Found in a publication from the 50's, this circuit uses a germanium transistor of the time. The power supply is simple.
This circuit can monitor the charge and discharge of batteries. The circuit is from a Linear...
This circuit is from a 1965 Motorola documentation. The transistors are of the time as is the...
Is already availablefrom Mouser Electronics is the new reflective B5W-L01 sensor for convergent...