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  1. Alec_t

    Pionero VSX 1021 K Home Theater Receiver Volume Problem .

    Welcome to EP! A defective capacitor could be the cause, but without a schematic of the receiver it'll be tricky to track down. Can you post a well-focussed close-up of the circuit board, especially the area near the volume control (clear enough that component numbering/marking can be read)? Do...
  2. Alec_t

    20 Watt LED Dimmer Circuit diagram

    The diagram would need to be based on answers to the questions you have been asked. The ball is in your court.
  3. Alec_t

    Smallest solar power source

    Solar power would have a fair infra-red content, but if that is a concern then I'm sure there are similar-size visible-light phototransistors readily available.
  4. Alec_t

    Convert DC to AC

    Does your transformer have a centre-tapped 12V winding?
  5. Alec_t

    Ceramic resistor information

    That depends of the resistance and the current through it. Power dissipated = resistance x current-squared.
  6. Alec_t

    Help Removing Bulbs from Mini Christmas String

    That is potentially (pun intended) LETHAL, since there would be no mains isolation and any component failure could leave some point of the circuit at mains voltage. Much safer to use LEDs as stated.
  7. Alec_t

    Smallest solar power source

    Don't see why it couldn't be operated in photo-voltaic mode, but I've no idea how much current you could draw.
  8. Alec_t

    Smallest solar power source

    How about a bunch of these?
  9. Alec_t

    Help with Class D amplifier

    What voltage do you have on pins 14 and 15?
  10. Alec_t

    Beehive scale

    :confused: I don't see how you can get notification of a 1kg change if the holes are at 10kg intervals? If you have 100 hives, will you want one of these gadgets at each hive? If so, you will need some way of sending a hive ID code.
  11. Alec_t

    supercapcacitor based battery

    If you want to use the power over a long period you must minimise the load current. A DC-DC converter will be needed if the load requires a constant voltage (as many do; hence the use of batteries as Bob says).
  12. Alec_t

    Sock resistance reading

    I think you (or a mod) should edit the title of your thread ;).
  13. Alec_t

    Connecting a powersource directly to a SLA Battery

    A 12V supply would maintain a '12V' battery in a partly-discharged state.
  14. Alec_t

    Checking Battery rating

    Believe those claims. Over-charging or over-discharging lithium cells is dangerous. The better cells have safety circuits attached to prevent misuse.
  15. Alec_t

    Beginner question: How do I let a 12v 36w current through only when a 1v signal comes from a source?

    I hope by 'voltmeter' you mean a DMM (digital multi-meter)? A DMM has Ohms ranges, current ranges and voltage ranges, and usually a diode test function. The latter would help to detect if D4 is open-circui or short-circuit and an Ohms range would enable R22 to be checked for open-circuit.
  16. Alec_t

    latching pushbutton help

    Welcome to EP! What is the motor spec? AC? DC? Brushless? Voltage? Current? .....?
  17. Alec_t

    Beginner question: How do I let a 12v 36w current through only when a 1v signal comes from a source?

    R22 and D4 might be worth checking. Zero-Ohm resistors are sometimes marked '0'.
  18. Alec_t

    Hi everyone! Can i ask why is there a diode here?

    The circuit operation would seem critically dependent on the buzzer type/properties, which are not given. The diode may be there to block a back-emf spike generated by the buzzer ...... who knows? The R1-R3 values are surprisingly low. Where did you get this circuit?
  19. Alec_t

    Beginner question: How do I let a 12v 36w current through only when a 1v signal comes from a source?

    Unfortunately, those pics are neither clear nor close-up enough to read component identifiers :(. Can you post better ones here, using the 'Upload a file' button? Can you post the schematic?
  20. Alec_t

    Beginner question: How do I let a 12v 36w current through only when a 1v signal comes from a source?

    Using the 1V signal to switch the heating element would be pretty straightforward, but as Adam said, it's best to find the cause of the problem first.
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