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  1. KrisBlueNZ

    So, I have an idea for a prototype...

    Fair enough. Have a look at this thread: https://www.electronicspoint.com/threads/small-circuit-needed-for-new-product-design-help.268763/ It didn't go anywhere in the end, but there's some relevant general information in there that will give you an idea of what's involved in a project like that.
  2. KrisBlueNZ

    Harman/Kardon HK6500. Loudness not working when button is pressed

    OK, if you're happy, I'm happy. You might want to crack it open in a month or so, to check that nothing is getting discoloured by the heat from those heatsinks.
  3. KrisBlueNZ

    How to delete an old email address on Google account

    I access gmail through their imap interface, using Thunderbird (or you could probably use Outlook), instead of the web-based interface. I don't see any of that crap. That arm of Google seems to want to become the next Facebook. Well, we already have one Facebook, and that's bad enough. No one...
  4. KrisBlueNZ

    Capacitor Value

    Electrolytic capacitors are polarised! The originals are non-polarised, and for a reason. Don't use electrolytics in that part of the circuit! Are these capacitors are in some AC mains input circuitry?
  5. KrisBlueNZ

    Power supply

    OK, now we have some idea of what the problem is. That's quite a large and complicated power supply. So the 3.3V and 5V rails are OK, but all of the others are zero? If there's an enable signal from the printer, it's possible the fault is on the printer, not on the power supply. Can you try...
  6. KrisBlueNZ

    12V - 350V 200mA converter for motorcycle CDI

    This will be the third time I tell you that the 555-based circuit is not a suitable starting point for a high-power boost converter. I have removed "555" from the thread title. Thanks for posting those diagrams. Forget your primary question. Forget the 555 circuit. You're right, the boost...
  7. KrisBlueNZ

    Combining an Amplifier with a Voice Changer?

    OK. You may need to get a multimeter. You can pick up a "cheap and Chinese" one on eBay for under USD 10.
  8. KrisBlueNZ

    Will This Charging Circuit Work Well.?

    Harald is quite right, and you are being unnecessarily rude. A solar cell is a voltage source. A load will draw current from it. If the load tries to draw too much current, the voltage will drop. Just like any voltage source. There is no requirement to draw the maximum rated current from a...
  9. KrisBlueNZ

    Power supply

    So what's the problem? Are some of the voltages wrong? You said you need to know the pin descriptions for the connector. Why? Do you want to use this power supply with an HP printer but when you plug it in, the printer doesn't work? Have you made a list of the voltages the power supply is...
  10. KrisBlueNZ

    Voltage Regulator IC

    Good. The Texas Instruments part is not just an equivalent; Texas Instruments absorbed the original manufacturer, National Semiconductor, so it's identical. You must have found one that's been stockpiled, since TI don't make it in DIP any longer.
  11. KrisBlueNZ

    Combining an Amplifier with a Voice Changer?

    Yes, it should be possible. But you'll need to provide good clear photos of the circuit boards in both units (see https://www.electronicspoint.com/resources/how-to-take-photos-of-circuit-boards.6/ for hints on how to take good photos) and you'll probably need to do some experimenting and testing...
  12. KrisBlueNZ

    Power supply

    Hi masoud and welcome to Electronics Point :) If you don't know what the output voltages are supposed to be, how do you know that some of the outputs "work well" and others don't work? Is the board manufactured by Hewlett Packard? Or is it made by another company and supplied by Hewlett...
  13. KrisBlueNZ

    How to delete an old email address on Google account

    I've given this thread an appropriate title and moved it to an appropriate forum. I can't help - I have no special knowledge on the subject. All I can suggest is use Google's tutorials and help facilities.
  14. KrisBlueNZ

    Common Base RF amp - CE feedback capacitor?

    I guess you're referring to this circuit: I'm afraid I can't answer your question. I'm just posting here to save others the trouble of finding the schematic.
  15. KrisBlueNZ

    Will This Charging Circuit Work Well.?

    Yes I do, thanks Dave :-)
  16. KrisBlueNZ

    Will This Charging Circuit Work Well.?

    Hi Carlos and welcome to Electronics Point :) I don't think I'll ever understand why people draw schematics so strangely. It makes them bigger and much harder to understand. Here's that same circuit drawn up so the subcircuits are easily recognisable. So clearly D1 protects the circuit...
  17. KrisBlueNZ

    So, I have an idea for a prototype...

    Have you considered an Android "smartwatch"? There's probably a suitable application available...
  18. KrisBlueNZ

    Resistors in Parallel

    Yeah, let us know the outcome :-)
  19. KrisBlueNZ

    Using phone mp3 jack for power.

    First check that your phone will ring through the headphones. With some phones, when a call or text arrives when headphones are plugged in, the phone will just mute the headphones and play the ringing sound through the speaker. Assuming the phone will send the ringing sound to the headphone...
  20. KrisBlueNZ

    3D Printed Smart Watch Bluetooth/UART Guidance

    Hi Will and welcome to Electronics Point. Electronics Point has a no-spam policy that we police aggressively. The video you linked to in your post is of a promotional nature so I have removed it and closed this thread until the moderators have decided whether or not to allow it. In the...
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