This circuit uses four BJTs – 3 NPN and 1 PNP high current to drive the load. It has two touch pads, one for On and one for Off. I don’t see any information about the power supply voltage or load current. Some maximum voltage and current should be given for the circuit as shown.
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This may be helpful when choosing the amount of capacitance for a certain unregulated AC power supply – the kind that uses an old fashioned transformer. It calculates one variable given the others. https://www.chipbuilder.com/full-wave-power-supply-ripple-calculator.html
I also got several of these relays from goldmine-elec.com. I got them when they were on sale. There are more characters printed on the coil, including the 1500 ohm resistance. These are standard frame relays, with double pole, double throw contacts (see the pic). The pins are made for insertion into a PC board. The
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