It is finally confirmed as to what this item is. It's an Electrolytic Tilt Sensor, not a switch, but a sensor in that the resistive fluid surrounds more or less of each pin, depending upon the angle deviation from 'normal'. When perfectly upright, the resistances between adjacent pins are all equal, as are equal the diagonal corner to corner resistances.

The amount of variance in resistances measured in the upright position is very small but this is calibrated for in the electronics part of the sensor at the factory so they are very accurate.

Some uses are for measuring tilt on scissor lifts, laser levels, and other things which must be kept upright or at a prescribed angle. Fredericks Company is one manufacturer of the devices.

If there's a good side to this ending, it's the plethora of parts that will eventually be available to others trying to keep their 300J, 20V-2, or 21E going into the future. I'm taking the extra time to remove pretty much anything of use down to harnesses and cable clamps, even hardware - as evidenced by the photos below.

In response to inquiries made, I will say that for now I'm not offering anything for sale due to time constraints with the upcoming move. However, if you're local or plan to be in the Charlottesville/Richmond are (we're halfway between) I'll be happy to let you haul off stuff like iron etc. Less for me to move.

So the deed is done or, at least - begun.

First load to the metal recycler consisting of small access doors, rear ventilation panels, power supply lower panel and one large front panel.

One more front panel to complete along with the rear hinged access doors before moving on to the cabinets/chassis themselves. Should have that completed by the weekend, then on to the chassis.

Looking forward to it!

Look for the bright orange sweater and hat.

See you there!

  Well, it seems that we're usually preparing for questionable weather but hoping for the best, but this time it looks great for both days. Hopefully that's not a bad omen.
  It'll be interesting this time around, with the Thursday/Friday thing, but I'm anticipating a fine turnout, particularly on Thursday. The only drawback for me will be dealing with work-day commuter traffic on both days, rather than just one day.
  I'll be going up with a friend tomorrow, bright and early, and then going up again with my wife on Friday with her usual spread of crocheted items for sale. On the way home I'll be taking her out to the Town Cabin Pub in Candia (taking the wife out to dinner is part of the deal, even though she'll be the one making money at the 'fest).

Ok thats great .....
Seems like your organised now and can proceed with the build....
Your PWM will work fine into those loads....

Let us know how things work out....


Wayne

I revised the design after discovering problems with the initial design. Adjust the drain impedance to 12.6Ω to suit the PWM modulator. Also increase the number of MOSFETs to 12 to amortize the increased current.

thank you very much for your help.

I just realized that the MOSFET Coss entry in the LU5HAH calculator only calculates the Coss of one MOSFETs. If you use more MOSFETs in the actual design, you need to subtract more Coss yourself.

I plan to make an impedance transformation transformer and choke using 28B1020-100 cores.