Found in an Electronics Now from the 90s this mixer has several inputs. The integrated circuit can still be found easy and the power supply need not be symmetrical.
This circuit triggers a reed relay from an input voltage. The circuit is from a 1980 publication and the...
This circuit using a SIDAC as a relaxation oscillator was found in the ON Semiconductor manual for...
This transistor flasher was found in an English magazine that no longer exists from 1975. The...