This dual-gate FET RF signal mixer circuit was found in a 1980s documentation. The circuit is intended for applications in superheterodyne receivers of the time.
The oscillator in the figure has its frequency determined by the crystal. The indicated value is...
This circuit activates an incandescent lamp (or LEDs) when the light stops hitting the sensor, which...
This didactic circuit was found in a 2001 documentation. It automatically counts in an increasing and...