man "it can't be done"
woman "it must be done"
It get's done!
Search found 309 matches
- Sun Dec 18, 2005 5:00 pm
- Forum: General Discussion
- Topic: solarenergyandbeyond
- Replies: 16
- Views: 8297
- Fri Dec 16, 2005 1:39 pm
- Forum: General Discussion
- Topic: solarenergyandbeyond
- Replies: 16
- Views: 8297
Re: solarenergyandbeyond
If you burn fuel in some type of engine and use the output power to generate electricity you get a very efficient return on your fuel. Most engines waste around 80% to the exhaust and cooling system. That heat can be recovered to heat your house. The electricity can be used in the house and ultimate...
- Wed Dec 14, 2005 6:00 pm
- Forum: General Discussion
- Topic: What Tools Are Really For
- Replies: 6
- Views: 3109
Re: What Tools Are Really For
The trouble light is the most appropriately named item. When it is lighted it is usually shining in your eyes or burning your arm. When you finally get it positioned it falls and the bulb goes out. Big Trouble!
- Sun Dec 04, 2005 3:37 am
- Forum: General Discussion
- Topic: circuit to energize a relay for 30 seconds
- Replies: 5
- Views: 3240
Re: circuit to energize a relay for 30 seconds
Do you intend to have the water circulate at intervals so it's always hot? You haven't mentioned what you want to trigger the circuit. A thremostat may be a better fix.
- Sat Dec 03, 2005 3:38 pm
- Forum: General Discussion
- Topic: "Perfect" LED current limiting challenge
- Replies: 255
- Views: 216179
Re: "Perfect" LED current limiting challenge
You may run into problems with this circuit because the pwm circuit averages high current bursts in time. If you use a constant current circuit on the end of it as a safety valve it will probably limit the bursts and kill your efficiency.For what it's worth you need to limit the voltage between the ...
- Sat Dec 03, 2005 11:41 am
- Forum: General Discussion
- Topic: Work formula...
- Replies: 6
- Views: 3138
Re: Work formula...
If you multiply watts times seconds you get watt-seconds. One watt-second is the same as one joule. Work and energy have the same definition so you're good to go in both cases.
- Fri Nov 25, 2005 4:45 am
- Forum: General Discussion
- Topic: Radio Shack pulling a scam???
- Replies: 4
- Views: 2820
Re: Radio Shack pulling a scam???
Sounds like Bushnell is scamming RS.
- Thu Nov 10, 2005 7:21 pm
- Forum: General Discussion
- Topic: led indicator light
- Replies: 2
- Views: 1827
Re: led indicator light
Put the led in series with a resistor of around 600 to 1000 ohms. The flat side of the led goes to ground. The resistor goes from the positive (same wire that's going to the lights) of the switch to the round side of the led.
- Wed Nov 09, 2005 3:34 pm
- Forum: General Discussion
- Topic: oh for a reliable button
- Replies: 10
- Views: 4077
Re: oh for a reliable button
http://content.honeywell.com/sensing/pr ... cswitches/
I heard a story about a P-40 (crashed ww2 aircraft)that was recovered from the jungle after 40 years. The micro switch on the landing gear still worked.
I heard a story about a P-40 (crashed ww2 aircraft)that was recovered from the jungle after 40 years. The micro switch on the landing gear still worked.
- Sun Nov 06, 2005 8:13 am
- Forum: General Discussion
- Topic: Simple question from a simple guy
- Replies: 9
- Views: 4737
Re: Simple question from a simple guy
If it's ignored why are you commenting on it?
In the past a majority has supported zero tolerance for any off color subject matter. Our more respected "contributors" should be setting the example.
In the past a majority has supported zero tolerance for any off color subject matter. Our more respected "contributors" should be setting the example.
- Sun Nov 06, 2005 3:32 am
- Forum: General Discussion
- Topic: Simple question from a simple guy
- Replies: 9
- Views: 4737
Re: Simple question from a simple guy
"Puhleeeez tell me….Why...(gone and forgotten quote)
Perhaps it's not about You!
Certainly no place for this here.
<small>[ November 07, 2005, 04:03 PM: Message edited by: josmith ]</small>
Perhaps it's not about You!
Certainly no place for this here.
<small>[ November 07, 2005, 04:03 PM: Message edited by: josmith ]</small>
- Sat Nov 05, 2005 2:28 pm
- Forum: General Discussion
- Topic: Simple question from a simple guy
- Replies: 9
- Views: 4737
Re: Simple question from a simple guy
In a word yes they should react like batteries adding voltage in series and adding current in parallel. Other than Ed’s explanation that you messed up the polarity they should have. The three volt rating needs a speed associated with it since voltage and speed are directly proportional on p.m. motor...
- Sun Oct 30, 2005 4:49 pm
- Forum: General Discussion
- Topic: does anyone share my amazement...
- Replies: 16
- Views: 6291
Re: does anyone share my amazement...
How can anyone spel wright if they don't set a gud
ezample.
ezample.
- Fri Oct 28, 2005 7:40 pm
- Forum: General Discussion
- Topic: Frequency to voltage conversion...
- Replies: 8
- Views: 3957
Re: Frequency to voltage conversion...
It depends on what you call "simple". A basic stamp can read very low frequency in period mode or higher using it's pulse in function. Output the result as a voltage with the pwm function.
YOu can make a charge pump with two diodes two capacitors and a resistor.
YOu can make a charge pump with two diodes two capacitors and a resistor.
- Tue Oct 25, 2005 2:50 pm
- Forum: General Discussion
- Topic: lower than 40 degree thermostat
- Replies: 6
- Views: 3203
Re: lower than 40 degree thermostat
Ouchie on those prices. Dewyer/love controls has one for around 50 bucks.