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  1. kellys_eye

    old car stereo LCD backlight

    From Cambridge English Dictionary....... ain't not standard UK short form of am not, is not, are not, has not, or have not: He ain't going. "Can I have a cigarette?" "I ain't got none left." -------------------------- You've just been buuuuurned..........
  2. kellys_eye

    old car stereo LCD backlight

    Rather than 'make work' and discuss the change of colour it would be prudent to fix the initial issue of backlight loss and go from there. It's often easy to talk/consider changing the colour but quite difficult for the uninitiated and you are likely to not even notice or consider the...
  3. kellys_eye

    12VDC to 230VAC Inverter Repair

    Apart from replacement you need to identify the main control device (IC) as the design of these inverters often follows the (very) basic operating principles as shown in that devices datasheet which are readily available and a good source for info on what to test/check.
  4. kellys_eye

    old car stereo LCD backlight

    The LED colour is 'set' during manufacture - the schematic shows the optional colour(s) and the resistors that must be fitted to make them work but there is no real opportunity to alter the colour unless you want to replace all the LEDs and change the fitted resistor values.
  5. kellys_eye

    12VDC to 230VAC Inverter Repair

    Make? Model? Schematic? For most small inverters it's often not worth the cost/effort to try to repair as replacements are so cheap these days. MOSFET failure is common and simply replacing them all can often fix the situation unless there are other issues with the circuitry but unless you...
  6. kellys_eye

    old car stereo LCD backlight

    You have to remove the LCD 'module' to access the back lights. They are standard (if not micro-miniature) filament lamps. Finding replacements won't be easy but the opportunity to change them to LEDs (a colour of your choosing too) has to make it worthwhile. IIRC such LCDs have the lamps...
  7. kellys_eye

    How to make tone and vol switches for Jazzmaster rhythm circuit

    The schematic shows the correct wiring and includes tonal control - just wire it accordingly. What you showed us in post #1 is still unclear in terms of how you've connected it to the pickups and output socket so we can't determine what else may be required to be added to fulfil your...
  8. kellys_eye

    Wireless momentary switch

    Wireless doorbell?
  9. kellys_eye

    How to make tone and vol switches for Jazzmaster rhythm circuit

    Just a picture of random wires and switches tells us nothing. Got a schematic?
  10. kellys_eye

    Inject dc into output side of laptop power supply?

    Unless you can determine what the actual 'id' signal is then we can't make a proper determination. That said, using the OEM charger shouldn't pose an issue as it's a very efficient device in its own right - potentially as good as, if not better than, the DC-DC converter you're trying to replace...
  11. kellys_eye

    Samsung 50-inch plasma Power Supply Board issue

    Remove the DC connector to the suspect board. Connect a resistor across the DC lead that causes a 'reasonable' current to be drawn (dunno - 10mA?, 50mA?) using the formula R (ohms) = volts/current. So if it was 100V and you wanted to load it to 50mA then R = 100/0.05 = 2000 ohms. Wattage...
  12. kellys_eye

    240VAC Power Output on Circuit Board

    If the power goes through the relay contacts then I suspect the relays are dud or the contacts therein are severely corroded/pitted.
  13. kellys_eye

    Replacing a 110v adapter on a cordless phone with a USB plug

    To talk to who? Another 'cordless' (of the same series)? If you want to make a phone call then use the local telephone. Your cordless set won't give you any functionality and certainly won't work with anything other than another handset of the same type/make.
  14. kellys_eye

    G8P-UA-006203 REPLACEMENT

    15V coil and 30A contacts? Dunno - what is the actual spec? If you can't get an identical replacement then soldering wires from the board to contacts on the next suitable alternative relay is the only way to go. The relay you were 'told' is compatible actually IS compatible so go back and...
  15. kellys_eye

    need guidance making a voltage regulator

    A buck-boost converter will take 'any' DC input and output a fixed DC voltage of your choosing regardless of whether the input voltage is higher or lower than the required output. Many buck-boost converters are rated in watts so at a 12V output and 'around 5 or 6 amps' you need a buck-boost...
  16. kellys_eye

    Samsung 50-inch plasma Power Supply Board issue

    The clicking is indicative of the protection circuitry kicking in and quite possibly as a result of a fault elsewhere in the set and not directly related to the PSU. That the fuse didn't re-blow is a good sign and firms up on the aforesaid. Remove off-board power 'out' connectors one at a...
  17. kellys_eye

    Voltage limiter 9V and above

    Show us what you did with the TL431 and IRF5305. Have you considered using a comparator?
  18. kellys_eye

    How to boost 2v - 4v, 50mA - 100mA to 5v 500mA?

    Possibly....... You want (5 x 0.5 = 2.5W) and you have (12 x 0.24 = 2.88W) so only a minimal overhead (0.33W) but if the stated efficiency as 97.5% (which I would take with a pinch of salt) you will JUST get away with it. In any design you really should have 'spare' capacity - your's is...
  19. kellys_eye

    Yaesu FT75 manual/schematic required

    GitHub - no. I'm only just (as of last night) familiar with Dropbox! https://www.dropbox.com/s/gydm0u3txu8sks9/FT75.pdf?dl=0
  20. kellys_eye

    I am deeply involved in making a cockpit for flying with MSFS 2020

    Delta Prime (or 'DP') has other meanings in today's world - but we don't need to know your personal habits.........
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