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  1. S

    What way around are these voltage regulators?

    I think these two black components with 1Aomega written on them are voltage regulators. Can anyone advise me what the pinout will be? I've tried searching for a pinout for a SMD voltage regulator with a dot on it but failed. Thanks!
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    Using CCFLs from broken laptop screens - how well matched do tubes and power supplies need to be?

    Thanks. I really want to use all these things I have lying around though (or else I'd just buy some light bulbs!) I have one inverter which has just four input pins. For some reason one of the pins has a much wider conductor; does that hint at what it's function is? I'm expecting VCC, GRN, ADJ...
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    Using CCFLs from broken laptop screens - how well matched do tubes and power supplies need to be?

    I've taken apart some broken laptop screens to get the CCFLs and their power inverters. Most of the CCFLs are matched with their inverters but some came to me already separated. Are they likely to work with each other's inverters? Realistically, is a CCFL liable to explode with another CCFL's...
  4. S

    Gold-coloured areas on laptop circuit boards - gold or pyrite?

    Your local waste disposal facility probably has an area for you to dispose of domestic electronics waste. Mine does in Edinburgh and my mum gets hers collected fortnightly in Cheshire.
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    "random" blinking LEDs: purpose-built circuit, or Arduino or =

    Has this projected been able to proceed? It sounds really interesting.
  6. S

    Gold-coloured areas on laptop circuit boards - gold or pyrite?

    I'm taking apart some broken laptop screens I received for free so I can get the CCFLs. I figured I'd also retain any gold plated connectors which I want to save until I have enough to recover the gold and buy a burger! There are some things that are gold-coloured but I wouldn't expect to...
  7. S

    How to get 3.3 V from a charged LiPo battery?

    I've discovered that the board has its own regulator and will happily accept 3.3 V to 12 V so no external parts are needed!
  8. S

    How to get 3.3 V from a charged LiPo battery?

    What about one of these buck boost things?
  9. S

    How to get 3.3 V from a charged LiPo battery?

    I would like to power an Arduino Mini/Nano at 3.3 V using a LiPo phone battery with max 4.2 V. How do I render the voltage from the battery suitable for the Arduino? 4.2 V seems to be less than the minimum for all the regulators I've looked at. What should I look for? Thanks!
  10. S

    Confused by circuit. A to B and B to C implies A to C?

    I forgot to say that I disconnected the battery so the voltage of the battery doesn't really matter. It has three discharged NiCd cells and stands at ~3 V presently. The circuit references aren't meaningless; they show the points where I'm connecting the DMM to check for continuity. Filming a...
  11. S

    Confused by circuit. A to B and B to C implies A to C?

    I made a simple circuit to take current from my dynamo to charge batteries and power lights in parallel. I'm having a problem that doesn't make any sense to me. For simple wires (semi-conductors) I would expect that if A and B are connected (<2 ohms) and B and C are connected (<2 ohms) then A...
  12. S

    How to determine voltage on transformer

    Sorry; I thought the forum software automatically limited the size of the image. Thanks for the information!
  13. S

    How to determine voltage on transformer

    I have what I think is a transformer and I've got mains voltage going in at the top of the image and I'm trying to measure the voltage that I get from the bottom of the image with a DMM set to 500 V AC. The top resistor is 33K and the bottom resistor is 20R. When I apply mains voltage to this...
  14. S

    Will measuring the resistance of a capacitor damage it?

    Thanks.
  15. S

    Will measuring the resistance of a capacitor damage it?

    Is that a snide way of saying no? My DMM is a Uni-T UT61E.
  16. S

    Will measuring the resistance of a capacitor damage it?

    If I put a DMM across a capacitor (say 10 V rating) and measure the resistance, will the DMM increase voltage beyond the rating of the capacitor and cause damage?
  17. S

    Changing the timer of an old battery charger to a longer time

    Thanks, Harald; you're right! The capacitor does go to pin 9 and via a resistor to pin 10.
  18. S

    Changing the timer of an old battery charger to a longer time

    Hi Harald, the chip is HCF4060BE WK01P0352. It's definitely got something to do with the timing. There are a lot of versions of the chip but mine is pretty old, I think and no longer manufactured. I found a datasheet for HCF4060B without the E but it's very hard to understand the system of...
  19. S

    Changing the timer of an old battery charger to a longer time

    I have a Uniross X-press 300 battery charger and it just like this but I think I have an older version with lower current: The selector switch toggles between a six or nine hour charge time and since battery capacities have increased significantly since I bought it about 15 years ago, it...
  20. S

    Want to increase brightness of LED headlight

    Is the current reading on the power supply affected by the frequency? I put a capacitor across the PSU and there was no change in the current displayed. I think I'm gonna use a 68 uH inductor since the LEDs are then plenty bright and the power supply reports a 40-50 mA consumption which is...
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