Notes on the lm567 chip
I have been experimenting on a lm567 breadboard. ...and I found the following:
$ is also affected and detects multiples of the center frequency with less sensitivity, so the detection range must be narrowed, especially with the square wave.
$ It works well with frequencies of kHz, and the higher the frequency, the greater the detection accuracy and reliability.
$ It faces problems and difficulties with very low frequencies Hz in terms of reliability and detection accuracy.
$ It needs a different approach in design to accurately detect very low frequencies.
$ The high noise of the supply voltage stops it from working.
$ Using a high variable resistor, such as 470K, to switch the center frequency is not suitable for this chip.
$ The input signal voltage is less than 20 mV and it will stop working.
$ The input signal voltage is higher than 200 mV, the bandwidth increases and the accuracy decreases
.$ The use of large capacity capacitors for the output capacitor C3 is desirable when detecting very low frequencies to increase the delay and get rid of unwanted signals
$ Connecting capacitors to connections close to the chip to reduce noise.
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