Found in a 1968 Novel Electronics Circuit, this circuit compares two light intensities using common LDRs as sensors. Transistors can be modern PNP equivalents.
For analog lines, this circuit was found in the August 1994 issue of Electronics Now magazine. The...
This low-noise hydrophone circuit was found in a 1980s Linear Technology component manual. The...
This circuit is from an Electronic Design of the 90's. The circuit can be implemented with more...