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alternating current [4 articles]
thamarai selvan - 11:37 02-04-08
why the AC current or vaoltage is represented in rms values ,why DC
current or voltage is represented so.
... Read More
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Heatsink calculation with limited data [4 articles]
allanlewis - 06:09 02-04-08
Hi,
I am using a modified version of the lighting controller circuit at...
http://www.edn.com/index.asp?layout=3Darticle&articleid=3DCA46649
=2E..and I'm not sure what heatsin... Read More
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rs232 question [3 articles]
malua mada! - 21:04 01-04-08
I have a controller that talks rs232 ,driven by a MAX232.
3 wires only.
I connect the computer to it: works fine.
I am connecting a StarTech NETRS2321E Net adapter to it. Won't ... Read More
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Another question... [12 articles]
Dave - 19:17 01-04-08
The following link shows an LCD meter carried by my local parts depot. It
says "panel meter" and the sales associate tells me it is actually a voltage
meter that comes with so... Read More
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Controller help needed [4 articles]
Hlias - 12:58 01-04-08
Hello everyone.
I have an array of 20x20 electrodes (a pcb with a matrix of 20x20
terminals) and I would like to be able to control each one of them
separately through a compu... Read More
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Laser safety question [2 articles]
sert - 12:29 01-04-08
I just started working on laser systems. We have a problem on a
laser installation, it uses laser to transmit data across about
200 metres. We had to use a scope (which is moun... Read More
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CCT. Protection switch
Hammy - 09:39 01-04-08
I'm using a User activated mechanical DPDT to apply a 9VDC alkaline
battery to a L7805 regulator.This in turn applies 5V to a pulsed one
shot current source 50mA (20mA steady s... Read More
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"coupled" Inductors [4 articles]
Jon Slaughter - 01:47 01-04-08
What are the components that are coils of wire that are used like an
inductor but are wound on the same bobbin/core?
I took a part a dsl filter and I'm trying to determine wha... Read More
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Problem in autoscan FM radio [3 articles]
Allen Bong - 19:47 31-03-08
Dear group,
I have this one-chip china-made auto-scan FM radio which has a
problem. It has a "SCAN" and a "RESET" buttons on it. The scan
button is used to tune and lock to ... Read More
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Wave Trap [3 articles]
Dave.H - 00:23 31-03-08
I have an old tube regenerative radio, but where I live, there's a
powerful radio station that overpowers the other weaker stations, I
want to build I wave trap, already have a 2... Read More
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