Multicombi. Series of combined multivibrators
Encyclopedia of radio electronics and electrical engineering / Nodes of amateur radio equipment
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I offer a series of combined multivibrators. They can be used as house or telephone bells, for burglar alarms, etc.
The first multivibrator (Fig. 1) consists of a siren and a classic multivibrator, in the arm of which the siren is mounted. Upit range - 1,2 ... 15 V. It is desirable to use a stabilized voltage source for power supply. Transistors can be any low-frequency, but it is desirable to take VT3, VT5 with increased power, for example, GT403. Diode VD1, connected between the bases of transistors VT3 and VT5 gives a "gurgling" effect. Here, instead of a diode, you can use the emitter-base junction of the transistor. By selecting the values of C3 and C4, you can change the tone of the sound.
Fig.1. Multivibrator #1
The multivibrators shown in Figures 2 and 3 create sound effects that mimic the chirping of a grasshopper and a bouncing ping-pong ball. Resistor R2 in Fig. 3, you can change the number of "bumps" of the ball.
Fig.2. Multivibrator #2 (grasshopper chirping)
Fig.3. Multivibrator #3 (ping-pong ball)
The multivibrator shown in Figure 4 can be used as a metronome when teaching music.
Fig.4. Multivibrator #4 (Metronome)
All circuits assembled without errors start working immediately. The use of old transistors is due to the desire to use the accumulated "trash" that lies "in the bins" of many radio amateurs. They can be completely replaced by modern ones.
Author: V. Mamonov, Stavropol; Publication: radioradar.net
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