If you have the skills and can get your hands on SMD components, you can assemble this small amplifier. We found it in the Radio Electronics Experimenter special edition from 1990.
Found in a 90s Popular Electronics, this circuit generates high voltage for radiation detecting...
In this circuit found in the December 1972 Radio Electronics magazine. R can be from 1k to 22k,...
This circuit allows you to vary the duty cycle without changing the frequency. An interesting...