I've got an AC circuit that draws about 2A. What I need to do is cut the power to the device should a transistors heat sink overheat (defined as >100C). Preferably until the user unplugs the unit, or at least until it cools down some amount (20C?). It should be resettable, not permanent...
I'm not very familiar with thread forming screws (not to be confused with thread cutting screws)
How do you find the appropriate drill size for these? I want to attach two thick aluminum plates together, quickly, without having to tap holes. They seem like the best method, but these "odd"...
Here's the problem.... I have a load that varies from 76 to 120VDC, but always needs a constant 0.7A. I figure "okay, no problem, just need to rig up a constant current source for 120Vac use".... In the interests of keeping costs and parts counts low, I decided an NPN current source might be the...
Is there a way to calculate the danger like they do with lasers? I have 18 watts worth of LED's in a reflector. I know it is extremely bright, and looking at it directly for a split second will cause "floating images" in my vision for a few minutes.
So I know it's not good to look at, but...
Okay, wheel sensor detects rear wheels are slipping on acceleration. (You floored it from a stop in slick conditions) On the newer engines with electronic throttles, they can just close the throttle a little bit... but if you have a mechanical throttle, how do you reduce engine torque enough...
Hi everyone,
It's been a while since high school chemistry class, so I wanted to get your input on some things...
I read on the net about a new "cheap" way to etch PC boards. What you do is you mix 1 part Hydrochloric acid (the 30% pool supply stuff) with 2 parts Hydrogen Peroxide (the 3%...
I have a small 8" x 8" x 3" fiberglass/wood/bondo piece that I want to turn into plastic. It has to be done with an injection mold due to the various angles involved, and it's mostly hollow. Walk me through what I would need to go from prototype to product...
-I have a proto I can take...
Hi all,
I have a car body panel that I would like to make out of ABS plastic. It is approximately 25" x 25" x 3-5" deep. I have the plug ready to go, but now I don't know what I need to do next.
Since it is such a large part, I don't think making a mold out of aluminum or anything will be...
Okay, so I have this Mitubishi/Dodge tachometer with a Denso/Nippondenso SE094 IC, which is an air coil driver in a "similar" style as LM1819. However, the components are different, and I can't find anything close to the charge pump circuit that is used there.
I need to find a datasheet for...
It looks like an "ND" with the N and D sharing a leg. The rest of the numbers are SE094 and 6L21. It is an air core meter driver of some sort, that I'd like to pull the datasheet for. I've searched through hundreds of IC manufacturer logos, and haven't seen this one (or I missed it). I'm...
I was wondering if there was a way to chemically remove the identification off ICs, as a method to prevent (discourage) reverse engineering? I know I could sand it off, but that takes time, and just looks bad. Ideas? I've tried brake fluid and brake cleaner... I'll just keep throwing things...
I was kind of shocked to hear these two recordings of an LS1, one in a C5 vette, and the other in an LS1 F-body.
The F-body has the typical "muscle car" sound:
http://www.corsaperf.com/cfflash.html
But the C5 has an almost exotic (Ferrari-esque) sound:
http://www.corsaperf.com/flashc5.htm...
I've been investigating how I can improve the heads on my Northstar (cadillac 4.6L 32 valve V8) engine. Obviously one of the first things that comes to mind is porting. But one of the engineers that worked on the northstar had something different to say about the subject:
So obviously 9/10...
