555 chip, or 556 for two relays i.e duel mono amp with two transformers.
The transistors invert the signal (Q2) from the 555IC and drive the relay (Q1), R1 sets the current required to switch the relay. Relay needs to be single poll double throw type
I may try this circuit from an adapted 'wall wart' type switch mode power supply. Otherwise i will use a dedicated transformer.
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