This circuit is from a 2004 documentation serving for signals from 1 MHz to 160 MHz. The antenna is of the telescopic type and the analog instrument is of the type found in old sound equipment.
The integrated circuit used in this 1986 project is not very common today. The circuit uses few...
This circuit controls a relay causing it to open and close its contacts at a speed that depends on the...
The circuit is from the MC1539 manual, an operational one close to the 741. The transistor admits...