Search results

Search Forums New Posts
  1. Arouse1973

    Audio aplifier with faulty 12VDC Power supply

    Found some origional transistors. But using tablet and cant work out how to copy link. I will post tomorrow
  2. Arouse1973

    Audio aplifier with faulty 12VDC Power supply

    Looks like they might be BJT devices.
  3. Arouse1973

    Audio aplifier with faulty 12VDC Power supply

    VDO is still going by the looks of it. They might not do audio amps anymore.
  4. Arouse1973

    Audio aplifier with faulty 12VDC Power supply

    I'll have a quick look. Does it have a model number or do you think VDO dayton is it?
  5. Arouse1973

    Audio aplifier with faulty 12VDC Power supply

    No crispy components then :) Have you tried to get a service manual? Whats the make of the AMP? Could be the power mosfets.
  6. Arouse1973

    Audio aplifier with faulty 12VDC Power supply

    Nice one
  7. Arouse1973

    Audio aplifier with faulty 12VDC Power supply

    Got any clear photo? cheers Adam
  8. Arouse1973

    Why does my op amp sink/source current?

    I guessed you would be working out the average power out in software? Adam
  9. Arouse1973

    Wondering about the proper steps from prototyping to PCB board.

    No your friend is not correct. If we ignore EMC issues for the moment and just look at the manufacturing side. If you are hand soldering components then a copper plane only on one side is ok. The problem comes when your PCB is manufactured in quantity and goes through an automated solder bath or...
  10. Arouse1973

    Why does my op amp sink/source current?

    Ok Matt no probs
  11. Arouse1973

    Why does my op amp sink/source current?

    You might not need a differential amplifier for this. The Mosfet will connect the inverting terminals gain components to 0V. Just try and remove R4. Or are you adjusting the current by PWM on the gate? you don't say. Adam
  12. Arouse1973

    Wondering about the proper steps from prototyping to PCB board.

    What do you mean copper pour on top is wrong?
  13. Arouse1973

    Wondering about the proper steps from prototyping to PCB board.

    It helps to have software that has a DRC (Design rule check) so you can see if there are any shorts or opens that you might have created. I would always draw the schematic first in the software I was intending to layout the PCB in. And then when you come to do the breadboard / proto-board design...
  14. Arouse1973

    Troublesome powersupply

    Depends where you have connected the input. If you just connected the d.c supply where the transformer used to be then you will have 2 diode drops. You might have just connected the 0V to the 0V of the circuit board and the positive to anode of the input diode on the bridge, then you would have...
  15. Arouse1973

    Troublesome powersupply

    Yes I agree Olive2222 . I would remove the diodes also. The output transistor will also play a major part in the reduction of the output voltage. The output transistor will have a base emitter voltage drop which will vary with output current. If the OP could supply the part numbers of the...
  16. Arouse1973

    help! would this still work

    Yep me also
  17. Arouse1973

    Troublesome powersupply

    What voltage is it dropping to? Where are you connecting the d.c input to. You need to connect it after the bridge rectifier. Adam
  18. Arouse1973

    Rapid Prototyping

    Yes its not new. I saw this sort of thing 10 years ago, but much more exspensive. One similar process was to mill small grooves in the PCB and then fill them with a silver paste to make tracks.
  19. Arouse1973

    Hello from Gryd3!

    Hi Mate
  20. Arouse1973

    Need help with analogue question

    I don't think we will be doing that. But here it is a bit neater. Adam
Top