Hi, I hope someone has come across this problem before. I bought some of these MOSFET boards and I can't seem to get them to work. I have my power hooked up correctly, the heater on the output. I've checked the control PWM signal and polarity and its fine. My heater won't turn on, the red power LED lights and the blue signal LED. I measured with a voltmeter, I get around 0.6 volts across the heater terminals and about 2 volts on the gate of the mosfet. What am I missing? thanks! https://reprap.org/forum/read.php?219,890462,890462#msg-890462 Thu, 13 Aug 2026 22:55:58 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?219,890462,890470#msg-890470 https://reprap.org/forum/read.php?219,890462,890470#msg-890470 bart_dood RAMPS Electronics Wed, 07 Sep 2022 10:58:49 -0400 https://reprap.org/forum/read.php?219,890462,890463#msg-890463 https://reprap.org/forum/read.php?219,890462,890463#msg-890463
But this device is designed to augment existing mosfet ie signal is 12v or 24v, I do not know if it would work on a 5v digital signal, I though it did...

also check your 5v really is 5v, as mega2560 Voltage regulators die really easily.

Mosfet on voltage is 2.5v, (for the mosfet on the version of this board I have) so a low 5v on the mega would explane it]]> Dust RAMPS Electronics Wed, 07 Sep 2022 01:45:58 -0400 https://reprap.org/forum/read.php?219,890462,890462#msg-890462 https://reprap.org/forum/read.php?219,890462,890462#msg-890462
My heater won't turn on, the red power LED lights and the blue signal LED.

I measured with a voltmeter, I get around 0.6 volts across the heater terminals and about 2 volts on the gate of the mosfet.

What am I missing? thanks!]]> bart_dood RAMPS Electronics Wed, 07 Sep 2022 00:46:11 -0400