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 good quality stereo amplifier was found in a Japanese publication from the 1960s. The circuit...
This circuit allows you to use the parallel PC interface to control LEDs. The circuit was found in...
This circuit, with printed circuit board, is from an article in Radio Electronics magazine from...