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  1. J

    Test Equipment Importance

    You are really asking an open ended question. But is an oscilloscope and signal generator necessary? It is if you want to view wave forms and generate wave forms to test circuits. In fact it is almost essential. Really depends on your level of experience and your plans for the future. The most...
  2. J

    Theradyne treadmill PWM motor controller fail

    That control board you speak can probably be taken out of the equation with some tinkering, but then you will lose all ability to control the treadmill with the buttons and read any of the display information about the treadmill.
  3. J

    Exxis video monitor problems

    Right so a four camera security monitoring system is what you want? Sam's club sells them, or they did at one time. I see you are in the states.
  4. J

    where did it go?

    Didn't we at one time have a sticky thread about timers? Hence the note on the LED sticky, "another" work in progress? Or have I totally lost it?
  5. J

    RC TIMNG

    An hour? That seems way to long for a RC circuit, A few seconds is appropriate, but not an hour. Maybe you should be looking at a 4060 or something similar.
  6. J

    Op-amp behaviour confusing for an amatuer

    exactly what I was thinking. You want a comparator, don't forget the pull-up resistor. still want to use an op-amp? Maybe this will help. http://www.ecircuitcenter.com/circuits/op_comp/op_comp.htm
  7. J

    Can a step-down transformer be used as a step-up transformer?

    http://compare.ebay.com/like/390390771468?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar as duke says, they make a commercial product for testing insulation. I did a quick search and found quite a few megger's for sale at less then $100 bucks.
  8. J

    Heat Issues with LM732 Power Supply

    even linear regulators with pass transistors still dissipate power, the heat produced is just limited to something the linear regulator can handle. The rest of the current is routed through the 3055's and these will dissipated a little bit of power as well. You can still use the formula bob...
  9. J

    electronic push rod for hydrolic press

    Just a quick thought, but the lever just opens and closes valves correct? Then why wouldn't you want to replace the lever with electronic valves instead of trying to drive the lever mechanically? I am thinking something like the electronic valves you see in heating systems where they open when...
  10. J

    Can a step-down transformer be used as a step-up transformer?

    unless the insulation on the wire breaks down there shouldn't be a problem unless you exceed the current rating. That surely depends on the VA rating of the transformer and the load attached to it.
  11. J

    pc reset/led/hd cables..

    female headers is what I found them under on digikey. You will have to specify wire crimp style and the pitch. etc.
  12. J

    USB DSO Scope Probe ?

    if you want to just look at the waveform, you could probably just use a transformer to bring the voltage down to a safe level. I don't think it would effect the signal much.
  13. J

    i need help very badly

    imagine if you had come here and acted with a little more humility and said something to this effect. "I have this issue, i want to wire in an LED and need to know the value of the resistor. I can't do math very well because I have a disability and it won't matter to try and teach me. Can...
  14. J

    i need help very badly

    no one is insulting you(you are assuming way to much), but you are making it very hard for someone to try and help you because all you do is complain(not once have you really listened to anyone). I already gave you your answer. Go and fix the problem and let us know if it worked.
  15. J

    i need help very badly

    are you for real? Get out your calculator. We know that 1000 milliamps = 1 Amp. So therefor 20 milliamps is 2 hundreths of 1 amp. or 0.020A. Do you not remember decimal place values, tenths, hundredths, thousandths, ten thousandths etc.... let's try this another way, you have 2 pennies, what is...
  16. J

    i need help very badly

    it is not 20 amps. it is 20milliamps the difference is quite a lot. About 3 decimal places!!!!! 20milliamps = 0.020 amps Using ohms law, we can take the voltage drop across the resistor, which you said was 5V and divide that by the current we need through it which is 20mA. I did this for you...
  17. J

    CarPC wake on AC plug

    they limit the current. ;)
  18. J

    What is this part called?

    remove the power all together?
  19. J

    C programming code question!

    Very well kris, I see. Some times Logical OR & AND are || and && respectively. Guess it just depends on the uC? Anyway, I wondered what the 1<<? format was, now I know.
  20. J

    C programming code question!

    tim, I will admit I know nothing about the uC used in this application. But is the purpose of saving those settings then? I am still a little lost on what the write function actually does. But you are probably on the right track and the OP should take your advice. Kris, how does that work...
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