This variable frequency (VFO) oscillator was found in a Japanese publication of 1962. Coil details (in Japanese, but can be deduced) are next to the diagram covering the 3.5 MHz band.
This circuit allows the use of headphones and microphones with diverse characteristics in audio...
Here we show how to add a reset key to the monostable using two NAND gates (CB127E). When the key...
This configuration using a CMOS IC produces a 1 MHz signal. The circuit can be used as clock in...