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Vintage threads from the first ten years

previous: Mark Hammer The T-Wah is an older BOSS unit tha... -- 8/27/1999 2:03 AM

Re: what's a T-wah?

8/27/1999 2:39 PM
R.G.	Re: what's a T-wah? Absolutely correct on the 2K Mark. It's there to balance any oddities between the two inputs. It's a trimmer. The new PCB's for a Dynacomp clone from GEO have the trimmer printed on the board. The GEO Neutron board implements the same circuit as the Mutron III, and shows four ways to make the LED/opto circuit. C.J. Landry also has some direct replacements for the LED/opto like the original. The MXR Envelope Filter is a digital filter. It uses CMOS switches to vary the duty cycle on its capacitor, effectively varying their value. The digital portion of the circuit is pretty straightforward, but keeping the digital signals out of the analog signal path probably needs some good grounding and layout work - at least for me. I haven't made one of these yet.

8/27/1999 2:39 PM

R.G.

Re: what's a T-wah?

Absolutely correct on the 2K Mark. It's there to balance any oddities between the two inputs. It's a trimmer. The new PCB's for a Dynacomp clone from GEO have the trimmer printed on the board.

The GEO Neutron board implements the same circuit as the Mutron III, and shows four ways to make the LED/opto circuit. C.J. Landry also has some direct replacements for the LED/opto like the original.

The MXR Envelope Filter is a digital filter. It uses CMOS switches to vary the duty cycle on its capacitor, effectively varying their value. The digital portion of the circuit is pretty straightforward, but keeping the digital signals out of the analog signal path probably needs some good grounding and layout work - at least for me. I haven't made one of these yet.

Replies:

Rick MXR Envelope Filter -- 9/6/1999 4:30 AM
Tracy Re: what's a T-wah? -- 9/16/1999 6:26 AM