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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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Posted: Tue Feb 10, 2015 4:46 pm Post subject:
little drummer Subject description: drum toy |
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I got an electronic drum toy for €0,50 at a thrift shop hoping that it would have some drumsounds (instead of the usual melodies),
and it does indeed . The drum sounds are a kickdrum, snaredrum, crash cymbal and hi-hat. It also has a button
to play a build in rhythm and pressing one of the drum buttons will cause a temporary variation in the rhythm.
The circuit is just a blob but it does have a resistor on the PCB which is responsible for the pitch/speed, and a
transistor to drive the speaker which provides an open collector ouput so I can easily adjust the output voltage
(the circuit itself runs on 3V). The buttons are connections to GND so I can add external trigger inputs using transistors.
I noticed that it can only play one sound at a time and as long as a button is pressed it will disable the other sounds,
so I'll probably add some simple gate to trigger converters. I could add some circuitry to produce some rhythms
but I think I'll just add some inputs for the drums, a pot for the pitch (or maybe a vactrol), switches to turn the
drums on/off and a line output. Although the current housing looks nice it's not very practical and I got an old battery
charger that I might use for it instead. It probably has a build in transformer which I could use as a powersupply.
It'll be a while before I get started on it, but here's a picture and in the meantime any ideas are welcome.
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_________________ "My perf, it's full of holes!"
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commathe
Joined: Jul 26, 2013 Posts: 153 Location: Beijing
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Posted: Tue Feb 10, 2015 10:00 pm Post subject:
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When you put a pitch pot in, check if the voltage at the pin its connected to stays the same. If it does then it's probably current controlled -- add a transistor as a CV input Last edited by commathe on Fri Feb 13, 2015 2:00 am; edited 1 time in total |
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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