We found this circuit in the 1983 edition of the Electronics Experimenter handbook. The circuit uses components that are common today, although many admit equivalents.
This simple timer is from a 1998 publication. Other operational amplifiers can be used, and the...
August 2017 - Rectron's Schottky Barrier Diodes can now be obtained from Mouser Electronics. The...
This circuit limits the intensity of an audio signal from a control voltage. The circuit is from a...