Duck quack simulator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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The simulator (Fig. 1) is an asymmetric multivibrator made on two transistors. Headset BF1 is connected to one arm of the multivibrator, LEDs HL1 and HL2 connected in series are connected to the other. Both loads work alternately - either a sound is heard from the phone, or LEDs flash - the eyes of a duck.
The multivibrator is turned on by the reed switch SA1, to which a permanent magnet approaches while the toy duck is tilted or is brought in the form of a "magic wand" (it can be, for example, a pencil, at the end of which a small magnet is disguised).
Fig. 1
Transistors can be any of the MP39-MP42 series, but with a current transfer coefficient of at least 30. Resistors - MLT-0,125, capacitor C1 - K50-6, C2 - MBM. Head phone - TM-2 or other small-sized, with a resistance of 100 ... 200 Ohm. Instead of those indicated in the diagram, other LEDs are suitable. The brightness of their glow is set by selecting the resistor R3. Power source - Krona battery, reed switch - KEM-1.
Establishing a simulator comes down to selecting a resistor R1 until a characteristic quacking sound is obtained.
Author: E. Brignevich, Kislovodsk; Publication: cxem.net
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