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That is an inteeresting idea. I never messed with any of those chips, though I did have one I picked up at Radio Shack some years ago, I think it was called a "9400C" or something pretty close to

--- "Stefan Trethan" <stefan_trethan@...> wrote: *snip* *snip* Once again, I think Stefan hit the spot. Chris indicates that he wants storage / retrieval. As for the software, the advertiement

Hello, can someone please help me to identify a part I have. It looks like a small MOSFET, but it has 4 legs. The wrighting on it says "CDT 33?? -04 0544. It is used on a "inline" LED Flasher circuit.

It's a fairly simple circuit. If you do a google search you should be able to find a few schematics for curve tracers that utilize an oscilloscopes X-Y function. At it's most basic you just need a 10v

Hi William In a previous post you discussed about a sound card based curve tracer. I would request you to share information about the same. I am looking for the following information 1) Is it a

Great find! Should be just what I need for my soundcard curve tracer.

I'm using my Ghodlike listowner powers to repost the entire message, because Stefan hit it on the head. We keep rehashing this over and over again. Steve Greenfield <stefan_trethan@...> wrote: posing.

<lcdpublishing@...> wrote: Chris, If you decide to jumper the input capacitors on your sound card, you put your computer at significant risk. In fact, I think I, personally, would pass on the sound

The one I am working with the most right now is the free one from Virtins. http://www.virtins.com/page3.html Scroll all the way down to the bottom where they list the "OLD VERSIONS". I am using V2.0.

Hmmm, that sounds neat. I will have to look through my box of computer "Guts" and see if I have an old card. Chances are good though they would be surface mount though wouldn't they? Chris

--- John Popelish <jpopelish@...> wrote: Yep, still using a current source. I wanted to remove the effect of the secondary, thus I can only watch the voltage across the inductor to see what

Shawn Upton wrote: Powdered metal cores are almost all good insulators, because the bonding material between the grains is good insulation. Only a few very high permeability, low frequency materials

Guys isnt this conversation getting out of hands. I am sure all the methods to reply are ok, after all the group has survived communication in past and we have been able to help each other. Just a

Shawn Upton wrote: (snip) (my opinion, not a rule) Include just enough to remind the reader what post and what part of that post you are replying to. If they haven't been reading the recent history,

Which soundcard scope are you toying with? I've been looking for a free soudcard based scope program to try and make a little PC bsed curve tracer for trouble shooting.

What about an LM231? Voltage to frequency converter. You could then measure DC levels on the computer Hmm, that'd be a bit strange: trying to measure a changing voltage by correlating the frequency...

There's a way to get around that, particularly if you have a spare sound card to mess with. You remove the coupling capacitors that are blocking the DC from the input connector, and jumper the pads...

This kind of neat. I can shut down the scope, re-start it and the traces are showing the same as before. I don't have to push every button on the computer like I had to do with my "real" scope ;-) It

Ah, took me a moment--for powdered iron cores, the higher the permability, the more conductive the core is. The core I'm playing with is ferrite though, and I don't think they are conductive as a

You really can't go too wrong with a used Tektronix scope. The two biggest problems I see when they come in for repair are: 1) dirty cam switches (these were used mainly in 5000 and 7000 series), and