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  1. kellys_eye

    What are those components?

    Not 'in-house' numbering but the usual non-informative SMD part numbering. There are SMD 'catalogs' available on line that can, in many instances, decode these numbers/letters to actual parts.... Here's a typical catalog: http://www.sphere.bc.ca/download/smd-codebook.pdf although simply...
  2. kellys_eye

    PlayStation2 clock is dead, but battery is still good

    Test the battery voltage under some load (say a 330 ohm resistor across it). Has the battery ever been put back into place in reverse?
  3. kellys_eye

    Need new router....which one is best for my needs?

    Assignment will be automatic - regardless, if your receiving device doesn't have 5G it won't be able to use it!
  4. kellys_eye

    Something small and loud needed.

    You could borrow my wife - but delivery costs might add up.......
  5. kellys_eye

    Mobile linear amplifier

    So could a piece of bread! Anyway, I asked the OP to respond with some voltage measurements which we have yet to see.......
  6. kellys_eye

    Need new router....which one is best for my needs?

    The frequency used depends on the device(s) receiving the data. Unless your 'receiving' devices are 5G-capable then they'll only work on the band(s) they are capable of receiving. This is why newer router/wifi devices have multi-bands - to make them backward compatible with older devices but...
  7. kellys_eye

    Mobile linear amplifier

    ???? Where the heck is '55A' going then? 13.8V?? if so then 55A equates to 760W and you should be able to 'make toast' from the radiated heat........
  8. kellys_eye

    Need new router....which one is best for my needs?

    The Arris device has it's own wi-fi capability. Why are you plugging your Netgear device into it? Surely the Arris can do it 'all-in-one'?
  9. kellys_eye

    Heatsink Mosfet

    Do you know what heat transfer characteristic you need to meet?? Obviously a thicker insulation creates a poorer path for heat but WHAT that 'poor path' really is and how it affects your device depends on how much heat you are trying to dissipate.
  10. kellys_eye

    555 flasher isnt flashing

    Check your timing component values. You are using a 100k pot where your schematic shows 10k and the 1k resistor value may be suspect (I can't see the colours properly). What about the timing capacitor? Correct value? Correct polarity?
  11. kellys_eye

    Mobile linear amplifier

    Without a signal input you should be getting only 'standby' current draw - certainly not 55A!!! What are you using to power the unit? Does the power supply have any current limiting facility? I suspect there's a short in at least one pair of output transistors and at 55A you would normally be...
  12. kellys_eye

    Need new router....which one is best for my needs?

    Pretty irrelevant regarding channels, bands etc. It all boils down to the speed at which your provider can get the data to you i.e. your broadband speed.... This download speed will be 'split' between all devices connected to the router and the more you connect the slower the individual...
  13. kellys_eye

    Advice needed so I charge my mobility scooter batteries correctly...

    What charger did the scooter come with? Surely it would be supplied with the appropriate device? A decent charger will be 'intelligent' and look after it no matter what condition it is in but USING that batteries is (as you state) an essential part of longevity so allowing them to discharge by...
  14. kellys_eye

    Mobile linear amplifier

    Looks like a solid-state set to me - where the tube? Got a schematic? The cap looks ok - some of the lead insulation is broken off (bad construction practise) but in RF applications I'd be changing it anyway.
  15. kellys_eye

    DAB radio circuit diagram

    Probably a lot more gone 'bang' than the little capacitor....... show us some pictures of the insides of the radio where the part has 'blown'.
  16. kellys_eye

    555 flasher isnt flashing

    The 555 output is pin 3 - your images show pin 3 connected to +Vcc and pin 4 as the output.......
  17. kellys_eye

    555 flasher isnt flashing

    Show us your physical layout. Most beginners invariably make a simple error with component placement.......
  18. kellys_eye

    High voltage air cored transformer

    Is there a purpose to this? There is more than one way to skin that cat and getting 20kV can be achieved using high frequency PSUs (switched mode) or ferrite cores etc. Standard laminated-core transformers will require the wiring much as you first described but this is relatively inefficient...
  19. kellys_eye

    Building a circuit [Variac]

    You can feed the output of a variac into a 1:1 isolation transformer and connect to the output but that still doesn't stop you winding the supply up past the critical 50V level at which stage an electric shock could still cause significant injury/death. Forget about variacs until you learn...
  20. kellys_eye

    Help me chose my first oscilloscope!

    'Scopes are like PC's these days. Buy one 'today' and you'll find one with better specifications (and probably cheaper) this time next year! That said, there are some very good choices out there and many sources for advice...
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