This is part two of my Fourier module build.
Part 1 is here:
It follows the basic principles of Fourier Synthesis, and being able potentially to design your own waveforms. There aren't many modules that do additive & Fourier synthesis so I'm looking forward to finish this.
The pots (or inputs) allow control of 7 sine (s1-s7) and 8 cosine (C1-C8) signals...... supposedly
being harmonics of the initial signals. “Supposedly” because, the waves
are not pure sinewaves, rather stepped pulse waves.
This module would be well paired with a oscilloscope so you could see the waveforms that you sculpt.
Andrew also reckons that this module needs to be patched into a low pass filter.
Links
Nonlinearcircuits Builders Guild on FB:
074 opamps
resistors ... looks like the resistor matrix is complicated but there are only
three values...
there are 109 x 10k, 23x 27K, 55 x 15K .
1k resistors on the second PCB
The TL072 opamp & diodes ...LL4148
Im using a S1JL for the power protection.
The two 12k resistors set the output gains for the 2 channels.
I'm using 12K.
"At some settings the outputs may seem a bit quiet, though generally you
will see 10V p-p. If you want the outputs hotter, install a higher
value, say 22k" (Andrew F).
I'm using bipolar red/blue 3mm LEDs, so 3k3 is my value for RL.
These leds were the same used on the NLC sloth modules.
Final caps & resistors are on.
to be continued....
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