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  1. Alec_t

    Recommendation for bidirectional brushless DC motor torque on the cheap

    Welcome to EP! 'On the cheap' implies a small motor. If you put a counter-balance on the opposite side of the mechanism then a small motor would have zero static weight to move if the belt is running vertically. However, the inertial mass would be double, so rapid acceleration would be out of...
  2. Alec_t

    SERVO POSITIONING??

    What scale are you working to? 1:1 would involve enormous forces.
  3. Alec_t

    Smoothing a charging current for a phone?

    Assuming a phone battery capacity of ~3.3Ah at a voltage of 3.7V, full charge requires >12Wh of energy. If you can sustain, say, 3W output from a hand-cranked generator it will take over 4 hours to charge the phone, so it's not surprising it's a struggle. The buck-boost converter is a good idea...
  4. Alec_t

    Amplifier the smartphone headphone port voltage

    What will you use to receive the IR signal? If it's a gizmo with an irDA port then the signal you send to it needs to be a digitally coded one, not the analogue one available at the headphone output of your phone.
  5. Alec_t

    Printing on cartoon box with industrial printer

    Fine if it does.
  6. Alec_t

    Printing on cartoon box with industrial printer

    That's fine. Now, of course, you'll have to write software for both the PC and the microcontroller. You may also need some electronics to interface the (unknown) sensor to the microcontroller. Good luck with the project.
  7. Alec_t

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

    Regarding the legal side, perhaps an online Legal forum might be the best place to look for advice?
  8. Alec_t

    Printing on cartoon box with industrial printer

    RS232 serial ports and parallel ports are rare or non-existent on most modern computers. If you intend connecting the sensor via USB you will need to find one which has a USB output or else you will have to buy/build an interface to go between the sensor and the USB port.
  9. Alec_t

    Printing on cartoon box with industrial printer

    Yes, we know about the printer port. You still haven't answered the question !!!
  10. Alec_t

    Printing on cartoon box with industrial printer

    That doesn't answer the question of which computer port will read the sensor. The sensor in the link is an inductive type for sensing ferromagnetic objects at <= 2mm distance, so seems totally unsuitable for sensing cartons.
  11. Alec_t

    garage door opener

    So we can conclude that the replacement pcb is most probably ok. That leaves the door sensor as the likely culprit.
  12. Alec_t

    Question contact slot and contact conector snes

    1) That would be illogical. 2) Then I don't see how your question can be answered.
  13. Alec_t

    Question contact slot and contact conector snes

    1) It's possible. Heat and voltage transients can damage components. 2) You would have to ask the capacitor manufacturer.
  14. Alec_t

    Unable to get solenoid controlled by Arduino to work anymore

    Post a schematic of your complete circuit, including the power pack and its connections to the oother components. If the breadboard layout is exactly as per the tutorial then it is essential that the relay +ve connection is removed from its present location so that it does NOT connect to the...
  15. Alec_t

    Question contact slot and contact conector snes

    Q1: Never use the console. Q2: Never use the console, to avoid any component problem other than depolarisation.
  16. Alec_t

    Question contact slot and contact conector snes

    As kellys_eye explained, electrolytic capacitors 'dry out' over time. The liquid electrolyte inside them gradually evaporates/deteriorates. This time is shortened if they are used or stored at high temperatures. Running a console involves the generation of heat, therefore accelerating the drying...
  17. Alec_t

    garage door opener

    That doesn't sound healthy. Was your replacement board an OEM one, or a pre-used/anonymous one from some dubious online source?
  18. Alec_t

    Printing on cartoon box with industrial printer

    Nor do we, until you tell us what the sensor output specification is and what sort of computer port will be used to read the sensor output :rolleyes:. A link to the sensor datasheet would be helpful.
  19. Alec_t

    MIDI Specifications for AllNotesOff

    Why are you sending 'maximum velocity' messages in your code if you are trying to turn the notes off? In MIDI-land 'velocity' means loudness, not speed of response of the command. If I understand you correctly the 'reset all controllers' command (0xB0 0x79 0x00) should do that.
  20. Alec_t

    remove led from uln2003 driver

    There are no LEDs in the LN2003. There are diodes, but those are there to prevent damage to the IC from voltage spikes generated when inductive loads (relays, stepper motors etc) are being switched off.
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