Cuckoo imitator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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A circuit that imitates the voice of a cuckoo is shown in the figure.
(click to enlarge)
The device contains a master oscillator made on transistors V1 and V2. On transistors V7 and V8, the generators of the first and second cuckoo tone are assembled. The generators are controlled by bias voltage drivers on transistors V3-V6. Amplify the AF assembled on transistors V9 and V10. The device is powered by a 9V source (for example, a Krona battery). Capacitor C16 serves to prevent self-excitation through the power supply. The power is turned on when the magnet is brought to the reed contact S1.
Transistors V1 and V2 must have a static current transfer ratio of at least 40; V3-V6 - at least 20; V7-V8 - not less than 90; V9-V10 - at least 60. Output transformer - from any transistor receiver using half of the primary winding, dynamic head B1 - with a power of 0,1 ... 0,5 W.
The establishment of the simulator begins with a current generator. Their frequency is set by selecting capacitors C7, C8 and resistor R13 for the first generator and C10, C11, R18 for the second. The sound volume is set by selecting the resistor R24. The duration of the generators is selected by capacitors C4, C5, and the frequency of "cooking" is selected by the selection of capacitors C1 and C2.
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