This circuit is found in the Italian magazine Radio Elettronica, August 1975 issue. There is a multi-purpose relay with a high-sensitivity transistor amplifier stage. The circuit operates with 6 to 12 V relays and 50 to 100 mA currents. The transistors are BC548 R1 is 3.3 k ohms, 470 uF C1 and the transformer has 7 to 8 V secondary with 500 mA current. The diodes are all 1N4002.
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