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  1. Dazza

    Making an electric furnace.

    Hi Ante, Alun :), The op amps that you suggested Ante, are not easy for me to get, that is not available from Jaycar or Dick Smith >:( but luck is on my side this time, I have two recycled (TL061) that should be ok :D. Yes the calculating thing, haven't got the hang of that yet :o, and...
  2. Dazza

    Making an electric furnace.

    Alum, thank you so much for your help and advice :), what you are suggesting, would basically mean a complete do over , I think that the big problem that I will find with the switching on and off, is that it may be very stressful on the type of elements I am using Nichrome 80 wire. This is one...
  3. Dazza

    Variable digital resistor???????

    ArcAngel2479, check this out(http://www.autospeed.com/cgi-bin/browse.cgi?category=4334&sc_add=100770004&) the programmable ignition timing module, may make the purchase worthwhile :).
  4. Dazza

    Making an electric furnace.

    This is all I have been able to find so far :-\.
  5. Dazza

    Making an electric furnace.

    Ante, I'm going with the LDR and LED ;), I just need to find a thermocouple Preamp circuit, that uses commonly available components to work from, I'm just not to good at starting from scratch :-\.
  6. Dazza

    Making an electric furnace.

    Hi Alun, I don't know much but Yes I did know they were the wrong symbols ;), ExpressSCH unfortunately didn't have them available, so I went with near enough, I could have made a custom component but I guess I was being lazy ;D. It is very likely I will make mistakes along these lines in the...
  7. Dazza

    Making an electric furnace.

    Hi Ante, Yes Ante I do get the idea, and it is a good one, and I think it will work. Your idea means that I won't have to worry about mains power, while trying to get it to work. I have no idea what range is used on the DMM, the thermocouple that I'll be using, is meant to be used with a DMM...
  8. Dazza

    Making an electric furnace.

    Hi Ante, Alun Melting point for aluminium is around 660C. I don't know what the temperature should be for pouring into the mould ???, when I was working in the foundry we knew it was at the right temperature, by its texture and colour and it was very rare that we ever got it wrong, hopefully I...
  9. Dazza

    Making an electric furnace.

    Hi Ante, Nothing went wrong, it was just that I had to go out and I didn't want to leave the furnace running unattended, always safety first ;). I have fired her up again this morning, the furnace temperature control works great, with a large heat sink it doesn't get hot enough to need to use...
  10. Dazza

    Making an electric furnace.

    Well it looks like it works 8), and I am ahead of schedule :). In the first pic you can see my you beaut trolley ;D ;D, with the furnace mounted on it, I was planning on salvaging the wheels from this old lawnmower to use for making a trolley, then I thought why do that when all I have to do is...
  11. Dazza

    I am not receiving topic notification.

    Hi audioguru :), Yes, that's probably what the problem is, my ISP.
  12. Dazza

    Pages take forever to load?

    All is well mixos, and has been for quite some time now 8). Your efforts are very much appreciated, Thanks mixos ;).
  13. Dazza

    I am not receiving topic notification.

    I have been receiving topic notifications now, I got 17 come through at once. I don't know why I wasn't receiving than, or why I started to receive them again. I guess these things just happen. ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D
  14. Dazza

    Making an electric furnace.

    Hi Ante, It's just about finished 8), if all goes well I'll post a pic of the first melt, which should be Saturday :D.
  15. Dazza

    Making an electric furnace.

    Ok, so far so good, every think is coming along nicely better than I expected :), I have applied heat to the furnace for several hours to drive out moisture, a few more hours and she should be right to crank up the heat, once I make the new heat controller unit, and install the second element...
  16. Dazza

    Making an electric furnace.

    Hi Ante, It's pretty much as you described ;), the picture below shows three of the four ingredients for the refractory, top left is the perlite, below that is the silica sand and the third is Portland cement, the fourth ingredient to be added after these three are mixed and moistened, is...
  17. Dazza

    Making an electric furnace.

    Hi MP, Ante, There was a new story on TV tonight about the cost of running an air-conditioner, they said that it cost about 80 cents to run an average air-conditioner for an average size bedroom for 10 hours, that is for an air-conditioner around 950W. So it looks like I won't have to climb...
  18. Dazza

    MOVED: stun glove

    The project involved, potentially lethal high voltage. http://www.electronics-lab.com/forum/index.php?board=24;action=display;threadid=2544
  19. Dazza

    in search of a FM STEREO transmitter

    Good find rasOfir :D, I'll have to take on that project as well, when I get the chants :). There's a lot of FM transmitter projects out there, yes that can be difficult choosing the right one ???. Have a look in the projects, you might find something to your liking(...
  20. Dazza

    Making an electric furnace.

    You are probably right MP :), although I don't think there would be a significant difference in cost to using gas, it would really depend on where you are from, cost of gas/LPG and electricity in your country. Once I get every think up and running, I'll workout the cost of electricity to...
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