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.
An integrated circuit 741 (operational amplifier is the basis of this voltage indicator, which can also...
This circuit converts inductances on two scales into voltages. The circuit was obtained from a...
This field effect transistor amplifier circuit in common gate or common port configuration is from an old...