Found in a 73 magazine for radio amateurs of the 90s, this circuit provides a 2 kV voltage with 7.5 mA of current for HeNe laser.
We found this 50 kHz 25 MHz crystal tester in a 1978 QST magazine. The FET can be the BF245 and...
Suggested by National Semiconductor in documentation from the 90s, this circuit makes use of an...
Found in American documentation, this crystal oscillator that can have harmonics in the FM range,...