Found in an Electronic Design from the 90s, this circuit makes use of a PLL CMOS. Values for various components are not indicated.
Using a sensitive reed relay (20 mA or less) it is possible to drive a high-power load from TTL...
We found this circuit in a 1998 documentation. The circuit can be made with 12 V, 6 V or even 5 V...
This circuit was found in Ferranti's 1974 transistor manual. The circuit is for non-critical...