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  1. gorgon

    Admiralty chart with LED sequences

    Just some questions. Isn't the different lights sectorized, with different colours in each sector? Will you mask the different colours, and use white LEDs only? TOK ;)
  2. gorgon

    uln2003 data sheet question.

    In a new and better version. :eek: Beware of the lightning :D:D TOK ;)
  3. gorgon

    uln2003 data sheet question.

    Well, I took my alias from an old Norwegian children's TV show from the 60's. http://en.wikipedia.org/wiki/Pompel_og_Pilt Gorgon the janitor is one of the characters, and nothing to do with the Gorgon sisters from the Greek mythology. TOK ;)
  4. gorgon

    uln2003 data sheet question.

    Sometimes it is more like 90% thinking :rolleyes: And the rest is guesstimates :confused: Chris. I tried to make a humorous point, No offence intended. TOK ;)
  5. gorgon

    uln2003 data sheet question.

    Yes, I think we all want to be soothsayers, and make it a competition between us to be the best. :D TOK ;)
  6. gorgon

    serial loopback test won't work.

    Depending on the hardware/setup, you may need to loop pins 7and 8 too. This is RTS/CTS (request to send/ clear to send) Normally the UART need to see CTS before it transmit a character. If you want to communicate between 2 PCs, you need to use a 'null-modem' configuration. In it's simplest...
  7. gorgon

    Help with transistor switches please!

    Based on the very limited technical data on the coco box, I would have used an optocoupler to activate the remote input. Find the output voltage from the box, compute and use a resistor in series to activate the optocoupler LED with 5-10mA. Observe the polarity of the output. Then connect the...
  8. gorgon

    HELP WANTED

    I don't know what sort of budget you have in mind, but as mentioned a CE approval will probably be in the range £5000 - £15000, maybe more, depending on what you have to comply to. If you want to use and put together existing products, you may run into problems, if the manufacturer don't...
  9. gorgon

    74HCT193 - Is it Fried?

    I just had a second look at your schematics. Could it be that the speaker induces negative voltage spikes and pull the output below 0V when turned off? How about putting a diode over the speaker to remove this possibility? Is there a reason that you have put the speaker in the emitter-gnd and...
  10. gorgon

    74HCT193 - Is it Fried?

    Or it could be static electricity from the handling, or soldering iron? Is the soldering iron grounded in any way? TOK ;)
  11. gorgon

    UART, Tx, Rx

    Depending on the type of interface used. If you use a serial comm port with RS232, you use the UART in the PC. If you use USB to communicate, there is a different hardware interface and naming convention, but the basic function is the same. One difference is that USB use the same physical...
  12. gorgon

    Digital Pot setup

    The direct inrush current into the 4uF7 tantal capcitor will normally be the highest current at startup. As the capacitor is not a low ESR type and of low value, it should limit it's own current at startup. We're talking about some hundred us up to ms in duration. After that the current is...
  13. gorgon

    Digital Pot setup

    Hi Justin The zener in your case will drop the voltage supplied to the ts7815. As you state in your quote, the zener will start to conduct only when the zener voltage is reach. This means that the supply voltage on the anode side of the zener will be 5.6V less than on the cathode side of the...
  14. gorgon

    Digital Pot setup

    I was thinking about the power loss in the 7815, due to the current drawn in your circuit. From what you say, it should not be many mA. The 7815 tolerate around 2W with no extra cooling. That should be around 133 mA with a 30V supply. I'll think that spikes from the motor on the powerlines...
  15. gorgon

    Digital Pot setup

    what sort of supply currents are we talking about here? TOK ;)
  16. gorgon

    Problem about source

    1. Redesign your circuit, make it use much less current. 2. Get a new power source, a wallwart or a big battery, as said before. TOK ;)
  17. gorgon

    Problem about source

    Yes, but is it a 9V battery? If it is, it will be exhausted with 8V and no load, and not manage to keep the voltage up with a load applied. No mystery here. TOK ;)
  18. gorgon

    Problem about source

    What sort of battery is this, 9V? TOK ;)
  19. gorgon

    Earth or ground? What is the diagram here?

    As drawn, it indicates a single earth point to the chasis. TOK ;)
  20. gorgon

    i want to learn to code but.....

    Well, I've never seen Python or Perl for PIC compilers, but you never know. There is a world of hardware in difference between a DIY embedded program on a microcontroller, and some application programs on a PC. C would be my choice for microprocessor and -controller programming, lightly...
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