Analog frequency meter 45 Hz-19kHz schematic + demo

Опубликовано: 16 Май 2016
на канале: radiofun232

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Analog frequency meter made with a 555. Works good. You need a counter to calibrate it and draw 3 scales. The resistors to the meter (here 27 Ohm and 4 K) must be found out experimentally (depends on the sensitivity of the uA meter). Re-tested the circuit on 13 december 2019 and it worked again.

nb: when you make a divider unit with digital chips at the input the range can be extended to 20 MHz or so. e.g. 20MHz:10=2MHz:10=200 KHz:10=20 KHz:10=2000 Hz. This frequency is in the range that the meter can handle.

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