Well finally got the latest revision hooked up but have a problem. When trying to turn the display on with the remote, all steps in the circuitry for the toggle seem to work but the display doesn't light up.
At the FET, the gate voltage toggles between zero and 12 volts as it should when alternately pressing the remote key, but I'm finding only about 9.5 VDC on the "source" pin (the one connnected directly to the LED anodes. The "drain" is tied directly to the 18vdc source.
I first had the drain and source leads reversed and then corrected that. Thinking I may have damaged the first FET, I plugged in a spare I had purchased at the same time but still no change... just 9.5vdc on the source pin. I can jumper source and drain and, of course have my full 18vdc on the LEDs and normal display with the up, down and reset functions via remote behaving fine.
Not sure what to expect on an FET but should it normally turn fully on so that drain and source voltages are nearly equal? Thanks for your advise !
At the FET, the gate voltage toggles between zero and 12 volts as it should when alternately pressing the remote key, but I'm finding only about 9.5 VDC on the "source" pin (the one connnected directly to the LED anodes. The "drain" is tied directly to the 18vdc source.
I first had the drain and source leads reversed and then corrected that. Thinking I may have damaged the first FET, I plugged in a spare I had purchased at the same time but still no change... just 9.5vdc on the source pin. I can jumper source and drain and, of course have my full 18vdc on the LEDs and normal display with the up, down and reset functions via remote behaving fine.
Not sure what to expect on an FET but should it normally turn fully on so that drain and source voltages are nearly equal? Thanks for your advise !