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  1. Old Steve

    Simple power supply?

    Mike, just for future information, you don't need to connect any transformer wires together to make a full-wave rectifier with a centre-tapped transformer. Here's an example:- Edit: You need to make some circuit changes to do that. This isn't a constant-current circuit, only constant voltage.
  2. Old Steve

    Wow...he calls it the Scariac!!

    Not a very bright thing to do. :rolleyes:
  3. Old Steve

    Help making a CRT oscilloscope

    Yeah, you're probably right. K.IS.S, as they say. :)
  4. Old Steve

    Help making a CRT oscilloscope

    Have you considered someting like adding a couple of small RC model servos to move the rare-earth magnets around, pulling the beams in different directions? It could probably produce some pretty interesting effects.
  5. Old Steve

    How to time a watch winder

    The 4013 with no load connected will go right to both power supply rails, so yes, +12V for 26 minutes, 0V for 26 minutes, +12V for 26minutes etc etc. (It will stay high or low for the total of the 555's high + low periods.) NZ postage is fairly cheap. So as I said, one way or another we'll get...
  6. Old Steve

    Pic and JTAG Programmer

    Good. And I use the K150 you referred to. Works great for me.
  7. Old Steve

    What component to use to keep multiple pins high

    That's what PICs are for. ;)
  8. Old Steve

    control system counter up to 9

    Depending on your compiler, if the TRISC line I wrote above doesn't work, although it should, try this:- set_tris_c(0b00000000); TRISC=0b00000000; works in my C compiler. output_C(value); doesn't work in my C compiler, so I can't help much. In my compiler, this works:- "PORTC=0b11110000;"...
  9. Old Steve

    control system counter up to 9

    You don't appear to have set the TRISx registers for the ports that you're using. I didn't actually realise there was a PORTE on the F877, but just checked the datasheet and there is, multiplexed with AN5, AN6 and AN7. Can I assume that this "output_C(LED[count]);" addresses PORTC? You'd need...
  10. Old Steve

    control system counter up to 9

    Kath, when you post code, it's best to use code tags. At the top of the edit window, the fourht item from the right will highlight "Insert..." when you hover the mouse over it. Click on that button and select "Code", then paste your (formatted) code into that window. It makes it much easier to...
  11. Old Steve

    Help making a CRT oscilloscope

    That looks pretty cool. You've done a good job. Nice neat appearance, too. Well done. The theremin idea is interesting as well.
  12. Old Steve

    control system counter up to 9

    I don't think anyone is going to write your program for you, Kath. You really need to make a start, get as far as you can, then ask for assistance if you have problems. Do you have any C programming experience?
  13. Old Steve

    Pic and JTAG Programmer

    I think you're just a tiny bit too late, @Eletric Crazy . Check the date of the post you replied to - even the last reply before your's was 18 months ago. Let's hope "themasterm" has already fixed his problem by now. ;)
  14. Old Steve

    Help making a CRT oscilloscope

    Excellent, Gus. I'm glad you found another one. Much easier than winding your own coil. I'll be interested to hear how your project progresses.
  15. Old Steve

    How to time a watch winder

    Oh, I meant to ask, too. Are you in Australia? I ask because if all else fails and the circuit doesn't work, I have a backup plan. I could program up a microcontroller to do all of the timing accurately and replace both the 555 and 4013, and post it to you. The drawback would be that a small 5V...
  16. Old Steve

    How to time a watch winder

    You can't test it like that, I'm afraid. I'll explain in a moment, but first, a clarification. You say "connecting pin 3 and 14 to the power directly". I hope you mean that you connect pin14 to the power and leave it connected, then touch pin 3 to the +V to trigger? You need to leave the power...
  17. Old Steve

    Which transistors do I use?

    BluTak's a great invention. I use it for a lot of things, like what I'm doing right now:- That's a Mattel Mindflex headset, with components too small to see. (For me, at least.)
  18. Old Steve

    Which transistors do I use?

    I just use a blob of Blu-Tak to hold boards still while I attack them.
  19. Old Steve

    Simple power supply?

    Even I can answer that - you're right, Cadj = C2 in the diagram in post #3, (from the adjust pin to ground). And for two series LM350s, the 0.1uF dorke mentioned would go from the output of the first reg, (which is also the input of the second reg), to ground. And the same diodes as in the...
  20. Old Steve

    Diode - Temperature

    I'd prefer to just use an LM335Z.
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