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  1. Arouse1973

    Diode - Temperature

    I put my money on Maxim :)
  2. Arouse1973

    Diode - Temperature

    The BE junction of a transistor changes by the same amount. They are all PN junctions. Thanks
  3. Arouse1973

    Need Help Improving Brightness in Multiplexed 7 Segments (6 Digits)

    I use 220R from 3.6 Volts supply. They are bright enough for me. see here. Thanks Adam
  4. Arouse1973

    SMPS Load Regulation

    Another couple of questions. What frequency are you running at? What inductor are you using, do you have the data sheet. Adam
  5. Arouse1973

    Diode - Temperature

    Yes it can. A common method is to use a transistors base emitter diode. Simply pass a constant current through the transistor configured as a transdiode. Have another reference like a potential divider also with a constant current passing through it. Connect this to a comparator and calibrate...
  6. Arouse1973

    SMPS Load Regulation

    I just noticed R12 and C5, why are you doing this? This will effect the feedback signal and could cause you issues. Remove this and see if it helps. Adam
  7. Arouse1973

    SMPS Load Regulation

    The bottom part of the 0V plane seems to be isolated, I guess you have not posted the full layer count. Can you post the Gerber for me? What inductor are you using? Post the datasheet link. What is your input voltage +15V? Thanks Adam
  8. Arouse1973

    Need Help w/ Custom Portable Speaker Schematic

    Sorry I just called you Martin for some reason :confused:, I am tired, I am off to bed! Adam
  9. Arouse1973

    Need Help w/ Custom Portable Speaker Schematic

    Well the main component Martin is the amplifier. You will need those components first and you build the circuit and attach the speakers to the output, being they are the same you could have two parallel lots of two in series giving you 8 Ohms. Although the amplifier can drive much lower...
  10. Arouse1973

    Need Help w/ Custom Portable Speaker Schematic

    Please elaborate on your situation? I don't understand. Thanks Adam
  11. Arouse1973

    Need Help w/ Custom Portable Speaker Schematic

    The schematic is in the datasheets I sent you with all the other components. I don't quite understand your response. Thanks Adam
  12. Arouse1973

    Need Help w/ Custom Portable Speaker Schematic

    Or you can bridge the TDA2005 http://www.st.com/web/en/resource/technical/document/datasheet/CD00000124.pdf Adam
  13. Arouse1973

    Need Help w/ Custom Portable Speaker Schematic

    I have used this device before. Remember to leave room for a heat sink. http://www.st.com/web/en/resource/technical/document/datasheet/CD00276281.pdf Thanks Adam
  14. Arouse1973

    Need Help w/ Custom Portable Speaker Schematic

    Now do you want the enjoyment of building a circuit or are you happy to have a module. Adam
  15. Arouse1973

    Need Help w/ Custom Portable Speaker Schematic

    Hello One important question, what are the wattage and impedance of the speakers you plan to use? Thanks Adam
  16. Arouse1973

    RF receiver circuit

    You have to choose a filter response before you can start to work on this. Then you can use specific filter tables and normalising techniques as one option. Adam
  17. Arouse1973

    Not enough current to trigger relay.

    :D
  18. Arouse1973

    Fm transmitter help

    This maybe the output inductor L1, trace back from the antenna and see if it connects here. The other thing is the IC may have settable gain using a resistor divider or something along those lines and no matter how you connect your whip you will be limited by the output power of the device. I...
  19. Arouse1973

    Drill bits for homemade PCBs?

    Hey Dan I use these at work to go with the milling machine. They are a bit more expensive but last a long time. You could contact a local PCB manufacture and ask them if they have any used bits you could have or purchase. They replace them often and they will certainly have enough life left in...
  20. Arouse1973

    Fm transmitter help

    Hi Simon Modifying the range of an FM transmitter from what is was designed to do is not allowed in the UK. But looking at information for the device it says 10 to 30 feet. You only have 5 feet so your antenna might be broken, I have circled what I believe to be the antenna connection. Feel free...
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