AC Tachometer (CB9353E)

This circuit was found in a 1969 EEE. It detects when there is a phase failure in a circuit using an inductive sensor.

| Clique na imagem para ampliar |

1MHz XTAL 4001 Oscillator (CB11868E)
This circuit has its frequency controlled by a 1MHz crystal. The circuit can be powered by...
Astable Transistorized Multivibrator (CB18539E)
This circuit is from a publication from the 60s. The transistors used are of the first commercial types,...
Band Pass Filter I (CB19684E)
This filter, found in an old manual, has characteristics of reduced overvoltage given by the graph...