NE602 Crystal Oscillator (CB26005E)

This oscillator reaches 50 MHz with an overtone crystal. The circuit is from Electronics Now magazine from February 1997.

Turntable preamplifier II (CB19173E)
This preamp version uses BC109 transistors that are older versions of the current BC549 in plastic...
Comparators for opposite polarities (CB9590E)
This circuit was found in a 1980s documentation, using a comparator from the time. The...
Push Pull Old Output Stage (CB919E)
I found This circuit is in a documentation of transistors from 1958. It uses germanium PNP...