You can use this circuit diagram to create a very simple electronic horn that requires very few external components and is easy to construct. An oscillator consisting of K-closed switching transistors T1 and T1 will produce a rectangular signal. This electronic horn circuit will consume about 40 watts, the maximum output power, so the audio signal of this horn circuit will be a little louder. This horn circuit requires a 6 volt DC power supply. At T1, the transistor of T2 must be of a BC107 type or similar. The T3 transistor should be a 2N2613 NPN transistor or 140141, 2N1990, 2N2102, 2N2405 or other similar type. The transistor of T4 must be an AU106 PNP transistor or 113 AU, AU 213, 2N5324 or other similar type.
The protection of the diode D1's T4 transistor must be 1N5400, 1N5401, 1N5408 or other similar type.
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