I built a DOD overdrive 250 a while ago, and while I quite like it, i tend to find at higher gain settings it gets too bright/trebley for my tastes. I figured I'd install a tone control and had a bash at the low pass filter that is described in the Mod's section of Aron's site. Firstly - I'm not sure, but I expect that this is supposed to work like most tone controls - rolls of high frequencies as you take it back from maximum setting towards 0?
Anyway, I tried it, using a 10k pot and a 0.01uf cap and it didn't seem to make any difference at all. There was no noticable change in tone throughout the rotation of the 10k pot. This leads me to believe I may have stuffed it up somehow. I'm sure I've done whats on the schematic though. The only queston I had was whether it needs to go before or after the volume control? I tried both and neither worked, so I figured it may not matter.
suggestions?
thanks
tim
A couple well-respected tone controls are a good way to go:
Pirate the tone control section out of a TS-9
or use the Big Muff Pi tone control
For your 10k pot idea...I'm not sure how it's set up, but if you have the 10k pot in series with the signal path, that should make a difference. If you're just using it to bring the cap in parallel with the output, the low impedance output might be making the time-constant too short, so the frequencies you're filtering may be inaudible. Maybe try making your capcitor bigger until it makes a difference.
Hi.
Yep the thing above about the 10k/0.01uF cap is right - the effect depends on the output impedance of the circuit. For something like the Bazz Fuss I use a reasonably large cap (0.1uF), and even then it's not a huge effect. If the output impedance is really low (e.g. a few tens of ohms like an op-amp) you might need to go very large with the cap.
cheers
Hi,
just build a Mix out of the TS and the Voodoo Lab Overdrive (the old 2Knob Version)
I build the Voodoo Lab OD and it works gooooooooood.
at low Gain it can boost very well and dont cut Bass.
When Gain is turned up over 3/4 the warm Overdrive goes over into
a crunch. Sounds great in front of a Clean Amp!
bye
Oliver
saxtim~
just remember that tonestacks will reduce your output/gain, so if you splice a BMP tonestack into the end of the circuit... it might make that circuit barely get louder than unity... i play a OD 250 clone, i love it... but it barely cuts through my stage mix...
hth,