This circuit is from documentation from 1965. However, it can be created with modern transistors. Power comes from two 9 V batteries.
This optical pass-through shield can be used in various applications, such as object sensing or...
Equivalent transistors like the BC548 can be used on this 1969 Mullard circuit. The circuit has two...
This is the traditional configuration of an OR gate using a voltage comparator, but it can also be...