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Everything posted by ante

  1. Bikerman, Yes, you are right :o. I found the original hand drawn schematic and this shows the correct connections to the opamp. Thank you very much for this info. Here is the hand drawn schematic: Ante ::)
  2. Bob, It looks like you have some major problems with your software. It has probably been too well cleaned out after the spy ware visit I am afraid. If your cleaning software creates a backup of the files then maybe you can reverse the process and start over. Good Luck Ante ::)
  3. Zeplin, Just any PIR? Well here is one for you to check out: http://www.elfa.se/pdf/75/07522402.pdf Ante ::)
  4. Darrin, You need to convert the output (10mV/degF) to pulses that can control the opto isolator triac. The lower the temperature the longer the pulses should be until it reaches the desired temperature. Ante ::)
  5. Audioguru, Congratulations, you found a key combination that worked! Well then there is no reason to upgrade yet! ;D Tube scope? I hade one of those 20 years ago and it was old then! It was a Trio Advance scope it weighed about 25 kilos or so. Ante ::)
  6. Stu, Is it something like this you are thinking of? http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=4313269647&category=20685 Ante ::)
  7. Stu, Yes there is an identical IC the LT1074 if you can get your hands on that one? Check this http://www.linear.com/prod/datasheet.html?datasheet=5 Ante ::)
  8. Darrin, The screw suggested by John can be highly accurate if you use a stepper motor to pull it. Then you can decide a number of steps for a dose and there will be no influences from the motors speed that can be the case with a timer. Just a thought! Ante ::)
  9. Darrin, The 4A triac will do the job mounted on a heatsink. It
  10. MP, I am not sure but in an old laptop I have with W98se it works. I don
  11. Darrin, For a start: Do you know the power consumption for the flexible heating element? A 4A triac on 230VAC (if this is your voltage) will limit the power to about 900W. For efficiency and ease of interfacing to temperature measuring circuit I suggest you look at the MOC3041 or MOC3061. The datasheet http://vitsch.net/datasheets/mov3041_optoisolator_triac_driver.pdf or http://www.fairchildsemi.com/ds/MO/MOC3163-M.pdf will give you info on snubbers for triac circuits. This Zero-Cross Phototriac Driver Optocoupler will galvanic separate the mains from the rest of your circuit and make it sim
  12. Bob, Welcome to this community. Here is an alternative for you to try. Ante ::) Curve-tracer.pdf
  13. Stu, If you want it small light this is the way to go: http://bc107.republika.pl/pdf/max724-6.pdf Here is the circuit: Ante ::)
  14. Audioguru, You can use the Prt Sc (print screen) to copy from any document and just paste it in paint, cut it to size and you are done! Try it! The circuits is almost the same, I like to have the protection diode in there also. The value of R1 is not very important but if you use higher value there is no need to cool the regulator. It will then go faster into thermal protection in case of a short circuit. I have encountered cases where regulators have been
  15. Audioguru, Sorry, I was starring at the wrong transistor on my drawing! I need some sleep obviosly! Ante ::)
  16. Audioguru, After checking my sketch again I discovered one mistake, I forgot to connect the collector with the VO of the regulator. Concerning the rest of the circuit I stand firmly! Posting the correct drawing here. I think a PNP transistor must have higher voltage on the emitter than on the base to be able to conduct. This is what I have learned as the forward biasing of the emitter base diode. But it was a long time since I was in school so things can be different now I am not sure. Ante ::)
  17. Audioguru, How can Q2 conduct when its base is 0.693Volts below the emitter? Please explain. Ante ::)
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