Sound tester of quartz resonators. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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The performance of almost any RF quartz resonator can be easily checked using a simple device, the circuit of which is shown in the figure.
The device generates an audio tone when a working resonator is connected. Chip DD1 is a binary counter, which includes a generator.
In order for the generator to be excited, an external resonator, a resistor (R1) and two capacitors with a capacity of 10 pF each (C1, C2) should be connected to it - generation occurs at the fundamental frequency of the resonator. Then the frequency dividers of the microcircuit lower the frequency of the generated signal to the value of audio frequencies.
Transistor VT1 is an amplifier that allows you to connect a low-resistance sound head to its collector circuit to indicate low-frequency vibrations.
The prototype of the tester confidently worked with resonators from 1 to 27 MHz. In the latter case, the frequency of sound vibrations at the output of the probe will be about 6,6 kHz.
The device can use a domestic chip type 1051HL2 and transistor KT315B. As a sound head, any small-sized one with a power of 0,25-0,5 W and a voice coil resistance of at least 8 ohms is suitable.
Author: G. Pradeep; Publication: N. Bolshakov, rf.atnn.ru
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