We found this circuit in the November 1992 Radio Electronics magazine. The circuit uses an LDR as a sensor and the transistor can be any general-purpose transistor.
This circuit is from a Popular Electronics from July 1990. The magazine no longer exists, but the...
Other operational amplifiers series, such as MC34072, MC34074, MC35071, MC35072, MC35074 d MC33071...
This gain 10 CMOS op amp was found in the May 1993 issue of Electronics Now magazine. It is...