Search results

Search Forums New Posts
  1. KrisBlueNZ

    Digital Terrestrial Receiver PSU problem

    It's usually the switching device, which is usually a MOSFET. It's connected with its drain (middle terminal) to the bottom end of the primary winding of the main transformer and its source (right terminal) to the negative side of the main smoothing capacitor, often with a low-value resistor in...
  2. KrisBlueNZ

    Timing Circuit? Counter?

    Well, I can generate a netlist for the connections in the schematic... You would need to use the same component references as my schematic uses. You would need to translate the component type names to outlines, either manually or through a list, or place the components manually before you load...
  3. KrisBlueNZ

    Chicken Coop Door Opener

    That looks good Dan! I like your clearly worded comments. This is really important when you come back to add a feature in six months' time. You need to be able to get a clear understanding of how it works, quickly. I suggest a change to the comment in line 23: from: Input pin with door fully...
  4. KrisBlueNZ

    wiring help for a bass guitar

    OK, as Gryd3 says, your options are limited if you go passive. You can either connect all five pickups in series, in which case you will get a fairly high output impedance, or you can connect them in parallel, with or without a series resistor for each pickup, in which case you get a lower...
  5. KrisBlueNZ

    Combining an Amplifier with a Voice Changer?

    OK. I need to try to figure out how the volume control on the amplifier board is connected. Can you take a photo, as close as possible without being blurry, looking at the same angle as your top side photo with the "VOLUME", "MIC" etc annotations, but also with a bright direct light from behind...
  6. KrisBlueNZ

    Does anyone recognise this symbol?

    That seems like a good explanation Dave. The description doesn't really sound like a fusible resistor, but we will see... Joanne, what is the model number of the TV set? Can you post in-focus pictures of both sides of the circuit board in that area?
  7. KrisBlueNZ

    Does anyone recognise this symbol?

    Probably best to wait till then. It seems odd that the symbol looks like a resistor with an obround around it, it looks like a fuse or maybe a spark gap, and it's arcing. Doesn't sound like anything I recognise. Is there a circuit reference printed on the board beside the position? I'm going...
  8. KrisBlueNZ

    Does anyone recognise this symbol?

    No. Can you upload a photo of it?
  9. KrisBlueNZ

    Does anyone recognise this symbol?

    Got it. I'm not sure what it is either. Could be a thermistor. What does the component look like?
  10. KrisBlueNZ

    Does anyone recognise this symbol?

    Hi Joanne and welcome to Electronics Point :-) Can you upload some pictures? The component and/or its circuit symbol?
  11. KrisBlueNZ

    Combining an Amplifier with a Voice Changer?

    OK. This should be pretty straightforward. The only tricky part will be matching the signal levels. We need to make sure that the signal level from the output of the microphone preamplifier on the amplifier board is properly matched to the input of the voice changer, and that the output of the...
  12. KrisBlueNZ

    Help Identify IC

    Looks like it could be a member of the TOP series. Have a look at this data sheet: http://www.powerint.com/sites/default/files/product-docs/top232-234.pdf Pins 2, 3, 7 and 8 are all grounded on your IC, and so is pin 1. On the TOP devices this is called the M (mode) pin and grounding it...
  13. KrisBlueNZ

    Help Identify IC

    That looks like a Power Integrations logo on it. It looks like it's driving the power transformer. It will probably be one of the following, but without being able to read the part number in the photo, I couldn't say which one...
  14. KrisBlueNZ

    Help Identify IC

    Hi Eric and welcome to Electronics Point :-) Is there an IC circled in that picture? If so, I can't find it. I did find Waldo though :-)
  15. KrisBlueNZ

    Uploading Image problems

    I'll ask Ian whether he has any suggestions.
  16. KrisBlueNZ

    Uploading Image problems

    Have you had that page open in your browser for a while? Try reloading the page (copy your text first so it doesn't get lost) then try again. If that doesn't work, go to the forum page then go back to your thread. As a last resort, log out then log back in.
  17. KrisBlueNZ

    Uploading Image problems

    Click the "Upload a File" button below your text. This pops up a file selection dialog box that you can use to browse to the location where your images are stored. Select the image(s) you want to upload. You can select more than one image to upload at a time. Then click Open. The images will be...
  18. KrisBlueNZ

    Combining an Amplifier with a Voice Changer?

    OK, that's a good start. I see what you mean about the voice changer. It's pretty nasty. It looks like one of the end wires on the grey ribbon may not be properly soldered on the switch board. 1. On the voice changer, can you test for continuity (direct electrical connection) between the black...
  19. KrisBlueNZ

    Treadmill, strange problem on Motor control board

    Good one!
  20. KrisBlueNZ

    Home made valve oscilloscope. Version 2.0

    Sounds really cool, Miguel! I'm keen to see the photos!
Top