Meow generator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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The "Meow" generator contains a low-frequency generator of rectangular pulses with a frequency of 0,2-0,3 Hz, which controls a sinusoidal generator of 600-800 Hz.
The first generator is assembled on transistors V1 and V2 according to the scheme of an asymmetric multivibrator. Rectangular pulses generated by this generator charge capacitor C5 through resistor R3, which supplies a bias voltage to transistor V3. An RC oscillator is assembled on transistor V3, which, under the influence of a control bias voltage, produces oscillations damped in amplitude with a frequency of 800 Hz. The audio frequency amplifier is assembled on a V4 transistor.
Establishing the generator is reduced to the selection of capacitor C3 (to correctly simulate the sound "meow"), capacitors C1 and C2 (to set the pause between sounds), resistors R5 and R8 (to set the tone of the sound), capacitors C4, C5, resistors R6 and R7 (for adjusting the pitch). The sound source is a telephone primer of the type DEM-4M, DEMSH-1.
Transformer Tp1 - matching from any transistor receiver or home-made with the following data: primary winding 450 x 2 turns of PEL wire 0,04 (DC resistance 700 Ohm), secondary winding - 100 turns of PEL wire 0,23 (R = 2,3 Ohm ) on the magnetic circuit Ш4 x 8. Power supply - battery "Krona" with a voltage of 9 V.
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