Design

Forward baised photodiode
Right, who would do such a stupid thing? This is for a piece of equipment that will be used by students. They get to hook up the photodiode and it's guaranteed that 1/2 of them will do it backwards the first time. (And the other half will do it backwards the second time.) The power supply that biases the PD is... 11 Jul 2010 02:56

AAA dummy battery
Does anybody know where I can purchase a AAA dummy battery (or many) online? thanks! Dawn http://TheCollectorDetector.net ... 11 Jul 2010 02:56

Types of diode-connected BJTs
On Thu, 8 Jul 2010 00:53:14 -0700 (PDT), C Egernet <egernet(a)hushmail.com> wrote: What are the relative merits of diode-connecting a BJT by shorting base and collector (using B-E junction) versus shorting base and emitter (C-B junction)? Na�vely, I have assumed that one always uses the B-E junction but the... 10 Jul 2010 21:31

Home Project, Mechanical Question...
Home Project, Mechanical Question... Moving 8' and 10' folding tables. It would be nice to have a one-wheel dolly to stick under one end (on edge, while folded-up), so I could wheel them around by myself. Any ideas, suggestions? ...Jim Thompson -- | James E.Thom... 10 Jul 2010 19:19

Sad and Scary
Sad and Scary... While waiting for my wife at the eye doctor's office I was reading the May 2010 issue of US News and World Report... Listing of best jobs for recent college grads: Only "engineering" listing was Computer Programmer :-( ...Jim Thompson -- | James E... 15 Jul 2010 15:25

Non linear amplifier output
Hi All, I am putting together a basic circuit to add 10X gain to the output of an LM34 temperature sensor (to feed a voltmeter). So have kludged together an op-amp in the classic non-inverting input configuration. (1+R2/R1) Single supply, 12V. The problem is that the output shows high linearity error. ... 9 Jul 2010 16:06

Intrinsic 1/f noise in ADCs and DACs
Having spent my career trying to keep clear of the low baseband, I now find myself needing to do very precise measurements of acceleration at very low frequencies--like 1 nano g (1 microgal, 10**-8 m/s**2) per root hertz at frequencies from 10**-4 Hz to about 100 Hz. This is an interesting ride, and will be ge... 9 Jul 2010 12:46

Repairing expensive speakers
I am repairing two 15" Tannoys of the Gold series. A $5k unit if we could get them. Un oscillation in a cassette deck I was using, produced a very lowed sound that damaged the speakers. One of them has 6 turns of the voice coil, lose and can be glued back. On the old days I used to repair speakers using the ... 10 Jul 2010 10:31

Vaporizing electrolytic caps a health risk ?
On 31/07/2008 11:56 AM, Jeff Liebermann wrote: On Wed, 30 Jul 2008 20:48:26 +0200, "Skybuck Flying" <BloodyShame(a)hotmail.com> wrote: Probably electrolytic caps - they are usually the first to fail; heat causes them to dry out. " Does this mean the fluid that is inside vaporizes ?!? Y... 11 Jul 2010 12:40

bread boarding taken a little too far
http://upload.wikimedia.org/wikipedia/commons/3/37/Dolby_SR_breadboard.jpg -Lasse ... 9 Jul 2010 08:20