Basics
in [Electronics]
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Current limiting for LEDs (was Re: Use 14.4V NiCad battery through a L7812 regulator?) ehsjr <ehsjr(a)nospamverizon.net> wrote: LEDs are best driven by a constant current supply, That looks like a clue... Thanks. like the one drawn below. ----- +14.4 ---in|LM317|out---+ ----- | adj [R] | | ... 14 Dec 2009 23:13
Samsung Corby S3653 Price and Features Samsung Corby is love at first sight. The mobile represents all features in style. One can flick-on to other features through flicking of the mobile phone. It is one of the most classy and unique handset with advanced features at the display of users. Corby is Quad band with GSM of 850/900/1800/1900MHz. Through th... 7 Dec 2009 03:05
Use 14.4V NiCad battery through a L7812 regulator? I need to power three Cree XLamp XRE LEDs. The standard sealed lead acid battery is 12 V, but it is heavier than I would like to carry. I have some spare rechargeable 14.4 V DeWalt tool batteries. The L7812 regulator says it needs at least 14.5 V. will a 14.4 V NiCad tool battery be acceptable for that? Th... 10 Dec 2009 07:54
Cyborg Beetles http://www.greendiary.com/entry/solar-powered-cyborg-beetles-tested-for-spying-purpose/ ... 1 Dec 2009 17:17
SPDT debounce doesn't +5v +-----------------------------+---- | ____|________ +--o_ | | -_ 11| 74hc595 | -o--+-------------[| | | |____________| +--o === 100nF | | | ... 16 Dec 2009 23:32
photons and reflection According to the wave theory of light, angle of incidence equals angle of reflection. No problem, in theory or fact. However, per QM, light falls as a 'rain' of photons. What happens then? As I understand it (big qualifier there), the photons are absorbed by surface atoms. Electrons jump to higher energy orbi... 13 Dec 2009 00:21
Question about common-collector circuits. I remember reading a long time ago (I think it was a magazine article) a cautionary note about operating a common-collector BJT with the collector tied directly to the power supply rail. It recommended inserting a resistor between the collector and Vcc. What I don't remember is the reason given. The only thing ... 27 Nov 2009 21:08
anti spam technique? If you click on several of those spam clothes ads, they all have a similar 'looknfeel' with a live help window floating around. I've send a couple of messages back telling them that its futile to expect to get customers from a newsgroup that has been flooded with spam. A couple of them actually responded live and s... 2 Dec 2009 21:12
It's all BUSH-CHENEY and you dumbfucked American dickheads fault! For voting the idiots to run the country in the past...... "Phil Allison" <phil_a(a)tpg.com.au> wrote in message news:7mrrbfF3j22ncU1(a)mid.individual.net... "Dave" and wondering, if I am trying to put the gate at Vp or close thereto, is the voltage applied in referrence to the source voltage or ground? I am seriously considering putting the gate at gro... 26 Nov 2009 16:29 |