This timer for photography work was published in Radio Electronics magazine in December 1959. Power comes from the power grid through a transformer source.
This amplifier step with a transistor has an input impedance of 100k to 10 M. The transistor can be any...
This sensor circuit for currents of the order of nanoamperes was found in an American...
I found this circuit in a 1992 Electronics Experimenter Handbook. The circuit can be easily...