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[Playing the bug]     [Debounce circuit]     [Arduino Uno Debouncing]

Two analog debounce circuits for the bug:

Only junkbox transistors are used.

R4 and C2 set the debounce behavior. 0.7×R4×C2 has to be larger than the longest “open” bounce. Q4 and Q5 act as a comparator.

Power supply voltage is +5V and is limited by the maximum Vbe voltage allowed

Number of inputs and outputs is optional. The BS170 at the output is suitable for most transceivers.

The next circuit behaves like the Arduino Uno sketch.

Only the key down slope is debounced!

Advantage is that debouncing doesn’t lengthen the dot/dash at the end.

Opamps are not critical. Input should be high impedance (CMOS).

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Last update: October 29, 2024

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