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Sci.Electronics.Basics


Sci.Electronics.Basics is a worldwide Usenet news group that is used to discuss basic electronics questions.

There are 4623 threads in our archives.

You are looking at page 16 of 463.

The threads with the newest articles are listed first.

How supply power for changing number of LED? [12 articles]

-dave- - 2009-11-13 23:59:00
A friend wants to use some LEDs in something she is designing. She may use 5 LEDs or she may use 20 LEDs. It may even turn out she uses 50 LEDs. Would the resistence of the dropping resistor ne...How supply power for changing number of LED?

AC DC Power supply [5 articles]

Uriah - 2009-11-13 13:39:00
I need to power a Bill Changer acceptor. This is just the part the accepts the bills. It requires +5VDC, +12VDC, -12VDC AND 6VAC. These voltages all have the same single ground wire. How do I rec...AC DC Power supply

Did a BT135 SCR exist? [8 articles]

pimpom - 2009-11-13 03:51:00
I live in a remote place where it's often impractical to try to get the exact part I want, either for replacement or for a new project, and that was even more so 15-20 years ago when I was still...Did a BT135 SCR exist?

SMPS for audio amps [13 articles]

pawihte - 2009-11-12 20:10:00
This is probably a silly question with an obvious answer to those who know: Why are audio amplifiers seldom powered with switched-mode power supplies? The common exceptions I know of are in case...SMPS for audio amps

Ultra-powerful headlamp using LEDs? [11 articles]

John Doe - 2009-11-12 00:45:00
I am looking to make or buy an ultra-powerful head/helmet lamp for nighttime in-line skating. It requires lots of light for safety reasons and because skate wheels are small and tend to trip on ...Ultra-powerful headlamp using LEDs?

Design of Electronic Vehicle Anti-theft Gadget

Dan - 2009-11-11 17:46:00
See http://www.youtube.com/watch?v=FFb5_mKfnR8 for details ...Design of Electronic Vehicle Anti-theft Gadget

Connect 36 volt battery to an ordinary 120V household lightbulb? [8 articles]

John Doe - 2009-11-10 23:26:00
Should a 36 volt lithium-ion battery be connected to an AC lightbulb? Will that produce a dimmer light? Will it use less electricity than a normal 36 volt flashlight bulb? I have some 36 volt co...Connect 36 volt battery to an ordinary 120V household lightbulb?

What is the symbol for a mic? [51 articles]

Eddie - 2009-11-10 20:53:00
I want to write (by hand) if some voice recordings of mine are in mono or stereo. Are there some standard symbols used for a mono mic and a stereo mic? Are there mono/stereo mic symbols us...What is the symbol for a mic?

PG&E Wants Rate Hike for Efficient Energy Users [6 articles]

Michael - 2009-11-09 22:59:00
It's a little early for April Fools jokes... http://www.sfgate.com/cgi-bin/blogs/inthemission/detail?entry_id=51129&tsp=1 -- Darrett Computer Repair Serving the Sacramento area. Free estimate...PG&E Wants Rate Hike for Efficient Energy Users

Connect microphone to powered computer speakers? [3 articles]

John Doe - 2009-11-09 17:00:00
Is there a low noise (not necessarily audiophile quality) OEM amplifier that can be used to power an electret microphone for connecting to powered computer speakers? Are there other solutions fo...Connect microphone to powered computer speakers?
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