5 LED Log Scale with U257B (CB25442E)

The circuit was found in the February 1992 Radio Electronics magazine. The scale can be changed by changing R2 and R3.

3-Transistor Amplifier (CB21858E)
Found in the 1974 Ferranti transistor manual, this circuit uses components from the time,...
Zero Crossing Detector (CB19481E)
This “zero crossing detector” was found in a manual of operational amplifiers from the 1980s....
Series LC Oscillator (CB24027E)
This emitter-coupled transistor LC oscillator circuit was found in the May 1970 issue of Radio...