True RMS Voltmeter (CB25353E)

This circuit is from a Radio Electronics magazine from August 1990. The indicator module is of a common type at the time.

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10 W Amplifier (CB6175E)
This circuit is from Mullard documentation from 1969. Transistors support current equivalents. Output...
Delay Relay (CB11985E)
By activating S1 the relay closes its contacts only after a certain time interval that depends on C1....
Logarithmic Converter for Photodiode (CB14317E)
The circuit shown is from National Semiconductor's Linear Applications Handbook published in 1994....