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  1. kellys_eye

    Replacement for .5 MFD / 300 VDC Capacitor

    0.47μF is the nearest standard value and obtainable in a full range of voltages. Anything that meets or exceeds the voltage requirement will suffice.
  2. kellys_eye

    Comedy Thread

    We gave the rabbit away when we left the area - some 18 years ago now. It could be rather tough meat if it is still alive!
  3. kellys_eye

    Brother P-Touch Labeller not powering up

    The USB port is likely to be totally independent of the power input socket and feed to the main board but you can easily check this by looking at the pcb traces under the wires going to it.
  4. kellys_eye

    capacitor testing for novice please

    You need what is called an ESR meter. The Chinese sell a multi-function semi-conductor tester (ostensibly) that also has an ESR function and can be purchased for around £10 - delivered. But if you are testing for the purpose of re-using then unless you have a specific requirement to re-use...
  5. kellys_eye

    Where to get a WR05 to WR03 tapered transition?

    If you've got or can afford equipment to reach those frequencies then you'd already know. Like the old adage "if you have to ask, you can't afford it".
  6. kellys_eye

    Comedy Thread

    When I was living with my gf (now wife) she had a house rabbit (Dylan - coz it kept eating her pot...) that could 'sniff out' power wires. I had one of those dual graphics card PC's that used an external plug/connector to parallel them and the frikken rabbit chewed through them all! Cost me a...
  7. kellys_eye

    Hello from London

    Last time I looked he was 6ft under......
  8. kellys_eye

    Help Needed: Vizio Power Supply Board

    Check also for 'repair kits'. Many power supply boards have known, repeatable, faults such that some suppliers sell kits of bits that cover all the usual suspect parts. If you can find a kit just fit all the parts that the kit supplies - replacing all the potentially dud components - and you...
  9. kellys_eye

    Frankensteining two welders together

    It's quite common to drive the wire feed motor using a simple triac circuit - often driven by the ubiquitous 555 timer device (IC) but sometimes the pulses are generated using a quad pack op-amp/comparator like the LM324. If you're driving a larger wire feed motor the supply CURRENT has to be...
  10. kellys_eye

    Frankensteining two welders together

    Nope - that's a relay. A wider view of the board would help - better still a full schematic.
  11. kellys_eye

    circuit breaker switched off from distance ?

    The technical name for a device that can switch a breaker off from a distance is 'stick' - or 'long stick' if the distance is large.
  12. kellys_eye

    losing voltage when testing with meter

    Which pins?
  13. kellys_eye

    Frankensteining two welders together

    Pictures? Schematics? Your description makes no sense without them.
  14. kellys_eye

    Newbie; 3 phase, 460V, 12 wire motor; what if wrong hook up?

    Short L1 and L2 and blow the breaker - clearly wrong.
  15. kellys_eye

    Clocking an 8049 Microcontroller with Ceramic Resonator

    Look at the data sheet for the CPU - it shows the xtal pins as being driven by an inverter (crystal connected from input to output).
  16. kellys_eye

    Help Needed: Vizio Power Supply Board

    Yeah, my bad. I made a spot decision on the unit being a Surround Sound device. Had I realised it was a TV I'd have been more circumspect. Will do more 'Googliing' next time....:oops:
  17. kellys_eye

    Help Needed: Vizio Power Supply Board

    Do you know the rated output of the power rails? If so then any suitably rated PSU or combination of PSUs will work.
  18. kellys_eye

    Clocking an 8049 Microcontroller with Ceramic Resonator

    Yes. Common ground of course. If your scope only shows a 4Mhz signal as a fuzz you have no chance of seeing the signal at 6Mhz.. you could make a simple diode probe and measure the DC to prove an alternating signal. Two fast diodes and a capacitor is all that's needed.
  19. kellys_eye

    Microwave Oven technology

    We used a Panasonic microwave for about 8 years with zero issues other than the door hinge breaking - which is why we dumped it. The electronics (power inverter) worked flawlessly. I'd buy another and even recommend them to other people.
  20. kellys_eye

    Clocking an 8049 Microcontroller with Ceramic Resonator

    You can clock it directly through Xtal1 i.e. pin 2. Is your 'scope set up correctly to view the signal? Try a different resonator or genuine crystal (any frequency but with due regard to the capacitance required). The 2V 'DC' signal seems to indicate resonance is happening.....
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