Tuesday, October 16, 2007

WP-20 sound effects synthesizer



I have been building some noisemakers using cardboard as pcb. It´s a nice material for building electronic projects at home because: 1. everybody may not have the needed equipment to make "real" pcb:s 2. every one has a piece of cardboard laying around. 3. It is cheap and easy. This is my latest creation on cardboard pcb. It´s wp-20 sound effects synth. It was very nice to do on cardboard because there was enough spce between components in the original pcb design.

I did´t use the original noise source with 18v but i built a simple 9v noise generator. I left q1, r1, c3 unconnected to the board. here is the noise circuit.
output of the noise generator was connected to r3 through 50k resistor.

Testing wp-20 video:
link to music from outer space wp-20 page:




I made a sub oscillator for my wp-20. It is based on cd4040 ripple counter it uses the vco squarewave (before the 100k resistor marked R8 in the original wp20 schematics) as clock input and divides it. Six switches (from 1 octave down to 6 octave down) select the harmonics to vcf-vca. The circuit is quite simple the component values may be tweaked to get better performance. I used components that I happened to have so some different values might work better but these seem to work ok. (sub osc out is connected to ic 2b pin 6 through a 100k resistor like the vco) here is a picture of the circuit





60 comments:

chikilicuatre said...

Hi, i found very interesting the modifications you made to the WP-20 synth, but i have a question to you:
in the sub-oscillator schematics, who is the circle with 470k inside?? is a resistor or a capacitor?? (i think it is a resistor) but how is the connection with 200k resistor and 1uF cap?? I don´t understand this connection because de schem is not clear !!
Can you help me with this ??!!
please contact with me !!

caballitorecords@yahoo.es

(and sorry for my english!!)

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It´s wp-20 sound effects synth. It was very nice to do on cardboard because there was enough spce between components in the original pcb design.
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