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  1. B

    What is this Diode Contraption ?

    1. No. 2. No. What makes you think it is faulty...??
  2. B

    What is this Diode Contraption ?

    https://www.electronics-notes.com/articles/analogue_circuits/diode-rectifiers/full-wave-bridge-rectifier.php
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    How long will a 0.9ma nano motor unit last on a DCell?

    D cell type..??
  4. B

    Is there a device to hookup to cellphone charger

    I did say "cheap Chinese batteries"..... ;)
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    Is there a device to hookup to cellphone charger

    Cheap Chinese batteries is one reason.
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    CDs go silent occasionally

    Could start by showing some details of the cd player and a couple of photos ..
  7. B

    CDs go silent occasionally

    Check speaker
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    High power LED power/driver question.

    Any particular reason why they must be in series? There are other arrangements which would lower the voltage requirements.
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    Help procuring replacement LCD sreen

    Looks custom to me....
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    Series or Parallel?

    Nice gear..... as I said before, 9v battery as in smoke alarm (216) not enough capacity. 6 rungs of 20mA = ? 216 capacity = ? mAh/mA = ? again, I know, see if you can find out.
  11. B

    Solve this please

    Possibly took out a few electrolytics in the power supply as well.
  12. B

    Series or Parallel?

    A mic on an electric guitar is pretty pointless but one could pick up from the input to the amp or even direct from the pickup coils pre- mixer or whatever. So is it acoustic or electric...??
  13. B

    Series or Parallel?

    If the LEDs are 3v2 each then you'll get 2 in series fron a 9v supply and add a series resistor to that. 2 x 3.2 = 6.4........ 9 - 6.4 = 2.6.......... 2.6V @ 20mA = ( I know, see if you can work it out) R = E/I wattage = V x A or I squared R The remainder need to be split into 5 banks of 2...
  14. B

    Recommendations for IC noob

    Unless you are using the cmos version of the 555, 3v dc will not be enough. Assume typo error "16va"......
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    Recommendations for IC noob

    It is well within the scope of a 555 timer to do what you quote above though through the use of a couple of potentiometers on the 555.
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    Recommendations for IC noob

    What do you mean by "addressable", and why only 0402 LEDs, you'll need to be more specific. Do you have any programming experience? Making things smaller is not necessarily any easier, in fact it can entail more work on your part. Reason being, most microcontrollers will come on a pre-built...
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    Programing

    Jeremy Blum has many videos for the Arduino microcontroller system which is fairly simple and easy to get in to. He also has books on the subject and I believe updated tutorials and such. The start was at this video below and it has a group of 15 videos.
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    How do I connect the pull-up resistor to pin 7 of the LM555 timer?

    Show your circuit. If you want clear and concise information on 555 timer, go to talkingelectronics web site. Look down the left hand side index for both decriptive and animated circuits. http://www.talkingelectronics.com/te_interactive_index.html
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    Klarstein thermoelectric mini fridge stopped cooling.

    There are thermoelectric units which use freon.
  20. B

    Motion sensing

    They'd be the same as what you have already tried(ultrasonic). The PIR I showed is only around $20 mark so would be ok to test with, possible be the final coice as well.
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