This oscillator uses a small IF transformer taken from an old transistor radio. FET admits equivalents. The circuit can be used to calibrate radios.
This Radio Electronics circuit, in an 80's edition, decodes the 67 kHz signal used at the time to...
One touch of the sensor and the LEDs run. When you take your finger off the sensor, only one will...
This circuit uses two operational amplifiers, which can be of the type 741, in a full wave...