Jump to content
Electronics-Lab.com Community


  • Posts

  • Joined

  • Last visited


Everything posted by ante

  1. 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 ::)
  2. 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 ::)
  3. Stu, Is it something like this you are thinking of? http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=4313269647&category=20685 Ante ::)
  4. 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 ::)
  5. 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 ::)
  6. Darrin, The 4A triac will do the job mounted on a heatsink. It
  7. MP, I am not sure but in an old laptop I have with W98se it works. I don
  8. 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 simple to connect the rest of the circuit. Ante ::)
  9. Bob, Welcome to this community. Here is an alternative for you to try. Ante ::) Curve-tracer.pdf
  10. 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 ::)
  11. 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
  12. Audioguru, Sorry, I was starring at the wrong transistor on my drawing! I need some sleep obviosly! Ante ::)
  13. 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 ::)
  14. Audioguru, How can Q2 conduct when its base is 0.693Volts below the emitter? Please explain. Ante ::)
  15. Mash, A 15-0-15V transformer can be used the same way as a 30V transformer just don
  16. Hi All, Here is some software for electronics: http://freshmeat.net/browse/246/ Ante ::)
  17. Rhonn, There are non that I am aware of! If someone knows of any It would be nice :). I don
  18. Rhonn, I have heard from people how have had success with these things, but they are in the frequencies that you can hear yourself (2200 to 3500Hz). So it is a question of who can stand it the longest you or the mosquito
  19. Jeff, Welcome to this community. Something similar happened to me with a projector, not the same brand but anyway. I found out that the problem was the cable from my laptop to the projector that was faulty. I hope this helps. Ante ::)
  • Create New...