This circuit was found in an 80's Poptronics. The circuit is a fast trigger whose signal can be taken from the Q2 collector. The supply can be done with voltages from 9 to 12 V.
This 1967 Electronics World circuit is suitable for frequencies up to 1 MHz. The setting applies...
Connected between an external antenna and the antenna input of a receiver, this circuit provides...
The purpose of this circuit from a 1995 publication. Its purpose is to alert a person when he...