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Old 26th Mar 2019, 3:09 am   #17
Terry_VK5TM
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Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 2,324
Default Re: Low frequency indicator?

Quote:
Originally Posted by Herald1360 View Post
This retriggerable monostable driving a moving coil meter technique was used for diy rev counters historically and no doubt other applications too.
555 circuits for diy rev counters were quite popular too.

One example: http://www.555-timer-circuits.com/car-tachometer.html
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