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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Variable astable 4093 (CB21127E)
This circuit was found in a Popular Electronics from the 90s. The circuit has 4 frequency ranges...
INA826SEVM Amplifier Evaluation Module - Texas
The Texas Instruments INA826S Instrumentation Amplifier Evaluation Module is available from Mouser...
4069 Positive Triggering Flip Flop (CB19934E)
In the figure we have the way to control a flip-flop with the 4069 from positive pulses. The...