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  1. Martaine2005

    Simple LED timer circuit

    Yes, you are right. They are rather power hungry! The CMOS ones are a lot better but there output is tiny in comparison. I wasn't saying to use one! Just that they don't have to "flash" constantly. Martin
  2. Martaine2005

    replacement 4 lead fan.

    Yes, exactly that. The forth blue feedback wire is fed to the base of an NPN transistor. If you can locate that and the pad it switches 'high', you may be able to solder a link between them.. But your best bet is to just bite the bullet and buy a 4 wire fan. Martin
  3. Martaine2005

    Simple LED timer circuit

    Just a side note... The 555 doesn't have to oscillate. It can be used as monostable.. But see what Dorke has up his sleeve! Martin
  4. Martaine2005

    minimum power

    Hello, I think your project is extremely complex. Stable flight comes from fuselage, wing and control surfaces. Electronics can help after the initial plane is constructed. Your question is so far out that their isn't a simple answer. What have you done so far? Is the plane finished ready for...
  5. Martaine2005

    Hi, I'm Cris

    Hi Cris, I guess you mean electronic test and repair equipment? For any questions, you can ask in the General Electronics Chat section.. Good to see another chippie here. Martin
  6. Martaine2005

    What is this called?

    Hi Bob, They are just claw test probes or grips. Different companies have different names. Test clip probes. Martin
  7. Martaine2005

    new to circuitry

    Harold is saying to put the led across the switch. You will need to connect battery to resistor and then the switch 1 . Now put led across 1 and 3. Then 3 back to battery negative. The led will be on constant. When you press the switch, it will short the led and it will go off. Let me edit the...
  8. Martaine2005

    new to circuitry

    Oops, Harold has replied. Here is a simple push to make that has the switch led on constant but switches your white led.
  9. Martaine2005

    new to circuitry

    Yes but, you need one for the switch led too. Give me ten minutes and I'll give you some ideas to have the switch led constant and to turn on / off with the switch.
  10. Martaine2005

    new to circuitry

    Ok, first of all, you have a white 3v led in your diagram too. You will need a resistor of about 240 to 300 ohms for it too.
  11. Martaine2005

    new to circuitry

    It looks like that switch is only "push to make" contact. You want a "push to break" switch. But for this switch. Put your circuit to 1 and 3 Or 2 and 4. Martin
  12. Martaine2005

    How to stop a motor from running when it is physically stopped

    Hello, yes, stalling a motor would draw large amount of current. Not really recommended. But it would all depend on the motor and size. You may want to look at motors with an electronic brake. Martin
  13. Martaine2005

    new to circuitry

    Sorry, I just read your post again. 6 pin switch? What switch is it? Can you give us a link or the numbers by the pins? Martin
  14. Martaine2005

    new to circuitry

    Something like this? But with your push to break switch..
  15. Martaine2005

    replacement 4 lead fan.

    Is this the back of your psu? There might just be a trick.. Martin
  16. Martaine2005

    LTspice, Warning node is floating

    You did nothing wrong, they are the text net labels. I tried it out and it does indeed work correctly. I am only just getting into LTspice, I normally get the 'error' by forgetting to label it! So I just connect them all. Martin
  17. Martaine2005

    Crotech 3133 manual needed please

    Hi Neil, The manual for the 3131 dual trace cannot be uploaded here. Says "ERROR File Too Large". You can view it and d/l it from here. Just click on the first (top) link and then at the bottom says "download file". Hope it helps. Martin
  18. Martaine2005

    replacement 4 lead fan.

    Sory Dave, I am confused more than ever. You said to get a 4 wire fan working. Now you have a 3 wire fan wanting connection to a four wire molex connector? What bit don't I understand? Martin
  19. Martaine2005

    replacement 4 lead fan.

    OK Dave, I found this for you. Pay attention and you will be sorted. BTW, I am UK too... Martin
  20. Martaine2005

    replacement 4 lead fan.

    Ah, I thought you were looking for a replacement 4 wire fan as John gave a link.. I would think you CAN trick it in to believing a voltage is there! You have the 'good' second unit with four wires. Work out which are the fan and then the other two wires by checking voltage and when that voltage...
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