Spiff's Electronics Notebook: Search Results

Entries from Spiff's Electronics Notebook tagged with 'FET'

A bigger basic H-bridge (April 12, 2005)

We just don't do small. So when it came to choosing stepper motors, I picked nice beefy 2lb bipolar beasts. Driving these has, however, turned into a bit of a problem.

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FET H-Bridge Kit Optoisolator PCB PIC Transistors
Posted by spiffed at 8:20 PM

TO-220 Hole Screws (March 16, 2005)

The holes in the tabs of TO-220 bodies fit #6 metal screws.Conveniently, the standard screws used to hold PCs together are also #6 machine screws. Be forewarned though; the thread of "floppy screws" (also used on optical drives) are different from everything else. (The former being a finer pitch.) #6-32 nuts/bolts/screws in the length of your choosing will mesh nicely with their common PC counterparts.

If you're in a hurry, a large thumbscrew and a nut can almost double the continuous power handling capacity and more then double the peak capacity (greater thermal mass) of some transistors.

As usual, if you buy the nuts and bolts from your (or someone else's) local hardware store, it's usually cheaper then buying from electronics supply houses.

FET Transistors
Posted by spiffed at 11:11 PM

Biasing a FET (March 13, 2005)

So your building some sort of a N-MOSFET as a switch circuit, you wire the FET between the load and the ground (or source), then apply the source voltage to the gate, and the FET switches on a bit. Congratulations, your FET is incorrectly biased.

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FET Howto Transistors
Posted by spiffed at 1:55 PM