Using circuits from Analog Devices, this circuit does not need a symmetrical power supply. It is also offset adjustable and is based on the LT1498 and LT1167 op amps.
We found this circuit in an old documentation from the 70s. The sensor is an LDR that must be...
This circuit with junction field effect transistors was found in documentation from the 1980s. The...
Common general purpose silicon diodes when direct biased provide a voltage fall of about 0.6 to...