New diode testing design [2]

[continued from New diode testing design]

Each latched reed relays will be powered by a battery that is controlled by a phototransistor, which is controlled by a beam of light shining through a pin hole in the hammond shield. The phototransistor will be inside the Hammond shield. The LED that shines light on the phototransistor will be outside of the Hammond shield. The external LED will be connected to an external switch and battery. So momentarily pressing the switch, the latched reed relay will toggle.

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