I have permanently connected it to an old meter box containing a current meter switchable between 20 and 200 MA FSD, and an isolating diode. Note that the meter is labelled "Dosage": it is from an Electro-Convulsive Therapy machine which was discarded in the 1960's!
This combination may be used by itself, usually with a lead-acid battery, or with the Current Limiter, which is the smaller box on the left in the photograph.
The circuit board for the Current Limiter was originally packaged with a large re-cycled power supply for a different dedicated battery charger. This worked, but I considered it ugly, and re-packaged it in its current form. But later I put it aside as being overkill for that application and replaced it with resistors and a relay.
It was modifiied slightly for the Solar Charger to connect the battery to be charged via binding posts, and to insert a shunt resistor so that the Charge Controller can measure the charging current. It can be used with or without the Charge Controller.
The Charge Controller is an all-new unit whose purpose is to cut off charging when a selectable number of ampere-hours have gone into the battery.
The photo at the bottom is of a battery holder and a 434 MHz transmitter which connects to the DA9S socket pins 2,5 and 6, which has +5V power for it
The components of the System Diagram below are described beginning in the next page for the Current Limiter.
