This untuned (aperiodic) amplifier circuit was found in the August 1974 Radio Electronics magazine. The transistors are period, and the board layout is critical.
This frequency modulated light transmitter is from a 1990s documentation. The circuit may use...
This type of configuration, which appears elsewhere in this section, was found in a 1965...
This circuit is from an Argentine publication from the 1970s but can still be assembled with...