We found this preamplifier for the 10 and 11-meter range in an old documentation for radio amateurs. The integrated circuit used is uncommon today.
This simple regulated power supply was found in a 1977 documentation. The zener diode determines the...
This circuit was obtained in a 1977 Radio Handbook. The transistor is from the era and the coils...
This circuit uses matched transistors. The circuit is from Electronics Now magazine and has a...