How to build an analog pitch shifter for guitar? DIY stuff…?
How to make an stompbox that changes the pitch of a note, like the frequency? So to play a A4(440H) on guitar and to get an A5(880H). And how can the stompbox have a potentiometer to change the frequency, like a linear but for pitch not for volume or tone. Any Schematics, ideas?
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Changing pitch is a surprisingly hard thing to do, and basically impossible in an all-analog circuit. The closest you can get would be to use analog bucket-brigade devices and do some very fancy variable-frequency clocking… you don’t want to go there.
You can get an octave above by full-wave rectifying the signal. The good thing about this is that the circuit is really simple, the bad thing is that it only works on one note at a time. Playing a chord through it will sound like armageddon.
Here’s a circuit. I have seen simpler ones but I can’t find one online. Beware there is another octaver circuit that seems to be replicated all over the web, but it cannot possibly work.
Sorry, link does not work due to website crappiness. If you are interested send me an email and I’ll send you some schematics.
What you just described does actually exist and has been used since the early days of electronic music. It’s known as a klangumwandler. Because it shifts the pitch of all the harmonics in the sound by the same amount the result tends to be very unnatural and dissonant.
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