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 multiplies the input resistance of an operational amplifier. As the indicated...
This circuit provides a good audio power from a signal at least 1 V of amplitude. The MOSFET must...
This sophisticated circuit using a liquid crystal display was found in Radio Electronics from the...