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2017-08-20 04:42  
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This circuit drives relays of 24 and 18 Vde from a 12-V power supply. Use this circuit with almost any pnp or npn power transistor.

Parts: Ul: NE 555 timer. Cl and C2: 50 p.F/ 25 Vdc. Q1: TIP 29, TIP120, 2N4922, TIP61, T!PllO, or 2N4921. Q2: TIP30, TIP125, 2N4919, TIP62, TIP115, or 2N4918.

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