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Drum Tone Synth Drum modifications
http://www.paia.com/talk/viewtopic.php?f=8&t=290
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Author:  richardc64 [ Thu Dec 02, 2010 6:17 am ]
Post subject:  Drum Tone Synth Drum modifications

Greetings.

I've modified the Synth Drum of the 9302K Drum Tone Board to have front panel controls for Pitch, Decay (Q), and depth of frequency Sweep. What I did was add a few pots and resistors and cut a trace on the pcb so that the trimpot that had been controlling "Q" (resonance, Decay,) instead limits the maximum Q that can be set with a front panel potentiometer.

Then I went a little further and added a switch and diodes to distort the waveform, changing the timbre of the drum tone. The last addition was another switch and a capacitor to add some "Impact" click to the sound.

Here's a view of the schematic:
http://www.sdiy.org/richardc64/new_drum ... _final.gif

And a couple of samples.

Low pitch with varied Decay.
http://www.sdiy.org/richardc64/new_drums/low-freq.mp3

Different freqs with varied Decay, Sweep and dynamics. Also, Impact clicks
have been added.
http://www.sdiy.org/richardc64/new_drums/f_d_s_d.mp3


Full instructions and a few more samples can be found here:
http://www.sdiy.org/richardc64/new_drums/paia_mod.html


NOw...can anyone explain why the Snare isn't working right for me? All I get is a short on-off burst of noise without any decay. Is it supposed to sound that way?

Author:  richardc64 [ Sat Mar 26, 2011 6:08 am ]
Post subject:  Re: Drum Tone Synth Drum modifications

Content deleted. See next.

Author:  richardc64 [ Sat Aug 06, 2011 1:16 pm ]
Post subject:  Re: Drum Tone Synth Drum modifications

Sorry to bump this, but I've simplified how a Decay control is added, gotten LFO/External modulation to work (within limits,) and improved wave "warping."

Details are here: http://www.sdiy.org/richardc64/new_drums/conga.html

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