Timer for enlargers (CB8301E)

From the time when photographs developed on paper could be enlarged, this circuit was found in a 1960s General Electric documentation.

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Differential amplifier (CB8990E)
This high input impedance circuit was found in American documentation from the 1980s. The power...
Leakage Test for Capacitors (CB24958E)
This circuit is from a Radio Electronics magazine from May 1986. Observe the voltages applied to...
Audio Line Amplifier (CB4769E)
We found this circuit in a European publication from the 1990s. Transistors are still common types...