this circuit is verified and sounds fantastic!