This QST circuit generates 4 frequency signals according to the crystals used. Transistors admit equivalents although the indicated types can still be found with some ease.
This circuit is from the LM107 manual. This operational is from the 80s, but the configuration is valid for...
With the light falling on the LDR, the relay closes its contacts by activating a warning system. The...
This new AMS device consists of a digital color sensor and proximity sensor that also incorporates an infrared...