Constant current source (CB8697E)

This circuit was found in a 1968s European documentation. It is a current regulator using complementary general-purpose transistors.

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Telesimulator (CB4294E)
The basic idea of this 1989 circuit is to trigger a relay for a while when a call signal occurs on...
Phonographic preamplifier (CB8937E)
This preamplifier for phonographic capsules using FET was found in 90s American documentation....
100 Hz High Pass Filter with the 741 (CB11463E)
The circuit presented was obtained from an Electronics Now magazine from February 1995. The...