Electronic canary. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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With a relatively simple device, the singing of a canary can be imitated.
Here the generator of complex oscillations is used. The trill repetition period is controlled by a variable resistor R2, and the sound frequency is controlled by a resistor R4.
Transformer T1 output from any transistor portable receiver; dynamic head - also from a small-sized receiver. The current consumption is 5 mA, so you can use the Krona battery to power it.
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