This is an analog circuit that plays a synthesized drum beat. It can be scaled in amount and the quality of the noises.  

Step 1: What You Need

1 power source
3 breadboards
Wires (Yellow, Blue, Red, and Other) if you feel like following conventions
2 Speakers
6 OPA551 Op-Amps
2 TL081 Op-Amps
4 2N3904 NPN Transistors
2 10kOhm potentiometers
2 diodes
2 LEDs (optional)
3 200kOhm
6 1kOhm
2 4.4kOhm
1 3.7kOhm
3 1.7kOhm
2 160kOhm
3 5.8kOhm
4 0.1uF
2 0.047uF

An Oscilloscope for debugging can come in quite useful.
Wire stripper/cutter

<p>i'm really interested in experimenting with this, do you have any suggestions for a replacement for the opa551? thanks!</p>
<p>Since the outputs are buffered by the transistors, you don't need the <br>opa551. In fact, none of the outstanding features of the opa551 are <br>important for this (high voltage/&quot;high&quot; current out). A simple and <br>generic op amp like the lm124 (which has 4 op-amps in it) would probably <br> work.</p>
<p>good to know, I'll start with whatever opamps i have and see how it goes. thanks!</p>
<p>The opa551 was what we had readily available. I would agree that it was probably over specced for this application. The opa37 is quite a bit cheaper.</p><p><a href="http://www.ti.com/product/opa37" rel="nofollow">http://www.ti.com/product/opa37</a></p><p>There are definitely some places in the circuit where a TL081 would have worked as well. </p>
<p>awesome, thank you very much!</p>

About This Instructable


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Bio: I'm a student at Olin College of Engineering fascinated with robots, EVs, and where electrical engineering and music collide.
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