Found in a 1968 Novel Electronics Circuit, this circuit compares two light intensities using common LDRs as sensors. Transistors can be modern PNP equivalents.
With this timer we can start between 30 seconds and one and a half seconds, time set in the pot....
Texas Instruments REF33x Voltage References can be obtained from Mouser Electronics. These small...
Found in an Electronics World of 1966 this circuit can be made with current power transistors. It causes...