This circuit switches on an external load after a certain interval given by the capacitor. The circuit is from a documentation from the 80s. The load depends on the relay used.
This traditional metronome configuration uses unusual transistors in the original version, but it...
This circuit was found in Texas Instruments documentation from 1968. The transistors are from that...
This sensitive field strength meter was found in 1993 documentation. The instrument may be the...