mzzj
Newly Enlightened
In case someone didnt notice this on reviews-thread:
mzzj said:Turn-on voltage varies from unit to unit because Elly uses mosfet as a switch and mosfet gate treshold voltage is always bit "random". I have one that starts at 0.9v and another starting at 1.1v.
There is a trick to modify Elly driverboard to start reliably every time with less than 0.8v input, all you need is NPN-transistor and one 1k resistor
Connect NPN transistor parallei to Q1. It's very difficult if not impossible to manufacture mosfets with gate treshold voltages below 1v, but ordinary NPN transistor works already with 0.7v!
Emitter goes to Q1 upper pin. (Hold driverboard with inductor upwards.)
Collector goes to Q1 middle pin.
Base connected with 1k resistor in series to Q1 lowest pin
I used BC337-40 transistor but any fairly similar transistor should work. Something "around" 10-100v, 50ma-1A and HFE more than 100.