Recent content by Alec_t

Search Forums New Posts
  1. Alec_t

    Did you ever make any circuit or device for yourself?

    DC motor, UK101 computer (from a kit), valve VHF tuner, valve and transistor audio amps, power supplies, battery chargers, central-heating controller, mic-to-MIDI converter, motor speed controller, voltage regulator, light dimmer, bedside light, video amp, aerial rotator, test gear, .....
  2. Alec_t

    Contact pattern shifted toward the tooth tip

    This site and forum are for electronics questions. You will likely get better answers from a car forum.
  3. Alec_t

    LED traffic light power question

    That is certainly true for simple LED arrays, but what you have is far more complex and hopefully that circuit board should provide any necessary current limiting. If it doesn't, the board could be expecting to be powered by a constant-current source. What do the instructions for it say?
  4. Alec_t

    issue with homemade DC motor + hall effect sensor

    I wondered about that, particularly as the circuit has no back-emf spike protection for when the coil current switches off. However, the power supply in the video shows switching between 0 and ~140mA, so presumably the FET is doing its stuff.
  5. Alec_t

    issue with homemade DC motor + hall effect sensor

    Have you tried re-positioning the Hall sensor?
  6. Alec_t

    Ignition coil...

    Note that there is no isolation between primary and secondary windings (which may or may not be a problem, depending on what you intend to use the coil for).
  7. Alec_t

    Buck converter calculation does not match with LTspice results

    It is good practice to adding meaningful labels to significant nodes on your schematics. 'n005' is not helpful unless the reader can actually run your sim and hunt for it. What is the blue trace?
  8. Alec_t

    Buck converter calculation does not match with LTspice results

    If a sim is running extremely slowly and taking forever, it can be because any default circuit components in it are ideal ones, e.g. an inductor or voltage source with zero resistance, a diode with infinite cut-off function, a capacitor with no leakage. Adding some parasitic resistance etc to...
  9. Alec_t

    Buck converter calculation does not match with LTspice results

    The crystal ball is cloudy this morning. Without seeing Fig 6-3a we can't tell if your LTspice circuit is correct.
  10. Alec_t

    motor of record player running too fast

    @Gregoose94 This thread is 9 years old ! You'll be lucky if you get the reply you want. Better to start your own thread and post make/model details of your player.
  11. Alec_t

    Damaged ecu -

    Commercial ECUs will likely have their code protected and unreadable externally by normal means, to prevent cloning.
  12. Alec_t

    does it exists better "Third Helping Hands" tool for fine adjustments ?

    Would one of these suit?
  13. Alec_t

    Damaged ecu -

    The via might have connected to more than the visible layers if the pcb has internal layers. I'm not familiar with ecu boards.
  14. Alec_t

    Damaged ecu -

    I've no idea if that's the case. It looks as though a via (silver-coloured dot) in that section has vanished. It would have connected through the board to some other layer.
  15. Alec_t

    Damaged ecu -

    Even with all the info, how would you get access to both sides of the circuit board for testing and repairing? Looks as though you've already had to use an angle grinder to expose what's in the posted pics.
See more
Top