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Search found 548 matches
- Fri Aug 14, 2009 7:05 pm
- Forum: General Discussion
- Topic: Les Paul passes away at 94
- Replies: 11
- Views: 5858
- Wed May 06, 2009 5:53 pm
- Forum: General Discussion
- Topic: Need small monitor for TL system
- Replies: 12
- Views: 4556
Re: Need small monitor for TL system
I agree.. And that would allow him to buy an even cheaper monitor. OK, I agree too, if the price of the VGA to NTSC converter plus the price of a small (5" to 7") LCD flat panel NTSC video monitor is less than $199.00 . The dollars are in the monitor. What a shame when hundreds, if not th...
- Thu Apr 16, 2009 11:59 am
- Forum: General Discussion
- Topic: Need small monitor for TL system
- Replies: 12
- Views: 4556
Re: Need small monitor for TL system
Thanks Miguel. That would be about the size, but the MacMini does not output NTSC. The camera does not either, it is basically a webcam that hooks directly to firewire. I need a monitor with VGA or better input.
- Thu Apr 16, 2009 6:18 am
- Forum: General Discussion
- Topic: Need small monitor for TL system
- Replies: 12
- Views: 4556
Need small monitor for TL system
Using a spare Mac Mini running free Gawker time-lapse software and a firewire Orange Micro camera I have assembled a workable, and quite portable, security TL system. The problem is a monitor. Need one to set up the system but it should be small, in the order of a 5 to 7 inch model to maintain porta...
- Sat Feb 14, 2009 10:38 am
- Forum: General Discussion
- Topic: LED Street Lights Unvieled In Silicon Valley
- Replies: 15
- Views: 6557
Re: LED Street Lights Unvieled In Silicon Valley
Several years ago Birmingham replaced incandescent bulbs in all traffic lights with LEDs. Now I notice a number of the LEDS are dark. I suppose the fix, if/when necessary, is to replace the entire array rather than individual LEDs
- Wed Jan 07, 2009 6:56 pm
- Forum: General Discussion
- Topic: Ultra Violet and Infrared question...
- Replies: 10
- Views: 4289
- Mon Dec 22, 2008 2:28 pm
- Forum: General Discussion
- Topic: Ignition buzz filter
- Replies: 8
- Views: 3370
Ignition buzz filter
My son has a problem. He has been through two DC-DC converters to power an iPhone that connects to a built in MP3 input jack in his recently purchased Mazda. He is now hearing ignition buzz that used to not be there when he had the old Volvo. (that’s why he bought a second adapter thinking the fir...
- Thu Dec 04, 2008 7:25 pm
- Forum: General Discussion
- Topic: WHITISH COATING ON HANDLES OF NUT DRIVERS IN STORAGE?
- Replies: 6
- Views: 2927
- Wed Dec 03, 2008 6:11 am
- Forum: General Discussion
- Topic: current mirror circuits
- Replies: 4
- Views: 2400
Why wouldn't it be so? A current mirror is a circuit technique that can be build with either sex transistors. Yes, I see that now. I was just curious to know why more examples on the web (at least ones I find by Googling) are of the current sinking variety. To put it another way, in circuit design,...
- Mon Dec 01, 2008 6:50 pm
- Forum: General Discussion
- Topic: current mirror circuits
- Replies: 4
- Views: 2400
current mirror circuits
My favorite technical reference is Horowitz and Hall (second edition), so for those of you who have a copy, look up the current mirror circuits in chapter two. Notice that they are all built around PNP transistors and show them sourcing a load. Now when I Google “current mirrorâ€
- Sat Nov 29, 2008 4:54 pm
- Forum: General Discussion
- Topic: sump pump monitor
- Replies: 26
- Views: 10818
Unless I've miss-read your description that configuration is a CGFI sensor, not a current sensor. Maybe so, but my objective was met, a way to detect when a device plugged into a wall AC outlet is on or off and to do it without modifying wires between the source and the appliance and, preferably, w...
- Fri Nov 28, 2008 6:09 pm
- Forum: General Discussion
- Topic: Calculate time constant with a CCS
- Replies: 20
- Views: 8029
Thanks evahle, I have re-sent the PM and look forward to reading your article. The need for the formula was based on my wanting to design a ramp generator around a schmitt trigger using a CMOS inverter, 74c04 or 132 or equivalent. The formula for PPS for this very simple and often published pulse-ge...
- Fri Nov 28, 2008 2:26 pm
- Forum: General Discussion
- Topic: Calculate time constant with a CCS
- Replies: 20
- Views: 8029
- Fri Nov 28, 2008 2:20 pm
- Forum: General Discussion
- Topic: sump pump monitor
- Replies: 26
- Views: 10818
Not finding the answer I have been looking for I just built an experimental current sensor with off the shelf items that does not require interrupting a leg of the power source. Ultimately I hope to use it as part of a monitor system the pump in the basement. Although not finished, here’s the basi...
- Thu Nov 27, 2008 4:27 pm
- Forum: General Discussion
- Topic: sump pump monitor
- Replies: 26
- Views: 10818
OK Robert, you’re saying you have a clamp-on that if clamped around a regular power cord from a plug in 5 amp motor that you would get a reading? Sounds like if the clamp part was lopped off and attached to an opamp with relay and suitable circuitry then spindown could have the monitoring system h...