Chicken generator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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The "Chicken" generator imitates the clucking of a chicken.
The generator contains a controlled audio frequency generator GZCH, made according to an autotransformer circuit on a transistor VII. The frequency of the generator 2-2,5 kHz is determined by the parameters of the LC circuit and the resistances of the resistors R15 and R17. The DC generator operation mode is set by resistor R14. The audio frequency generator is controlled by the MV2 multivibrator operating at a frequency of 4-5 Hz. The multivibrator MV1, which is a synchronizer, gives permission for the operation of MV2 and at the same time switches the corresponding elements of the GZCH, providing the required change in the generation frequency of the latter, since the sounds "kud-kud-kud" should be much lower in frequency than the subsequent sound "yes-ah-ah" ". For greater resemblance to the cry of a chicken, the next cycle of sounds "kud-kud-kud-da-a" comes after a pause of 0,5-0,6 s, provided by the UE pause node, made on the basis of an analogue of a unijunction transistor, consisting of silicon transistors V7 and V8.
(click to enlarge)
Multivibrators MV1 and MV2 are made according to similar schemes on transistors V2, V3 and V5, V6 and differ only in timing elements. The outputs of the multivibrator MB1 to eliminate the influence of the load on its frequency are connected through emitter followers on transistors VI and V4. Amplifier 34 is made according to a transformerless circuit on transistors V14-V18 and provides an output power of up to 0,5 W at a load of 6 ohms at a quiescent current of 20-25 mA. Circuit R18 SP SU is a low-pass filter.
The ratio of the duration of the sounds "kud-kud-kud" and "yes-ah-ah" is selected by selecting the resistor R3, the duration of the individual sound "kud" is regulated by the resistor R9, the frequency and timbre of the sound with unchanged C7 and C8 are set by the resistor R17, the pause is adjusted by selecting resistor R11. The ratio of the loudness of the sounds "kud-kud-kud" and "yes-ah-ah" is obtained by selecting the capacitance C11.
Details. Transistors V1, V4, V8, V14, V16 type KT315A; V2, V3, V5, V6, V11 type MP38A; V7 type MShch16; diodes V9 type D9B; V10, V12 type D7B; V13 type D106; V15 type MP140A; V17 type GT404V; V18 type GT402V. Transistors DSh38A can be replaced with MP37A; KT315D - on KT315, KT312 with any index or on MP111, MP113; MP40A-on MP41A, MP42A, B; MP116 - on MP114, MP115. All fixed resistors in the circuit are of the MLT-0,125 type (R25 of the MLT-0,5 type), electrolytic capacitors of the K50-6 type, capacitors C6-C8, C10 KM-6. Transformer T1 - output from any transistor radio.
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