Search found 22 matches
- Wed Nov 28, 2007 11:43 am
- Forum: General Discussion
- Topic: Cold Heat Soldering Iron, the Verdict is in...
- Replies: 24
- Views: 10697
- Sun Nov 18, 2007 1:03 pm
- Forum: General Discussion
- Topic: Rare earth magnets are sold as a fix or cure for everything!
- Replies: 11
- Views: 4844
I can vouch for the water softener. I once lived in a very hard water area where it was necessary to descale the kettle once a week because of limescale buildup. I bought one of these devices - Swedish made - after reading good reports of it. Sure enough it worked. But not by softening the water in ...
- Sun Oct 28, 2007 4:33 pm
- Forum: General Discussion
- Topic: Water Boil Detector
- Replies: 55
- Views: 34817
We have a Panasonic microwave oven that automatically cooks vegetables. You put any quantity of vegetables in a container and switch on. A humidity sensor acts when the temp is up to boiling point by measuring the water vapour given off. The program then calculates from the elapsed time how much lon...
- Thu Sep 20, 2007 12:58 am
- Forum: General Discussion
- Topic: Anyone else here charge/test batteries quite often?
- Replies: 12
- Views: 5932
THis link is the next best to an encyclopedia on the subject.
http://www.batteryuniversity.com/parttwo-33.htm
http://www.batteryuniversity.com/parttwo-33.htm
- Wed Nov 15, 2006 3:15 pm
- Forum: General Discussion
- Topic: 555 timer headaches!
- Replies: 31
- Views: 12848
I think you have a faulty 555. When pin 6 reaches 2/3 of V+, an internal bistable flips over and switches on the discharge transistor whose open collector is connected to pin 7. With pins 6 and 7 joined, this should discharge the cap connected to pin 6. When pin 2 triggers, the bistable flips back m...
- Sat Jul 15, 2006 10:32 pm
- Forum: General Discussion
- Topic: another capacitor question???
- Replies: 50
- Views: 22155
- Sat Jul 15, 2006 12:22 am
- Forum: General Discussion
- Topic: another capacitor question???
- Replies: 50
- Views: 22155
- Wed Jul 12, 2006 12:08 pm
- Forum: General Discussion
- Topic: another capacitor question???
- Replies: 50
- Views: 22155
- Sat Mar 11, 2006 2:57 pm
- Forum: General Discussion
- Topic: What temp?
- Replies: 6
- Views: 2886
Re: What temp?
Originally posted by Dean Huster: The best iron I've ever used is a tiny, 15-watt, non-temperature-controlled Antex (made in the UK) iron. Gets hotternell idling, but there isn't hardly any joint short of ground planes that you can't use it on. Seems to me the last one I saw in a catalog was $50 or...
- Mon Feb 27, 2006 2:53 pm
- Forum: General Discussion
- Topic: Mechanical equivalent of impedance matching?
- Replies: 10
- Views: 7158
Re: Mechanical equivalent of impedance matching?
Simple lever.
- Tue Dec 13, 2005 3:22 am
- Forum: General Discussion
- Topic: deciBel miliWatt...
- Replies: 7
- Views: 3498
Re: deciBel miliWatt...
Hi Miguel, "..If a source generating 0.775 V of audio has 600ohms source impedance, and is terminated or loaded with 600ohms, there will be 0.775V across the load and is called 0dBu, and ALSO 0dBm.." Not so. I am not familiar enough with dBu to know whether an unloaded voltage is implied, ...
- Mon Dec 12, 2005 2:57 pm
- Forum: General Discussion
- Topic: deciBel miliWatt...
- Replies: 7
- Views: 3498
Re: deciBel miliWatt...
Strictly speaking, the dB is the unit of measurement of Power ratios, (the Neper is a similar unit for voltage or current ratios). Modern practice has allowed a suffix, ie 'm' or 'W' to indicate absolute power levels. So 0dBm is a power level of 775mV across 600 ohms. The source impedance is irrevel...
- Sun Oct 30, 2005 5:13 am
- Forum: General Discussion
- Topic: Frequency to voltage conversion...
- Replies: 8
- Views: 3954
Re: Frequency to voltage conversion...
You could use an XOR or XNOR gate. Feed the waveform direct to one input and via an RC network to the other. You get a fixed width pulse out every time the waveform changes polarity. Then integrate the pulses and measure their mean level.
- Thu Sep 29, 2005 3:55 pm
- Forum: General Discussion
- Topic: Go stand in the corner, Chris
- Replies: 74
- Views: 33439
Re: Go stand in the corner, Chris
Why, when I read this thread, am I reminded of my pet puppy that yapps all day for no reason at all?
- Thu Aug 04, 2005 1:21 am
- Forum: General Discussion
- Topic: three phase transformer
- Replies: 8
- Views: 4294
Re: three phase transformer
Thanks Steven. It makes sense now.