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 circuit was obtained from a 1978 Practical Wireless. It generates a low frequency, low...
This conventional LED effects circuit uses integrated CMOS. Today we can achieve the same effects...
This small blocking oscillator for approximately 1000 Hz was found in an American documentation from the...