Nightingale, piglet, puppy sound generator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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The basis of the "nightingale" circuit (Fig. 1) is three multivibrators. The first of them, assembled on transistors V6, V7, generates a tone signal with a frequency of about 2000 Hz. The signal is amplified by transistor V8. The control multivibrator on transistors V4, V5 periodically turns off the first multivibrator. The operation of the second multivibrator is controlled by the third, assembled on transistors V1 and V2 with a current amplifier on transistor V6. The load of this amplifier is the winding of relay K1. The switching frequency of the transistors of this multivibrator is chosen so that it does not coincide with the frequency of operation of the second multivibrator. When V2 turns on, V3 turns on with it. The relay is activated and with its contacts K.1/1 connects resistor R7 in parallel with resistor R8. As a result, the total resistance in the base circuit of the transistor U4 changes, and, consequently, the switching frequency of the transistors of the second multivibrator.
As if two switching modes of the first multivibrator are created on transistors V6 and V7. The nature of the sound resembles a nightingale trill.
Ris.1
In the described generators, you can use any low-frequency transistors with a current transfer coefficient greater than 15. Electromagnetic relays RES-10 (passport RS4.524.303), a transformer - from any small-sized transistor receiver.
It is worth changing the ratings of the circuit parts in the electronic nightingale circuit and excluding the relay, as you will get an "oink-oink" generator that imitates the grunting of a piglet (Fig. 2).
Ris.2
Eliminate the average multivibrator and relay from the electronic nightingale - and you get a "barking" generator (Fig. 3).
Ris.3
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