Search results

Search Forums New Posts
  1. kellys_eye

    Transformer/Rectifier repair

    Googling it seems to reveal plenty of results - I'm surprised you can't get some locally (assuming you're close or in a large-ish city).
  2. kellys_eye

    Oscillator

    Apparently not! LOL
  3. kellys_eye

    IR communication questions

    Why identify the gun? You only need to identify where the 'hit' came from - you could put a sticky label on the 'gun' or paint it a different colour..... I thought the idea was to tally the number of hits by the shooter? If you have two identical remote controls and press 'channel 1' on one...
  4. kellys_eye

    Choosing the right NTC

    How do you determine the fan isn't spinning fast enough? Did you measure the heatsink temperature to prove the fan speed is sufficient to keep it within the range required? Or are you just basing your assumption on 'the speed'? The system should (ideally) be designed to maintain the heat sink...
  5. kellys_eye

    Oscillator

    What kind of oscillator? Audio, RF, sine, square???? There are many different types and each used for specific purposes. Your request is too vague to answer with certainty.
  6. kellys_eye

    IR communication questions

    Salvage a couple of old remote controls and hard wire them for one of the push buttons (different on each) to generate the code. If you use two of the same model remotes you could obtain the relevant receiver chip and use the appropriate pin output to count shots from individual guns. Fairly...
  7. kellys_eye

    Tamperproof sink

    Time buttons are common - they are used for hall way lighting of communal areas. http://www.cef.co.uk/catalogue/categories/wiring-accessories-and-devices-time-lag-switches time lag, time delay etc - they are available as electronic or a simple 'pneumatic' version which will do the job more...
  8. kellys_eye

    Use AC speakers in Car

    You're doing something wrong somewhere..... there's no way it can work on AC and NOT work on DC. Measure the voltage across the smoothing capacitor (DC) with the AC supply connected and then with the DC connected. You should measure 'DC' (of some value) in both examples. What do you get?
  9. kellys_eye

    Use AC speakers in Car

    Did you connect the 12V DC to the blue wires going to the amplifier board?
  10. kellys_eye

    Use AC speakers in Car

    Did the speakers work originally? If yes then there's an issue with your 12V 1.3A supply. If you connected the 12V without cutting the blue wires you've probably blown the fuse in the 12V supply. The CD player you show is likely to have a relatively high output power and may well damage any...
  11. kellys_eye

    Pots!

    There are two types of potentiometer 'laws' - linear and logarithmic. For audio purposes (volume) it is common to use the logarithmic law versions - if you fit a linear version you find the problem you're experiencing i.e. 'everything happens at one end'. In tone control circuits the opposite...
  12. kellys_eye

    Use AC speakers in Car

    Cigarette socket is ideal place to take the supply from. Other than using a DC-to-AC inverter you can increase the 12V DC supply using a 'boost converter' board - readily available from many cheap Chinese outlets (via eBay etc). This can be adjusted to give the required 15-16VDC that the board...
  13. kellys_eye

    Farberware Food Processor FP3000FBS

    Not aware of the US-based warranty system but here in the UK a 12 month warranty refusla would be laughed out of court as the ruling says (not in actual words) that the item 'must be fit for purpose' and 12 months lifespan clearly doesn't represent any such thing so perhaps approaching the...
  14. kellys_eye

    Need assistance identifying this component

    Not by my reckoning. The rectification is clearly visible (D1 to D4). Some kind of VDR is still my first guess - most such supplies have them to prevent switch-on surges but the modern devices are usually pcb-mounted and a lot smaller (shiny blue or mustardy-coloured). Happy to see the OP has...
  15. kellys_eye

    Use AC speakers in Car

    Oh, and don't forget to FUSE the 12V supply (2A fuse should be ok)
  16. kellys_eye

    Use AC speakers in Car

    NO! You MUST cut the wires from the transformer (the blue ones). Cut them in the middle and apply 12V straight to them. If you want to revert to AC power then just bare the ends and twist them back together where they came from (use insulating tape too). Note that volume may well be lower...
  17. kellys_eye

    ips521 mosfet

    ...if they failed at all. In my experience such devices don't fail unless its in a spectacular fashion! The pics don't offer any suggestion that there is a problem (although that isn't a given) but from someone who declares themselves we have to ask! No shame in 'not knowing the source of...
  18. kellys_eye

    Use AC speakers in Car

    Just cut the blue wires and apply 12V DC there - polarity is irrelevant.
  19. kellys_eye

    help i.f transformer how to make one

    How does that design result in an i.f transformer? Where is the secondary?
  20. kellys_eye

    ips521 mosfet

    I've had a search but can't find a pin-for-pin replacement. It's a 5-pin MOSFET (two extra pins dedicated to supplying the supply to the internal control circuitry). It may mean looking at a LOT of the datasheets to find something to fit! It seems that the whole 'IPS' range are now marked as...
Top