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  1. Arouse1973

    battery pack question

    How long has it been since it was last recharged? What load is the battery pack supplying? Thanks Adam
  2. Arouse1973

    PCB VIA

    Yes they look like test Vias. Normally they would be masked and remain gold or silver plated.
  3. Arouse1973

    Design review: Fully differential telescopic Operational amplifier.

    Hello I am interested in knowing what program you are using to simulate this? It looks like you are confident in your calculation so I am wondering why you can not fault find this. What is your background and what experience do you have. Thanks Adam
  4. Arouse1973

    Is there a microchip that can measure current to pA on many channels ?

    As long as you have the correct interface circuitry like a trans-impedance amplifier then most micros would be able to measure the amplified signal on an A-D pin. It's difficult measuring currents that low so just wondering what the application is? Thanks Adam
  5. Arouse1973

    DC DC buck to LDO

    Connecting a LDO to the output of the buck converter is something that is done to reduce noise and improve transient response if required. Because of the improved efficiency of Synchronous mode operation I would choose this in your situation because you are introducing a lower efficiency device...
  6. Arouse1973

    Multiple LED Driving

    That's ok, wouldn't it be a dull world if everyone agreed with each other. :)
  7. Arouse1973

    Multiple LED Driving

    It's more practical than that. If you are making a voltage measurement with a scope it can be quite easy to slip and possibly short out the cathode of the LED or power supply. Thanks Adam
  8. Arouse1973

    Multiple LED Driving

    Give it a go but make sure you connect the current limiting resistor to the anode :)
  9. Arouse1973

    Transistor as a switch

    Can I ask everyone a question please? When a transistor is in saturation do you think if you increase the base emitter voltage would you expect an increase in collector current? Thanks Adam
  10. Arouse1973

    Transistor as a switch

    Interesting play with words isn't it. What does fully on mean and is it anymore important than half on or quarter on. What do we benefit in general from using the words saturation, fully on, fully off etc. For example a supplier might consider their transistor is off at 0.5 volts. But you...
  11. Arouse1973

    Transistor as a switch

    Blast from the past lol
  12. Arouse1973

    Who's right and who's wrong?

    I know mate but other things were more important :).
  13. Arouse1973

    Who's right and who's wrong?

    Hello darling :) You remember lol. I thought I would jump in again on a lite note. I got fed up a bit with some of the posts and then COVID hit. Will pop in now and then
  14. Arouse1973

    Who's right and who's wrong?

    Do we have to define if it is constant current or foldback limiting?
  15. Arouse1973

    Rest in Peace, Kris

    Wow a blast from the past, hope you have been keeping well and good to hear it's nearly working :)
  16. Arouse1973

    QW-ms305D setting constant current?

    Hi mate, not been getting any emails. PM me your email and I will respond. Ads
  17. Arouse1973

    QW-ms305D setting constant current?

    Hi Martin, it's been a while, hope you are well. Got any pics of these PSUs. Ads
  18. Arouse1973

    UK specific laws regarding the sale of self made electrical goods?

    It is paramount that your product is safe to use. Please don't skimp on testing. I can't express how very important it is. I have been involved in EMC product testing for 20 years and you will surprised what people try and get away with. Remember CE marking is the bare minimum you need. I have...
  19. Arouse1973

    UK specific laws regarding the sale of self made electrical goods?

    If you install a CE marked product into your product and you "Bring to Market" another product which contains a CE marked product you still have to have the testing done. Adam
  20. Arouse1973

    common mode choke

    Or you could re-wind it with the correct size of enamel wire? Just mark the start and end point with a permanent marker pen and count the number of turns. It will be near enough. Adam
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