Getting 0.49v drop across IRFZ44N MOSFET on heatbed... So I beefed up the v1.3 boards circuit with solder for both the molex to the source of the mosfet, from the drain to the new screw terminal and from the positive on the molex to the screw terminal. And I am still measuring almost half a volt drop across the source to drain on the mosfet. This means my heatbed struggles to get to 105 degrees. I have been told the IRLB8743 is a better option but I can't find any in Australia and the only ones I can find online come from Hong Kong (just recently things have been taking over a month to arrive from China). So my question is will this MOSFET upgrade solve my voltage drop? And what is a reasonable voltage drop across a MOSFET that is at 60 degrees (fan cooled with heat sink) and handling heatbed amps? https://reprap.org/forum/read.php?181,179880,179880#msg-179880 Mon, 14 Sep 2026 01:38:40 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?181,179880,181341#msg-181341 Re: Getting 0.49v drop across IRFZ44N MOSFET on heatbed... https://reprap.org/forum/read.php?181,179880,181341#msg-181341 Phizinza Next Wave Electronics Working Group Sat, 02 Feb 2013 02:46:48 -0500 https://reprap.org/forum/read.php?181,179880,180516#msg-180516 Re: Getting 0.49v drop across IRFZ44N MOSFET on heatbed... https://reprap.org/forum/read.php?181,179880,180516#msg-180516 Annirak Next Wave Electronics Working Group Wed, 30 Jan 2013 09:08:14 -0500 https://reprap.org/forum/read.php?181,179880,180395#msg-180395 Re: Getting 0.49v drop across IRFZ44N MOSFET on heatbed... https://reprap.org/forum/read.php?181,179880,180395#msg-180395 australia.rs-online.com]

Hoping they will work, looks all the same as the other one but just higher amps..?]]> Phizinza Next Wave Electronics Working Group Tue, 29 Jan 2013 22:39:13 -0500 https://reprap.org/forum/read.php?181,179880,179919#msg-179919 Re: Getting 0.49v drop across IRFZ44N MOSFET on heatbed... https://reprap.org/forum/read.php?181,179880,179919#msg-179919
Quote

I have been told the IRLB8743 is a better option but I can't find any in Australia

How about this one? [australia.rs-online.com]

There are more MOSFET options going almost as good, see [reprap.org] .]]> Traumflug Next Wave Electronics Working Group Mon, 28 Jan 2013 07:29:16 -0500 https://reprap.org/forum/read.php?181,179880,179880#msg-179880 Getting 0.49v drop across IRFZ44N MOSFET on heatbed... https://reprap.org/forum/read.php?181,179880,179880#msg-179880 So my question is will this MOSFET upgrade solve my voltage drop?
And what is a reasonable voltage drop across a MOSFET that is at 60 degrees (fan cooled with heat sink) and handling heatbed amps?]]> Phizinza Next Wave Electronics Working Group Mon, 28 Jan 2013 04:34:37 -0500