This circuit was found in the November 1966 issue of Electronics Now magazine. It uses an LDR as a sensor and has a Bargraph scale with the well-known LM3914.
This circuit was found in an English magazine from 1979. The magazine no longer exists, but the...
This is the power supply circuit for the amplifier in the previous circuit. The source is...
These circuits use loads of 50 ohms to allow the use of a voltmeter in evaluating the output of a...