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  1. Old Steve

    Wow...he calls it the Scariac!!

    They're usually an auto-transformer, too, and don't have full isolation. I used to have to use mine with a separate isolation transformer. (I used it for CRT TV repairs.) Never seen one that has a stepper motor.
  2. Old Steve

    Use for an Xbox joystick unit

    Build a robot car to go with it. A great project, I reckon. :)
  3. Old Steve

    Diode - Temperature

    @M.Sridhar , did you try Googling this? There is already heaps of info on this subject online. It took me 10 seconds. And double-posting the same question 25 minutes apart won't get it answered any faster:- https://www.google.com/search?q=using+diode+to+measure+temperature&ie=utf-8&oe=utf-8...
  4. Old Steve

    Help with open collector output

    That's understandable. Is it possible to run the 12V wires back from the battery with the motor / relay wires? Just a thought.
  5. Old Steve

    How to time a watch winder

    I mentioned in post #3 that all unused inputs on the 4013 need to be tied to ground. Just thought I'd remind you. Also, the 10K resistors that I drew connecting Reset and Set to ground are not necessary. You can connect those pins directly to ground. (Not sure why I drew the resistors - they...
  6. Old Steve

    How to time a watch winder

    Excellent, I'm glad to hear that. Yesterday's results had me a bit puzzled. These values sound much better. I would have replied earlier, but sat down on the couch for a minute this afternoon and slept for 7 hours. :eek::rolleyes: Let me know how you go with the next stage. It's the easiest...
  7. Old Steve

    Simple power supply?

    In My Opinion
  8. Old Steve

    Simple power supply?

    He's actually below the Vin-Vout = 10V, at which a potential 3A out is possible. His is 9.9V. It may not be the most efficient way to do this, but should work at the test current of 0.5A if the heatsink is big enough to effectively dissipate 5W. (He says the heatsink stays cool, so the internal...
  9. Old Steve

    What component to use to keep multiple pins high

    I'd never heard of a TPIC6B595. It looks good for your purpose, and better than the 74HC595/ULN2803 combination. Reasonably easy to get, too, it appears.
  10. Old Steve

    Help with open collector output

    Glad to hear that it's working well. And that explains the puzzling voltage from the open-drain output. Have you considered powering the receiver from the (larger, I assume) 12V battery, or is the motor and 12V battery a distance away? Then you wouldn't need to worry about regularly replacing 9V...
  11. Old Steve

    What component to use to keep multiple pins high

    Here's an example circuit from one of my old projects for using the 74HC595s and ULN2803s with a PIC. I used it as a standalone 16-channel Solenoid Driver Board that I could address with one pin of another PIC. Notice how well the pins line up between the 74HC595 and the ULN2803. Almost perfect.:-
  12. Old Steve

    What component to use to keep multiple pins high

    That's what I usually use the 74HC595 for. Adding outputs, that is. You can series them up for more than 8 extra outputs, too, by taking the 'serial out' pin from the first and connecting it to the 'serial in' pin of the second, then clocking them both together. Keep in mind, though, that this...
  13. Old Steve

    DALI lighting interface

    Hmmm. They didn't put matching labels on things. ie There's no other reference to OUT DALI+ (D) anywhere. So, I can only guess. To be frank, there isn't enough information. I'm right in the midst of writing a program and can't spend any more time tonight. I've still got hours of work in front of...
  14. Old Steve

    DALI lighting interface

    Where exactly is "OUT DALI+ (D)" referred to? (Page number, figure number) It's OK - found it. I'll just have a good look.
  15. Old Steve

    How to time a watch winder

    Now I'm with you. I thought you originally did it on a breadboard, and that now you were soldering up a permanent circuit. Didn't realise it was only a simulation last time. That photo will help. And I'll try to find a 4700uF cap.
  16. Old Steve

    DALI lighting interface

    I don't have much time tonight. I have a lot of work to do, at least another 5 hours, but I'll try to quickly answer your questions:- I apologise. I only looked quickly, and misread how the circuit operates. I was looking at it sideways, too, as well as being in the middle of something else...
  17. Old Steve

    How to time a watch winder

    I just remembered, you already built it on a breadboard. A lot has happened here in between. If the breadboard circuit is still together, compare your new circuit's connections against it, to see what's wrong.
  18. Old Steve

    How to time a watch winder

    In the meantime, here are the pinouts:-
  19. Old Steve

    How to time a watch winder

    Ah right. Those voltages are odd. There should only be two levels - ~12V and just above 0V, not 0V, 1-7V and 12V. And those timings aren't right either. The high and low periods should alternate and not vary from cycle to cycle. Something is wrong. I would have expected values in the...
  20. Old Steve

    Linker files

    I use a K150 USB PIC Programmer. Only cost $10 on eBay, and works very well. The programming software is free on the web. This programmer:- http://www.ebay.com.au/itm/PIC-USB-Automatic-Programming-Develop-Microcontroller-Programmer-K150-ICSP-OK-/261733000793?hash=item3cf080a659 This listing is...
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