Tip: Any time you measure any semiconductor, always take the measurement
twice - swap the leads between the two.
Vince.
toggle quoted message
Show quoted text
On Tue, Dec 19, 2017 at 05:28 am, Gordon Gibby wrote:
2. ??Now that you've learned how to measure the total drawn current,
read
the directions and see if you can set the idle current on the Irf 510 in
transmit position. ?? >> ??Even with pops, flashes, and burning smells,
if
you can set that idling current, the device is still working!!!! ??<<.
If
the bias (gate voltage) potentiometer ??does NOTadjust the current at
all,
then yes, something is kaput.
Ok good... thanks. I finally feel like I'm starting to get somewhere with
this. I had measured the resistance between source and drain on the mosfet
and found that it was close to 0. That also led me to believe it's blown,
but I was reading up on it this morning and read that it depends on which
lead you use on which leg...that, if you use the wrong one, it will open
the mosfet and you will get close to 0 because it's working...not because
it's blown. So, I will go through this to see...I had measured before it
blew and after, but I may have measured with different leads on the legs.
--
Michigan VHF Corp.
