Search found 59 matches
- Fri Dec 26, 2008 5:32 pm
- Forum: General Discussion
- Topic: LED light experimentation
- Replies: 22
- Views: 11660
Re: LED light methods
The 0402 don't make much light at all but I have some Kingbright 2.5X2mm smd rated at 2500 mC at 250 mA. That current rating is assuming the case temperature is held within the safe operating area. This will require a heatsink for any length of time over a few seconds, and / or to keep the temperat...
- Tue Dec 23, 2008 6:37 pm
- Forum: General Discussion
- Topic: battery jumper kit
- Replies: 10
- Views: 4141
Oops. I was unclear. I use the (oversize) battery in my car. A small 12AH one wouldn't do the instant jump. I have mostly used the jumper cables to start other cars... or trucks. The 2 best ways to avoid needing a jump are: 1. Replace the battery before it is at end of life - 5 years for flooded cel...
- Tue Dec 23, 2008 4:20 pm
- Forum: General Discussion
- Topic: battery jumper kit
- Replies: 10
- Views: 4141
- Mon Dec 08, 2008 6:54 pm
- Forum: General Discussion
- Topic: Rotary tool Opinions
- Replies: 17
- Views: 6803
One advantage of the flex shaft unit is the motor is significantly bigger - no bogging down, etc. Depending on what you are doing, you have to find a place to lay or hang the motor. I used a cheap motor control / triac phase control for speed control, now use a 25Watt Variac, just because it's nicer...
- Fri Dec 05, 2008 5:53 pm
- Forum: General Discussion
- Topic: Rotary tool Opinions
- Replies: 17
- Views: 6803
- Mon Dec 01, 2008 7:44 pm
- Forum: General Discussion
- Topic: current mirror circuits
- Replies: 4
- Views: 2398
- Sun Nov 16, 2008 4:58 pm
- Forum: General Discussion
- Topic: Auto Audio from the past Concord HPL 130
- Replies: 24
- Views: 10448
- Sat Nov 15, 2008 8:44 pm
- Forum: General Discussion
- Topic: Auto Audio from the past Concord HPL 130
- Replies: 24
- Views: 10448
- Sat Nov 15, 2008 7:25 pm
- Forum: General Discussion
- Topic: Auto Audio from the past Concord HPL 130
- Replies: 24
- Views: 10448
- Wed Oct 29, 2008 4:25 pm
- Forum: General Discussion
- Topic: ANTS ANTS ANT !!!
- Replies: 39
- Views: 11889
- Wed Oct 29, 2008 2:44 pm
- Forum: General Discussion
- Topic: ANTS ANTS ANT !!!
- Replies: 39
- Views: 11889
- Thu Oct 23, 2008 7:06 pm
- Forum: General Discussion
- Topic: HVAC design questions
- Replies: 17
- Views: 8402
#2 The thermostat systems I've seen have only a closure at the thermostat, no real way to get full time power from the wires available at the thermostat. Using a PC to power it would use a noticable amount of power - unless the PC is already on 24/7 for other reasons. For the temp sensor, be sure to...
- Thu Oct 23, 2008 6:48 pm
- Forum: General Discussion
- Topic: wall wart questions
- Replies: 12
- Views: 5236
If they are unregulated, the higher current one will have lower resistance. The rated voltage is given at rated load, so if you use it with a lower current, expect the voltage to be higher. Look up the model of the KVM switch, you might find reference to the power adapter. There are both types aroun...
- Wed Oct 22, 2008 3:43 pm
- Forum: General Discussion
- Topic: HVAC design questions
- Replies: 17
- Views: 8402
#1 Running an A/C less than a few minutes would mostly waste electricity. A delay or lockout from restarting too soon is a very good idea. The compressor can't start with backpressure. It takes a few minutes to equalize the pressure in the system. Maximum on isn't really a problem - if it is sized c...
- Tue Oct 21, 2008 3:37 pm
- Forum: General Discussion
- Topic: Cutting clean holes in enclosures
- Replies: 25
- Views: 9891