Posted: Sat Aug 23, 2008 4:17 pm
Cool. I think I like the top left, or the bottom left, although the bottom right will probably be easiest to hide a knob in the middle of.
http://www.buildyourownclone.com/phaser.htmlMike wrote:I haven't looked into phasers yet, but I imagine it means at least 3 ICs.
Holy fuck, what?DuoSonicBoy wrote:Phasers use a high-pass capacitor combined with a resistor to emphasize a given frequency, determined by the resistance. The resistance is constantly changed by the JFETs and LFO IC, hence the emphasis is swept up and down. Functionally, it's similar to turning your tone control up and down.
The Phase part comes into play because each of these resistor/capacitor networks is hooked into the inverting input of an OpAmp, which flips the signal's polarity 180 degrees. This usually happens 4 times (in the case of a Phase 90 or SS). Since a Mono device cannot push and pull the signal at the same frequency simultaneously, the frequencies which each stage had in common with the one preceding it are canceled out inversely proportional to their amplitude. Hence, the emphasized frequencies become notches.
Basically the chain is: Buffer-Filter-Mod-Flip-Filter-Mod-Flip-Filter-Mod-Flip-Filter-Mod-Flip-Buffer-Blend-Out
Finally, a bit of uneffected signal is blended back in to make the effect more subtle.
No, thanks for the link Mike.Mike wrote:Check out tehse guys:
http://www.futurlec.com/PotSliding.shtml
Insanely cheap. Their regular pots are Alphas and sell for $0,50.
Totally recommend them. Are you making a Harmonic Perculator?
SCIENCESparky wrote:Holy fuck, what?DuoSonicBoy wrote:Phasers use a high-pass capacitor combined with a resistor to emphasize a given frequency, determined by the resistance. The resistance is constantly changed by the JFETs and LFO IC, hence the emphasis is swept up and down. Functionally, it's similar to turning your tone control up and down.
The Phase part comes into play because each of these resistor/capacitor networks is hooked into the inverting input of an OpAmp, which flips the signal's polarity 180 degrees. This usually happens 4 times (in the case of a Phase 90 or SS). Since a Mono device cannot push and pull the signal at the same frequency simultaneously, the frequencies which each stage had in common with the one preceding it are canceled out inversely proportional to their amplitude. Hence, the emphasized frequencies become notches.
Basically the chain is: Buffer-Filter-Mod-Flip-Filter-Mod-Flip-Filter-Mod-Flip-Filter-Mod-Flip-Buffer-Blend-Out
Finally, a bit of uneffected signal is blended back in to make the effect more subtle.
Yes - 2AM post is inaccurate. It's blended back in with an out-of-phase signal produced by the effect section, causing the corner frequencies to be canceled out. If you disconnect the clean blend, you get a vibrato effect.Mike wrote:Actually I think teh original signal is blended back to make the effect audible rather than subtle.
You what?BacchusPaul wrote:... the bottom right will probably be easiest to hide a knob in the middle of.
YES!!! DO WANT!More Cowbell wrote:Can aen or mike make a copy of this pedal but call it "flying poo" with a pic of a monkey instead of a bug with wings?