This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be assembled easily, since all the components are common. With this circuit we can generate rectangular signals delayed in three phases, as it consists of an astable tri-vibrator. The transistors can be the BC548 and the capacitors determine the duration of the phases and the final frequency of the circuit. The supply can be done with voltages from 6 to 15 V.
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