rediculously simple arp odyssey style ringmod

beep · Joined: May 05, 2013 Posts: 105 Location: Germany

this is just a rectifier but it works fine. you'll need dc-coupled signals.
works best with square waves.

No need for the waste of a quad nand chip anymore Very Happy

works also with other waveforms, but they must be dc-coupled.

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PHOBoS · Posted: Fri Mar 11, 2016 5:12 pm Post subject:

I've seen discrete XORs (which is what the 4 NANDs do) using a bridge rectifier before but it looks like this:
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what you posted is just an OR gate with 2 diodes doing nothing, unless I am missing something.

beep · Joined: May 05, 2013 Posts: 105 Location: Germany

LOOOOL ... it really just needs those two diodes.
But it performs like a ringmod ... what's the difference between
xor and or gate? for me it sounds pretty much like
the odyssey ringmod and it also works with analog waveforms.

Let's call it pseudo ringmod but it does amazing things with the input signals

PHOBoS · Posted: Sat Mar 12, 2016 11:46 am Post subject:

with an OR gate the output is high if at least one of the inputs is high

OR:
A B X
-------
0 0 0
1 0 1
0 1 1
1 1 1

with an XOR gate the output is high if only one of the inputs is high (at least for a 2 input XOR)

XOR:
A B X
-------
0 0 0
1 0 1
0 1 1
1 1 0

XOR sounds a bit more "metallic".
here's a short demo. The first 36 seconds is OR and after the silence XOR.

PHOBoS - OR-XOR.mp3

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PHOBoS - OR-XOR

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beep · Joined: May 05, 2013 Posts: 105 Location: Germany

Oh yeah, wow, that was enlightening. Thank you, Sir. Smile

There is much more going on with the transistor in the circuit.

I did a bit of simulator testing with the or gate and found
out something interesting going on when pulling the
other two diodes to v+ and mixing both outputs together.

There are lots of fun to be had with "random" gate pattern
generators and stuff now.

If you change the waveform and have triangle in one
input and squarewave in the other input, the output waveforms look
like skylines.

All those weird LFO-mutations that could be created with diode gates ...
from just two square/triangle lfo generators, which are done
in no time with a 40106 and a buffer