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Dimming low power light bulbs

I know one can dim filament bulbs with triacs (or similar). I think I know that one used not to be able to dim fluoresc...
2 comments posted 13yrs
posted by freddywilliams
2 comments posted 13yrs posted by freddywilliams

Charge gel cell with car charger?

A friend has a battery powered Ryobi lawn trimmer ("weed whacker") which doesn't work. The 12vdc wall wart puts out onl...
32 comments posted 13yrs
posted by mcham
32 comments posted 13yrs posted by mcham

Crystal load?

I'm ordering a 2-pin crystal (8.86723 MHz) and need to specify the load. A little help calculating this, please? http://...
41 comments posted 13yrs
posted by invalid
41 comments posted 13yrs posted by invalid

PCB prototyping "short film"

That's me! http://www.youtube.com/watch?v=N6YoH88CDRo
0 comments posted 13yrs
posted by sstafford0707
0 comments posted 13yrs posted by sstafford0707

Powering 2 2.8V1.68A motors?

Afternoon all, I'm working on a project where 2 motors will drive string on either side of a pen to draw something on X...
2 comments posted 13yrs
posted by andrewmazzotta
2 comments posted 13yrs posted by andrewmazzotta

This is just funny

Bought a cheap PWM controller for a 24VDC motor off of Ebay for some $10. Besides an design that is either amateurish o...
1 comments posted 13yrs
posted by traykoff
1 comments posted 13yrs posted by traykoff

Crystal frequency for monochrome video signal?

80's vintage German printing equipment (offset press industry) uses a video plug-in card (made by the manufacturer of t...
4 comments posted 13yrs
posted by invalid
4 comments posted 13yrs posted by invalid

Dranetz 626 plug-ins

There are many different models of 626 power disturbance monitors, from the vanilla 626, and from the 626A through 626G...
0 comments posted 13yrs
posted by invalid
0 comments posted 13yrs posted by invalid

Electronic fireflies

My wife bought some of these and they are actually pretty cool but expensive for what they are. The operation is there...
2 comments posted 13yrs
posted by gfretwell
2 comments posted 13yrs posted by gfretwell

Can a JFET be used as a UJT?

The structure of a junction field effect transistor seems to be very similar to that of unijunction transistor. Schemat...
3 comments posted 13yrs
posted by SalmonEgg
3 comments posted 13yrs posted by SalmonEgg

Power mains question: wire gauge

Air compressor 1/2 hp motor rated 220v (2-wire, not 3-phase) @ 15A. Distance from load panel ~100 ft (as the conduit ru...
175 comments posted 13yrs
posted by invalid
175 comments posted 13yrs posted by invalid

Electrical Computer Programs Free

I am the author of about 30 programs. Some run in JavaScript others are Visual Basic 2010 Applications that run in Wind...
0 comments posted 13yrs
posted by johnhaines574
0 comments posted 13yrs posted by johnhaines574

How to read code from P87C750?

Obsolete data controller from defunct company uses this Philips ucontroller. Units are failing and customer has the opt...
36 comments posted 13yrs
posted by gwprez
36 comments posted 13yrs posted by gwprez

Wiring problem

Hello, I'm trying to change some light switches for PIW switches so they come on when my disabled brother walks into th...
13 comments posted 13yrs
posted by askforemail
13 comments posted 13yrs posted by askforemail