This crystal oscillator generates a 20 MHz signal. Equivalent transistors such as BF494 and 2N2222 can be used. The stabilizing diodes can be 1N4148.
The circuit shown in the figure is the version activated at the low level, of the previous circuit...
This circuit is from an old American documentation using LEDs in the rectification. The circuit...
This circuit consists of an emitter follower, presenting unit voltage gain implemented with an...