This circuit using only transistors was obtained from Ferranti's 1969 documentation. It can be made from modern transistors. The circuit is 4 bits.
We found this circuit in the 1960 Mullard transistor reference manual. The phototransistor can be a...
We found this circuit in the June 1991 issue of Radio Electronics magazine. The integrated circuit is...
This is a configuration that can be used in analog calculations by adding and subtracting...