This circuit using only transistors was obtained from Ferranti's 1969 documentation. It can be made from modern transistors. The circuit is 4 bits.
The output voltage of this unit is approximately 1.4 V less than that of the chosen zener. The...
TDK's TAS Series Magnetic Angle Sensors can be obtained from Mouser Electronics. The components...
Found in a Popular Electronics from the 90s, this circuit checks the presence of voltage on a...