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  1. Alec_t

    Future

    In view of your lack of experience, building something to work with mains voltage (using a blender motor suggests that is your intention) is not advisable. Get it wrong and your first project could be your last ;). Better/safer to cut your electronics teeth on a battery powered project.
  2. Alec_t

    serial regulator

    That's a calculation I can do in my own head :). It's a bit more than when the switch is closed, but not the ~200mA you allege ;). Are you asking for an answer for yourself, Colin, or asking the OP to do the math?
  3. Alec_t

    serial regulator

    I certainly can, but this thread is all about encouraging the OP to do the calculations. How do you get that figure? R1 is the main current-limiter for the 16V zener. The only way 200mA could flow would be if there were reverse-voltage breakdown of the transistor collector-base junction.
  4. Alec_t

    Yamaha RX - V 675 wont power up

    I'd be surprised if Yamaha offered a programming service. Why not contact Yamaha?
  5. Alec_t

    serial regulator

    Not so, Colin. Spice confirms them (as do members on another forum where the same topic is raised). Eh? Most of the current goes through the 150Ω resistor, not through the zener. So the rest of the world is wrong :). Hmmm.
  6. Alec_t

    serial regulator

    Got it!
  7. Alec_t

    serial regulator

    Better, but you're not quite there yet ;). No. You're forgetting that some of IR5 flows through D2.
  8. Alec_t

    Yamaha RX - V 675 wont power up

    You would have to re-program the new IC the same as the original.
  9. Alec_t

    Convert 110v 60Hz to 230v 50Hz

    Don't know how you managed that :confused: This is what the calculator shows me: Edit: In reality, the power factor will be something less than 1, e.g. 0.8.
  10. Alec_t

    Convert 110v 60Hz to 230v 50Hz

    I think you mean 8.7A? A 2kW motor is about 2000VA.
  11. Alec_t

    Piezo element microphone

    If one face of the piezo disc is in contact with the uke, the other face ideally should be bonded to an inertial mass to maximise sensitivity. That might not be necessary, and of course would make the mic more prominent.
  12. Alec_t

    Piezo element microphone

    I'm sure it could be made to work. The Logitech has a mic input, so the pre-amp probably wouldn't need to be high gain.
  13. Alec_t

    Help with compatability

    Certainly Fig 2:27 indicates the terminals for output #1 as 10 and 2 for the AR model. Not the clearest of manuals, given the table I attached in post #14 :rolleyes:. Your measurement confirms that the controller is actually driving 19mA via terminals 10 and 2 (assuming your '1k' is accurately...
  14. Alec_t

    serial regulator

    Sadly, it's not all correct. This bit is: "Ue = 16 - 0,6 = 15,4V". Starting with that, work out the currents in R6 and RL. The total of those two gives Ie.
  15. Alec_t

    Piezo element microphone

    Depends on the (presumably powered) speaker spec, but you'd probably need a pre-amp between mic and speaker. If the speaker is un-powered then you'd also need an amplifier.
  16. Alec_t

    Ultrasound Modules

    I doubt you'll find any which are good and cheap. Did you try what was suggested in post #3?
  17. Alec_t

    Shredder Repair (Fellowes)

    Check the dimensions against those of the original transformer. If you've got space for it, go for a slightly larger one, which is less likely to be as stressed as the original. Let's hope the problem was the transformer; not something else which overloaded the transformer.
  18. Alec_t

    Help with compatability

    See post #3 ;).
  19. Alec_t

    Need input on design for LED circuit

    Welcome to EP! Your circuit seems to have all red anodes connected to ground? It's unclear whether all the cathodes are connected to ground or to the tops of the rheostats? Where do the blue and green anodes connect? LED brightness would normally be controlled by varying the current through the...
  20. Alec_t

    Shredder Repair (Fellowes)

    I can't believe a shredder would worry about a 0.6V difference.
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