timer Simple Metronome Circuit w/ Linear Pot Control

Posted on Feb 5, 2014

To get the usual BPM range for music of between 40 and 240 BPM, that corresponds to periods of 1500 ms and 200 ms respectively. A BPM of 120 is exactly 500 ms. As it is, the circuit would require an R4 of 14. 5 Mohm to yield a period of 500 ms (120 BPM). I need the value to be exactly 5K (10K pot in the center position). Here`s another version.

timer Simple Metronome Circuit w/ Linear Pot Control
Click here to download the full size of the above Circuit.

That string of parallel transistors provides a 4:1 ratio step-down current mirror so that resistors can be smaller. It also makes the control current relative to ground which is nice depending on how you power your op amp.

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