This crystal oscillator generates a 20 MHz signal. Equivalent transistors such as BF494 and 2N2222 can be used. The stabilizing diodes can be 1N4148.
This monostable circuit uses one of the two flip-flops available on the CMOS 4098 integrated...
This crystal-controlled oscillator generates a 1 MHz rectangular signal and can be used as a time...
Suggested by a 90’s Radio Electronics, this circuit automatically activates the recording switch of an...