Search results

Search Forums New Posts
  1. Alec_t

    Reversing polarity through signal from mouse switch

    Here's one way you could do it, using a dual-coil DPDT latching relay controlled by the normally-open contacts of the limit switches :- The resistors and capacitors are for suppressing any arcing at the switch contacts. Resistors are 1/4W. Caps are film type. If the motor running current is...
  2. Alec_t

    function but turns on once the sleep button is pre

    S201 may be non-standard but S226 looks like a standard momentary tact switch, as found in various electronic gizmos (so perhaps rescuable from dead equipment)? Those switches come in various sizes, so if you find one with the right dimensions it should do the job.
  3. Alec_t

    Reversing polarity through signal from mouse switch

    From the mechanism details you have given, I don't think there's any risk of inertia causing the mechanism to come up hard against an end stop before it has had a chance to be reversed, and at 30mA current the motor is unlikely to be harmed by a sudden reversal. That simplifies things...
  4. Alec_t

    Reversing polarity through signal from mouse switch

    What are the voltage/current/rpm ratings of the mechanism ? How long does it take to travel the 180° ?
  5. Alec_t

    function but turns on once the sleep button is pre

    Have you tried the power-up technique given in the service manual ?
  6. Alec_t

    Unusual Touchscreen Monitor Power Supply - Never saw before

    My guess was wrong. The user manual confirms the 8-pin socket is power input :-
  7. Alec_t

    Unusual Touchscreen Monitor Power Supply - Never saw before

    Isn't the power input socket that big black thing on the right? I would have guessed the 8-pin socket on the left is a power output to feed external peripherals.
  8. Alec_t

    Battery ruined by diode and LED

    Have you checked in at Battery University to see how lithium batteries should be charged?
  9. Alec_t

    More current to stepper motor

    You could use the ecu to control power MOSFETs to switch the stepper motor. The devil will be in the details.
  10. Alec_t

    Reverse Day/Night

    Here you go :-
  11. Alec_t

    Reverse Day/Night

    You could use one of those devices to switch the coil of a SPDT or DPDT relay. Use the relay contacts to switch the pump.
  12. Alec_t

    DC voltage blocker - Blocking AC too?

    Indeed it can. You can get round that by connecting two electrolytics in series, back-to-back, i.e. you connect then +--+.
  13. Alec_t

    DC voltage blocker - Blocking AC too?

    I'd ditch that textbook, but don't have any recommendations. Other members here may have.
  14. Alec_t

    DC voltage blocker - Blocking AC too?

    Welcome to EP! The clue is in the name Light Emitting Diode. The LED is rectifying the current, so the caps charge up like they did with the battery as power source. Let's hope you had the LED the right way round, as electrolytic caps hate to be charged with the wrong polarity. By the way, with...
  15. Alec_t

    IR and seeing it...

    Welcome to EP! 'Straight up' implies a uni-directional beam. Any IR sensor would have to be directly above the IR source to detect it. For a beacon you would need instead either an omnidirectional IR source, an array of differently-oriented beams, or a beam rotating in a horizontal plane (like a...
  16. Alec_t

    Chasing down excessive power consumption

    Unwire the individual live wire feeds to the smoke alarms. Is there still current in that breaker circuit?
  17. Alec_t

    Replacement micro switch for my mitre saw

    Microswitches are generic parts. If you find one with the right mounting-hole size and spacing there's a good chance the other dimensions and ratings will match your switch.
  18. Alec_t

    Chasing down excessive power consumption

    As you obviously have a Watt meter you should be able to identify the current-hungry culprits by switching on only one breaker at a time and switching on (or plugging in) only one appliance at a time on the active circuit.
  19. Alec_t

    A Stretch

    Not necessarily, depending on inherent input offset.
  20. Alec_t

    A Stretch

    I suggest you make sure that they are. If you are referring to the various points in your circuit that are marked as grounds then yes, they all connect to the negative rail. That rail also has to connect to the guitar ground and the Fender ground.
View older results
Top