This circuit was found in a 1992 publication. What it does is to light an external lamp when it gets dark. The trigger point adjustment is made in a potentiometer or trimpot and the sensor is a common LDR.
Using transistors at the time, this circuit was found in a 1967 Ferranti documentation. The...
This circuit provides voltages and a 1 kHz signal for measurement bridges. The circuit is from...
We found this oscillator in an integrated circuit manual from the 90's. The circuit shows how to...