Electronics Forum

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I've been trying to understand the theory behind the design of the
Ultra-LD 200W Power Amp Mk2 in the Aug 2008 issue of Silicon Chip. The
amp uses On Semiconductor's NJL3281D/NJL1302D ThermalTrak power
transistors. These have integral diodes.

I thought this would be easy, but I'm struggling with the details.
I have some lights (12VDC 200W) I want to turn on when the water level
in a fountain reaches a certain point (i.e., the fountain is on).
If I use a level switch and trigger a relay, I have the problem of

oh yeah!
http://blog.makezine.com/archive/2008/08/bread_circuit_board_blink.html

A friend gave me a little yellow toroid (ferrite?) with a winding
around it, that he had butchered from some non-working computer part.
I unwound the (thick!) wire, re-wound it with 10 turns of primary, and
50 turns of secondary.

"When a true genius appears in the world, you may know him by this
sign, that the dunces are all in confederacy against him."
-- Jonathan Swift

I have a Weller WTCPT soldering station with the stock TC201T handle and
PTA7 700 degrees F. tip.  It's 15 years old and hasn't seen much action.  I
was using it a lot 3 years ago but for the past 2 years it's been sitting
cold in the garage.

Hi Everyone, first time post... Mr. Goldwasser suggested I run this
question by this group...
I work at a small college with a bottom electromagnet driven pendulum.
The electromagnet consists of a large coil (.75H) with an iron core

My co-worker has a Dell Laptop PP10S that works on batteries but not AC. He
measured the AC adapter to be the correct voltage.
Has anyone seen this problem before? Could it be a bad regulator?
Any assistance will be appreciated.

I just bought a flyback tester and have a drawer full of flybacks that
I want to test.  How do I know what pins to connect it to?  The
directions say to simple hook it up to the primary windings, but which
pins are these?

A chip too far? Where is your solution Mr Larkin?
http://money.cnn.com/2008/08/13/technology/microchips_copeland.fortune/index.htm
?postversion=2008081405
Blowing in the wind, all blowing in the wind.

I have designed a 1:1 transformer that will be used in a low voltage
DC:DC converter. I have tested the current at which the transformer
saturates by decreasing the frequency of the primary voltage while
keeping the secondary open loop.

Will pay reasonable shipping costs - but please ask only if you can
use a given item set.
1) 6 sets ferrite cores P14/8/I-3C81-A400 (ie: gapped) and retaining clips.
2) Rather old, untested, Analog Devices 310J amplifier module 3L x 1.5W

http://www.analog.com/static/imported-files/Data_Sheets/ADA4898-1.pdf
This is a potentially very nice part--0.9 nV, 2.4 pA, 1.5 pF Cin, 33
MHz, +- 15V.  The dynamic range is stunning, especially with that low
input capacitance--about a quarter of the LT1128's.  With quiet

What modifications are needed to convert C. Bassos TL431 Pspice model
to a TLVH431 model?
I tried the obvious switching the 2.495V to 1.24V but I get a
reference of 1.49V when I do this, it should be 1.24V.

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DC Circuits INDEX
http://electronicsvlsi.blogspot.com/2008/05/digital-concepts-in-electronics.html
Digital Index
http://electronicsvlsi.blogspot.com/2008/05/digital-concepts-in-electronics.html

Whats difference between Plecs and SimPowersystem?

Howdy all,
          I am trying to replace a TA8277P from Toshiba. Any help would
be greatly appreciated.
Thanks, Gary

Can someone point me to a source for some Cherry "G: series keyboard
keyswitches?  All I can find at Cherry's site are their current MX1
series.
These are the older and bigger style keyswitches that were used in

I have a wireless Apple Mighty Mouse that has died, and I believe it is
only the LED that has stopped working, but I don't know what specs to
look for in a replacement, and if anyone can tell me what they would be,
or where I can find the exact part, I would appreciate it.

hi , i have 19 rows of   four , 10mm white leds.  would it be better to
power them  straight from dc or a pwm supply ?
thanks
mark k

i have the following for sale ;
electronics now magazine
1997  aug  ,  oct
1998  jan  , may  ,  june  , july  ,  aug ,  dec

Tom Gugger
                                       Independent Recruiter
                                       tgugger@bex.net
                                       419-537-9447

Does someone knows where else can I buy this nice thing for my car? They
are not delivering to my country. :(
http://www.mixcafe.net/news/article/56

Gentlemen,
   We are looking for two IBM documents that are needed urgently for a
project. They are titled "4680 Store Systems Serial I/O Channel Attachment
Information" and "Serial I/O Product Attachment Information". $100 will be

Has anyone seen a ground fault circuit interrupter (GFCI) that would work
inline with a computer server plug?    These typically terminate with an IEC
C13 female plug end, so the GFCI adapter would need to be C14 to C13.
We are finding when we aggregate a large number of servers ...

A lot of  Solution  Manuals in Electronic (PDF)Format!
A lot of  Solutions Manuals in Electronic (PDF)Format! Just contact
with sendsolutions (at) hotmail.com (my email address),  these are
parts of our solutions, if the solution you want isn’t on the list,

Hello eveyone,
I was once told that a device rated for say 600vac would have an
equivalent
rating of twice the peak - peak for dc or in this example a 1697 V.

i need some lessons in power system protection and how to reed the
drawing of it.
with my regard