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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Voltage ripple [2 articles]
Hammy - 19:41 30-03-08
I'm measuring the output ripple on my flyback (60 kHz @10W). I'm using
2 polymer aluminum caps 16V 470uf 9mohm 100 kHz ESR. The peak
secondary current is 5 Amps full load this ... Read More
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Regen Radio Ideas Needed [25 articles]
Dave.H - 00:58 30-03-08
I've been looking on the internet for regenerative radio plans, but
haven't found any I like. I was hoping someone here could help. I
want to build from scratch, no kits. I wou... Read More
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MOV Standoff voltage
Hammy - 11:39 29-03-08
What would be the better MOV for L-N for a 90-140VAC input smps.The
supply includes a 25mH CM choke and 0.1uf X2 cap,600v bridge and 250V
bulk cap.
I was thinking these 15... Read More
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One for FPGA newbies, video answer
Tony Burch - 01:50 29-03-08
Hi all,
Video #2 here answers the question "What is an FPGA?"
http://www.burched.com/freevideos.ag.php
That video also answers these other newbie questions:
And how is t... Read More
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harmonics in power [8 articles]
21:56 28-03-08
i was unable to understand what these harmonics are?
plz help me regarding this
... Read More
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Flyback load transient test [4 articles]
Hammy - 20:37 28-03-08
What is a typical period and pulse width of a load transient test on
60kHz flyback converter. I've been reading datasheets and there
doesn't seem to be any consistency. They rang... Read More
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