See below, but you should have a current limiter on the input.oden wrote:Pin 1: + 5.5 Volt generated by a MC7805 for testing
Pin 2: Fan's ground wire
Pin 3: Ground
You might want to re-read. 100k from gate to ground, 100 to 1000 ohm (0.1k to 1k) from gate to 5v.As suggested I tied running a 100K then 200K resister between pin 1 and the 5V supply but the MOSFET would not power up.
Measure the voltage across pin 2 and 3, if there is a large drop, compare current with voltage with RDS on and see if they match. If they do, then it's OK. If they don't, then something is wrong. What is RDS?As is the fan runs at 9.4 Amps draw (rated as 12 A). When the MOSFET is added the current draw drops to 8 Amps, understand its normal for a loss but is this to high? The fan speed is noticeably slower.
I wrote most of this 13.5 hours ago, but fell asleep, woke up having missed doing something i was supposed to, rushed to other machine, and forgot about it.
Sorry for the delay.
Fred.