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  1. hexreader

    Old RS-232 compatibility with new computers?

    I do not think that voltage levels will be the problem. That looks like a proper RS232 device that would be compatible with a modern PC serial port. Cheap USB to RS232 converter could possibly cause a problem, so use a real serial port if you have a choice. The converter in your link looks like...
  2. hexreader

    Old RS-232 compatibility with new computers?

    quote: "- Is it possible that an old RS232 work on different voltage level than what today's computers can manage?" VERY possible ! Older computers would supply a solid plus and minus 12 Volts at a good 20 milliAmps or more on all outputs. Modern computers might give +9 Volts and -5 Volts...
  3. hexreader

    Should wire be Twisted before Crimping?

    Thanks Guys, I feel a whole lot happier now :)
  4. hexreader

    Should wire be Twisted before Crimping?

    No, but I always assumed that twisting allows the possibility of the finished item becoming partially or fully untwisted, which would reduce the wire diameter and weaken the crimp. Untwisting would also lengthen the bare portion of wire, possibly leaving exposed wire in some circumstances? But...
  5. hexreader

    Should wire be Twisted before Crimping?

    With reference to this post: Here I was taught that wire should not be twisted before crimping. Was I taught wrongly? Also a ferrule seems like the wrong thing to use on a screw terminal to me. (and the OP lives in US, but seems to have been given UK advice) Sorry if this sounds like...
  6. hexreader

    A control panel for a two year old Christmas Present

    What country do you live in? (to have an idea of what is easily available....) How much are you willing to spend? You could make a finished panel quickly and cheaply yourself, but this would have limited educational value for your son. Much more educational would be if you provide sockets and...
  7. hexreader

    Wind farm – payback methods

    Wow - you really are naive. The world is full of people who will happily take all they can get and give nothing back. In fact they will probably keep asking for more. Sorry....
  8. hexreader

    Wind farm – payback methods

    Wind farms are profitable because governments plough huge subsidies into the technology and implementation - at tax-payers' expense. No return on investment required. If Wind farms had to compete on the same terms as established technologies, there would be far less of them, and those that...
  9. hexreader

    Maximum voltage generated by a function generator

    From the manual: Amplitude Range 10 mVpp to 10 Vpp into 50 Ω 20 mVpp to 20 Vpp into open circuit Imagine the generator as providing +/- 10 Volts at maximum output, then imagine that there is an internal 50 Ohm resistor in series with the output connector. The ideal load would have 50 Ohms...
  10. hexreader

    How to choose the transformer rating for linear power supply voltage regulator

    Sorry to break the flow of the thread again - just wanted to say thanks - I understand a little better now :)
  11. hexreader

    How to choose the transformer rating for linear power supply voltage regulator

    I am a little confused.... ... but I guess my understanding is poor. If the 24-0-24 transformer is being half-wave rectified using two diodes (don't know if that is the case here), then won't the average current in each winding be half of the AC output value? ... or to put it another way...
  12. hexreader

    pic16f877a not responding

    In that case a bracket will need to removed further on. The code posted will not compile due to more closing brackets than opening brackets.
  13. hexreader

    pic16f877a not responding

    Shouldn't there be an opening curly bracket after "while(1)" ? You seem to be using PORTC as output, but I do not see anywhere that you have cleared TRISC register. Your code is hard to understand because the commenting is so poor. We have little idea what is connected to each input and...
  14. hexreader

    Are PICs still being used

    IMHO.... If you used to like PICs 8 years ago, then you will like them even more now. Newer PICs are more impressive and as popular as ever. Atmel processors do much the same thing as PIC, but no huge difference, and I see nothing to make changing worth the bother. (I play with both) Arduino...
  15. hexreader

    Not Understanding this AC Circuit!!

    The resistance of a light bulb is very different when cold, compared to when hot (assuming old-fashioned coiled-coil light bulb). Your calculation of resistance-when-hot = 271 Ohms is probably correct. As far as I know, inductance is negligible, and at 60 Hz would have little measurable...
  16. hexreader

    pic 12f675 programming

    PIC12F675 cannot be programmed using USB or serial. You will need PICkit3, PICkit2 or similar hardware programmer. To reduce the chances of problems, I would recommend buying a genuine Microchip (or mikroElektronika) programmer, not a clone.
  17. hexreader

    About STM32

    I use STM32 occasionally - with mikroElectronica C compiler. Which tool-set do you use?
  18. hexreader

    Remote Control from scratch

    No, the resistor value is not the mistake. Look carefully at the datasheet for the main IC for both the transmitter and for the receiver. You will see that the pin marked OSCC connects to a capacitor and a resistor on the datasheet. On your circuits, OSCC only connects to a resistor. The pin...
  19. hexreader

    Remote Control from scratch

    Never used these chips myself, but looking at the datasheet, it looks to me as though you have OSCC and OSCR reversed.
  20. hexreader

    Woo-woo projects.

    You hired the wrong person.... get your money back! It is vital that you use the words VERY URGENT!!!!! and Plzzzzz (or pleeeeeazeeee) in every post to be certain of being instantly ignored :) Best to post in at least three sub-forums of at least five forums to cause maximum irritation...
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