This circuit triggers a reed relay from an input voltage. The circuit is from a 1980 publication and the transistor may be the BC548. The circuit is valid for relays from 6 to 12 V with supply from 6 to 12 V and maximum driving current of 50 mA.

This circuit triggers a reed relay from an input voltage. The circuit is from a 1980 publication and the transistor may be the BC548. The circuit is valid for relays from 6 to 12 V with supply from 6 to 12 V and maximum driving current of 50 mA.