Pop/click free HW-based relay attenuator V2

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Place a zener diode in series with the protection diode. For example 15V. The relay then shuts off 4x faster. The zener clips the reverse peak from the coil and dumps the reverse power. One disadvantage: u can't use the internal diode from ULN2003 anymore.

Using a zener to make the relay go in the OFF state faster is a nice little trick.

But not being able to use the internal diodes in ULN200X is an annoying drawback.
 
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