Found in an Electronic Design of 1964, this circuit is intended to the signal amplification in the 88 to 108 MHz band. The transistor can be a modern equivalent.
The integrated circuit used in this application is uncommon today. However, the basic...
This circuit controls a relay from the light incident on a sensor. The sensor is an LDR and the...
This circuit has already appeared on this site and in our articles. This version is from 1999. The...