2017-08-07 Protoboards And Bypass Capacitors

From FB post

One important thing that people forget to do is consider what might happen with a circuit that has anything that draws power from the protoboard.
If you’re working with a few low power devices such as small LEDs and switches, then there is usually not a problem.

But if you have a buzzer driven by a transistor, the current may be high enough to cause the supply voltage on the protoboard to drop, and that may cause the device to sense that a switch was falsely pressed. The results may be very odd behavior.

The solution is to put a few bypass capacitors across the power supply lines on the protoboard.  Something between 0.1 uF up to 10 uF will usually prevent or cure the problem.

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