Electronic metronome. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Musician
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An electronic metronome, made according to the scheme given here, is very convenient for classes at a music school: it simultaneously creates sound and light signals of rhythm, which the performer perceives both in the classroom and on the stage, even at the maximum volume of the orchestra.
The polarity of the capacitor C4 must be reversed.
The basis of the metronome is a pulse generator on two transistors of various structures (T1, T2). The C4R2R3 chain determines the pulse repetition rate. With the help of the RS resistor, this frequency, and thus the frequency of the metronome beats, can be varied from 20 to 240 beats per minute. The supply voltage stabilizer on the D1 diode provides the necessary constancy of the frequency of shocks with fluctuations in the supply voltage in the range of 175-245 V.
A ballast capacitor C1 of the MBGO (metal-paper) type for 600 V is included in the alternating current circuit. The remaining capacitors are electrolytic, of the K50-6 type. Bulb L1 - switch, 6 V, 60 mA. As a transistor T1, you can use any low-power transistor of the npn structure.
All parts of the metronome are located in the case of a small subscriber loudspeaker "Morning" (with voice coil resistance Gr1 8 Ohm).
Author: A. Firsov, Beretiki, Perm region; Publication: N. Bolshakov, rf.atnn.ru
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