Found in a 1965 General Electric Hobby Manual, this timer was originally created to operate with photo magnifiers of the time. The circuit can be adapted for other purposes.
This shield can be controlled by positive or negative voltages of the sensor acting as a...
This circuit is from a 1980s Signetics documentation. Equivalent operational amplifiers may be...
This circuit was found in an Electronics World of 1969. Transistors are general-purpose types. It...