LF frequency meter on integrated circuits. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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The figure shows a diagram of a frequency meter that provides frequency measurement with an accuracy of at least 2%. A signal of any shape with an amplitude of at least 2 V is fed to the input of a trigger made on inverters MC1a, MC1b. Diode D1 and resistor R1 provide a positive half-wave of the signal. Rectangular pulses of positive polarity are differentiated by the C1R3 chain and fed to the pulse width shaper. The average current of these pulses, proportional to the frequency of the input signal, is measured by the IP1 device.
The limiting frequency to be measured is determined by the recovery time of the standby multivibrator. For the values of resistors and capacitors indicated on the diagram, it is equal to 100 Hz.
In the frequency meter, you can use the K155LA3 chip, the D220 series diode. Zener diode KS156A. The resistance of the resistor R6 depends on the supply voltage. For a voltage of 12V, it is equal to 200 ohms (0.25 W).
Literature
- "Radio fernsehen elektronik" (GDR), 1975, No. 17
Publication: N. Bolshakov, rf.atnn.ru
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