Having found that the only two slotted opto-couplers in the miscellaneous draw were faulty, I managed to cobble together one that functions out of bits of the broken ones. It is amazing how this quick ...

Having found that the only two slotted opto-couplers in the miscellaneous draw were faulty, I managed to cobble together one that functions out of bits of the broken ones. It is amazing how this quick ...