This circuit produces a pulsating intermittent sound in frequency that can be adjusted in P1. The frequency of the tone can be adjusted in P2. The circuit works with voltages from 6 to 12 V and with voltages of 12 V the transistor must be equipped with a radiator. The circuit can be used in alarms and warning systems. For lower power, supplying 6 or 9 V, a BD135 transistor can be used.
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