This Texas Instruments circuit is from the 80's. However, it can be implemented with modern operating systems. The power supply must be symmetrical.
This RF circuit measures transmission power from 0.25 W to 10 W. The maximum frequency depends on...
This General Electric circuit was published in 1970. The LED is infrared and the voltage according...
Found in a 1968 Motorola publication, this circuit generates a high-powered audio tone when...