This circuit can be used with 3 receivers and is intended for low frequencies (medium wave range). We found it in the September 1995 Electronics Now magazine.
The operational amplifier used in this application is not the most common today. The circuit is...
In the figure we have the way to trigger a 7555 CMOS monostable with a positive pulse. The time...
This circuit was found in a 1926 German publication. It is a crystal or galena (D) receiver. The...