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[Playing the bug]     [Debounce circuit]

 

 

A cheap debounce circuit 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.

 

 

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Last update: June 13, 2022

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