Dazza

Hi audioguru, have you thought of trying a hot metal spike to melt a hold through the CD, maybe a high-powered soldering iron with a large TIP . I have an idea that might be interesting to try. If you got a few pieces of Dow, and placed them flat in the shape of a cross, then place the CD on it and put it in the oven. It should distort evenly creating an interesting effect. You might want to drill the holes first though. Warning oven baked CD's are not edible ;D

I found a cross-reference page that was last updated back in 96, and listed these two as a cross-reference. (2N5457) (MPF102) both are available to me locally, well Dick Smith has a listing for them in their catalogue, which usually means there is a chance that they will have them. Does anyone have any idea, if either of these may work. Thank you :).

This is the whole project in PDF. 020161uk_3.pdf

I started this capacitance meter project sometime ago, and I gave up as I wasn't sure off a suitable replacement :(. (BF245A) Any help will be greatly appreciated.

They were flogging these off cheap at Dick Smith ;D. So if Dick Smith decided they were outdated, they must be ancient. As always, I search long and hard for this datasheet and no go. Philips (OM1681C) signal IC car alarm subsystem. Thank you :).

Nothing is simple is it ;D, I'll send Farnell an e-mail. Ante's comment that they would be popular for Christmas,I think is true :). That doesn't give me much time. I can see the scenario, I put a dozen out to test the market, and I find everyone wants one, and then I can see myself going mad trying to keep up, with no experience soldering in surface mount chips ;D ;D,

Audioguru, surprise surprise, Farnell doesn't have a listing for the(CD74HC4017N) please tell me there is an alternative ???. Also Farnell does have a listing for the(CD74HC14N) although it is not a (N) it's a (M) will this do the job :-\. Thank you

Yes that's right, that way you won't give it a chance to get hot as well ;D. [move] I'm ready for the next one mate :P,[/move]

Audioguru, it's a deal :D. I'll first have to teach you, how to drink a Guinness upside-down ;). As for your question, a dozen Guinness should do the job nicely :P.

Hi audioguru, very nice, top job :D. can I make these and sell them locally ???

Hi soundboy, I know very little, but maybe you can use a hall effect sensor for measuring the current, then feed the signal from that to a frequency to voltage converter.

lol ;D

Thanks Steven, it doesn't mention the gauge wire to use, or the size of the ferrite bead ???. maybe it's not that important. I put together the transistor tester circuit, it works very well :D. One down 4 to go ;D.

Yes, most important ante, I have to get your stamp of approval on it ;D;D. [move]ante of Sweden says it's ok 8)[/move]

This is what I have so far, I haven't checked it four mistakes, I'm not finished with it yet ;). I think it will be best to make them individually and as small as I can, so I can fit them into one small unit. Ante, I did consider that circuit that you posted, but I decided that the one steven posted, would suit my needs for now. I'm only considering my needs for the task ahead for now ;D. steven, I would like to have a look at that crystal tester circuit that you have :D. I may be able to fit it in their somewhere ;D. I see you are getting serious with your hydrogen experiments, it is looking good Steven 8). Be careful with using PVC, if you get over pressure or an explosion. The PVC will shatter into pieces, it will be like 100 knives flying at you :o, I hope you can run fast ;D. Maybe putting the unit into a Haitian bag. Any suggestions or improvement ideas, is very welcome :) :). Thank you.

Hi audioguru, I am being ambitious ;D, I'm trying to put four different types of test equipment into one unit, zener diode tester, mosfets tester, transistor tester and 555 timre tester. Not much room for a LCD ;D. If I have to I well use a DMM :(, although it would have been nice to not have to.

Ante, aiming for good quality, workmanship and accuracy is important, even if it is a DIY job, I like to take my time and do as good a job as I can, quality not quantity ;). I am hoping for reliability more than accuracy for the pressure transmitter, 10% accuracy would be reasonable to hope for I think. I have a couple of washing machine pressure switches, for backup in case of over pressure or under pressure. Once I get to the stage of applying this system to a test vehicle, the pressure senses will have to be replaced, with ones that are designed to do the job reliably and accurately. At the moment I'm working on putting together as much test equipment as I can, I'm building up the armoury ;D.

I would like to try to avoid using a DMM with this Zener diode tester. May be a row of LEDs? Help on how I can do this please :-\. Any help will be appreciated.

Ante, you mentioned in a previous post, that you didn't know what the output from U1 was, that's what those voltage measurements were from, the Hall sensor. Ok good, we know this circuit will serve its purpose with a little tweaking, once we know how it needs to interact with the other circuits. Thanks ante. Slowly but surely we are moving forward ;).

Audioguru, couldn't stuee use a voltage regulator (LM350K) it can handle 3A, for the 10V required for the 6-Volt gel cell charger. You have me curious of what your new finished project is, Do you want us to guess what it might be. may be a skunk detector? ;D.

Ante, can you give me any suggestions, on how I can reduce the output to 0v, so than the sensor will start responding from 0v to the maximum that I want. Yes wielding that soldering iron, after a couple of beers probably isn't a good idea ;D.

yes Ante, something did go wrong it was U2, I replaced it with another and it worked, and I tried removing the diode again and it worked find like you said it would ;D. Removing the diode didn't make any difference, except for having one less component which is good. The output from U1 is 2.43v to 3.62v. I tried using an electromagnet from a relay, and its influence on the Hall affects sensor was a little better than half that of the influence of the magnet. That's not all that good, the electromagnet that I used is about twice the size of what I wanted to use. So I may have to try to use a standard magnet. I wanted to use an electromagnet so I could very it's, strength giving me more opportunity for collaboration :). ante, just to be sure, yes I was pulling your leg, in regards to it being your fault something went wrong ;D. When you suggested to remove the diode, and I found problems after I done this, I hope you don't think I was pointing the finger at you because something went wrong ???, I would never do that :o, even if you did make a mistake on a suggestion and everything went up in smoke. I was just trying to use some good old Aussie humour, I hope you took it the right way, mate ;D ;D.

This one might be better ;D. http://www.uoguelph.ca/~antoon/circ/bcgla2.htm

Have a look at this one :). http://www.uoguelph.ca/~antoon/gadgets/carnc12.htm

Sorry stuee, I haven't been much help ;D, I'll have a search and see if I can come up with something.