Electronics Forum / Equipment / January 2007

Whats the best way to arrange filtering between mosfets and motor ?
ie. is there anything to be gained here by using center aligned as opposed
to edge aligned PWM?
so can common mode chokes be used ?

I have a electronic load powersupply tester and was wondering how you
go about setting it up?  For a computer powersupply how would you set
it.   Do you set the resistance and for how much?  How do you figure
this out.  Just measure the inputs on the computer?   Does that give

I need some help in a patent issue. I'm in search of information
about inductive heating of a tool holder.
For detailed information :
www.inductionquest.net

Does anyone happen to know when the follow Tek scopes were released?
-- The Tek 519, which I believe was the first Tek scope with 1GHz bandwidth;
apparently released in the mid-60s.
-- The Tek 11801 along with the SD24 sampling head; apparently released in

I would appreciate a few recommendations for repair of Tektronix 465B
'scopes in Republic of Ireland or United Kingdom. I would consider a
Refurbished for old exchange deal if anyone is supplying that service.
TIA.

FOR SALE:
HP 8341A SYNTHESIZED SWEEP GENERATOR    $1,250
·    Frequency range: 10 MHz - 20.0 GHz
·    Frequency resolution: 1 to 4 Hz

I am looking for a US or Canadian source for a stripboard
track cutting tool.  These seem to be readily
available from a number of sellers in the UK, but
I have not found one in this side of the pond.

I have just bought a second hand  Thurlby LA4800 logic analyzer without any
documentation. Yesterday I was running some tests and all seem to work fine.
While in one off the menus, my screen started to flicker ,and all display
items

I need a digital power meter (preferably) with clamp jaw, measuring AC power of 2-15 kW / 220 V,
single phase, at a rate of no less than 10 times / sec (ideally - 20 times). It should connect to
PC.
All devices i've seen measure at most 2 times / sec. I even bought a protek 307 ...

I was recently asked whether using incandescent dimmers cuts electrical
costs.
When the lights are dimmed, is less electricity used or is it converted
to heat in the dimmer thereby still being consumed?

Anyone know the Email address of the makers of this programmer ?
I can't see it anywhere on their page (Chinese) -
http://www.ty51.com/index1.htm
Thanks...

Hi...
I saw a piece on CNN about how much power household electronics can consume
on "standby". In it, Alan Meier of the Lawrence Berkeley National Lab was
using a really neat little digital wattmeter that you could simply plug into

I have a Fluke 1900a which needs help, so i am trying to track down the
schematics. thanks.

Which one is better in the long run?
I'm a beginner in electronics. after reading few electronic books, now
I feel urge to start build small kits for learning purposes. I have a
$15.00 USD worth of multimeter. It's very basic and one funny things is

Hi,A VERY HAPPY  NEW YEAR  TO ONE AND ALL.I  have some dougts regarding
the transisters.
how a common emitter transister is working.
can any one explain me about transistor with circuit diagram.