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  1. gorgon

    Keeping a high output LED safe from a peaky PS

    I would think the constant current generator will try to compensate for the missing load with a increased voltage. You will then get a peak voltage when switching between LEDs. What you could try was to add a basic load with som zener diodes, that is permanent connected to load the circuit...
  2. gorgon

    USB to serial question

    2mm is a standard pitch, so a 3pin 2mm female connector could well be the answer. If you can get a longer socket strip, you can easily cut it down to 3pin.
  3. gorgon

    Bidirectional Data Line Circuitry

    I think you are making this a bit too complex. The simplest way would be to make an Interface With 2 independent multidrop lines. Each line needs to be bidirectional in nature. You then need a handshake algorithm to establish communication when connection happens, and define the direction of...
  4. gorgon

    Module Interfacing

    I can't really see your problem regarding the power distribution. If you have an 'active' module, just add a 2 pin jumper to the power output, to disconnect distribution or load from another active unit. For the passive units there are no problem, since they always will be connected to the...
  5. gorgon

    USB to serial question

    Take a look at the datasheet you can find Here: http://pdf1.alldatasheet.com/datasheet-pdf/view/15067/PHILIPS/2N2222.html To get the pin layout of the transistor. You need to get the measuring tape closer to the connector to get a proper measure. It could be a mm pitch or something like...
  6. gorgon

    USB to serial question

    Ok, the 2 middle rings are around the two transistors. You can use mostly any NPN transistor, like the 2N2222. The lower ring is only around a Connection point. Both transistor's emitters are connected to 0V. The USB Device is connected to the right side of the sketch.
  7. gorgon

    USB to serial question

    Circle, where? Depends on how resilient you want the circuit to be. I think I would have used a perf board of some kind, to give it some spine. Regarding the values of the components. M, k, R is multipliers for the resistance value. M = 1 000 000, k = 1 000, and R = 1. Always remember...
  8. gorgon

    USB to serial question

    The short answer to Your questions is: Yes, you can use the USB to TTL Device. No, you cant Connect it directly to the combro. You need to Connect a noninverting buffer, between the output from the combro, and the input on the TTL Interface. The good thing is that you have +5V available on...
  9. gorgon

    USB to serial question

    The USB to Serial TTL should not need an extra inverter to work at TTL Level. To answer what to do with pin 3, you need to read the manual for the device you need to communicate with. As far as I understand you can not connect this USB Device to a standard RS232 port.
  10. gorgon

    Why are motors so expensive?

    Maplin should be Close to you. They even say 'coming soon to Ireland' on their UK web page. http://www.maplin.co.uk/c/components
  11. gorgon

    Name question.

    Connector terminal Blocks, Luster Terminal Strip Cable Joint Connectors, there are many different names for these. Locally in Norway we call them 'sugar cubes'.
  12. gorgon

    pic programming help - controlling GSM to send message from PIC16F873A

    What is working, and how do you know it? If you use the PIC, how is the connection between the PIC and the GSM unit? Are you running it through a RS232 interface? If not, do you use inverters for the TXD and RXD? The logic signal from the PIC is inverted in the RS232 interface, and the...
  13. gorgon

    Happy new year everybody.

    Happy New Year to all of you!
  14. gorgon

    The Ultimate Tube RIAA-Amplifier?

    You're welcome ;)
  15. gorgon

    The Ultimate Tube RIAA-Amplifier?

    A. C. Cossor Ltd. was a British Company producing tubes. Related to tubes, it is just a brand name, and not a tube type. Wikipadia: http://en.wikipedia.org/wiki/A.C._Cossor
  16. gorgon

    LED application question

    As long as you want to make a bargraph, there is no big problem to light all LEDs, one after another. For the dual serial connected diodes, you need to keep the direction from the anode side of the pair, and use two different resistors for one and two LEDs lit. The trick will be to disable the...
  17. gorgon

    LED application question

    I can't see there are any faults in the parts, as long as it conform to the datasheet. As far as I can see, the 12 LEDs are configured as 4 pairs in series and 4 single LEDs. If you want to use this as a continous bargraph, you'll need to calculate the resistor values around the double LEDs...
  18. gorgon

    Accelerometer HELP!

    :D NOT 'Piece of cake' (The irony lost in translation?)
  19. gorgon

    9V bat. backup for 5V circuit

    As long as the lower voltage (5V) is the master there will always be a load on the 9V battery. To change that you need to use a MOSFET switch to turn on the battery feed when the 5V is going Down.
  20. gorgon

    Accelerometer HELP!

    A small microcontroller and the ADXL chip should give you the basic data platform. You are talking about a display, those are also available in small sizes, depending on the resolution you want. A small IR, Bluetooth or Zigbee chip in addition, makes a Complete system for you, in a watch sized...
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