Obtained in a 1968 Electronics World, this circuit uses transistors from the time and the sensor is a common LDR. The component values are for scales from 0.01 to 100 foot-candle.
This preamplifier is intended for the use with magnetic pick-ups. Power supply must have voltages...
This circuit converts inductances on two scales into voltages. The circuit was obtained from a...
The circuit shown was found in a 1994 Linear Applications Handbook by National Semiconductor. The...