Drum Tone Synth Drum modifications

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richardc64
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Joined: Sun Nov 28, 2010 4:45 pm
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Favorite topic: Enhanced pat-downs
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Drum Tone Synth Drum modifications

Post by richardc64 »

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?
richardc64
Posts: 3
Joined: Sun Nov 28, 2010 4:45 pm
Hometown: NYC
Favorite topic: Enhanced pat-downs
Super Robot Smashing Puzzle Time!: 12

Re: Drum Tone Synth Drum modifications

Post by richardc64 »

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richardc64
Posts: 3
Joined: Sun Nov 28, 2010 4:45 pm
Hometown: NYC
Favorite topic: Enhanced pat-downs
Super Robot Smashing Puzzle Time!: 12

Re: Drum Tone Synth Drum modifications

Post by richardc64 »

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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