Peak Indicator (CB20736E)

This circuit triggers an LED when the input signal exceeds the peak, or the value set in RV1. The transistors can be the modern equivalents BC549.

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RTD Bridge with Operational (CB4393E)
The circuit shown in the figure below is from the 1993 Linear Technology Applications. The...
AND function with relay (CB19767E)
In the figure we have the way to implement the E (AND) function with two inputs, in the case of...
Power Supply and Battery Charger (CB15851E)
This circuit can be used both as a power source and as a battery charger. The resistor R1 serves as...