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  1. kellys_eye

    Need help finding new(old) capacitor or equivalent, please

    Yup, seems so - not a value you see very often and certainly not the usual 'E-series'. Still, if the hat fits......
  2. kellys_eye

    Need help finding new(old) capacitor or equivalent, please

    Electrolytic capacitors are very 'loose' with their values - typically +10 to -50% . 1600uF isn't a common value but 2200uF is and will probably work in its place. The only 'absolute' you need is that the working voltage is AT LEAST the 200V specified. Equally, high voltage, high value...
  3. kellys_eye

    how can i programme some apollo smoke detectors with xpert card (Kentec Electronics Ltd)

    The data sheet you link to shows the basic schematic of the power and data lines (both are the same) and it should be relatively simple to extract that data as required using the same 'bridge-and-transistor' interface as show. The datasheet also gives the basic data protocols used - that it's...
  4. kellys_eye

    how can i programme some apollo smoke detectors with xpert card (Kentec Electronics Ltd)

    What do you mean 'program'?? They are interlinked in order to activate all the devices in the case of just one detecting the fire. If you change that functionality they no longer do as they are intended and they are designed and sold for use in countries where the regulations INSIST that such...
  5. kellys_eye

    Marshall Micro Bass Amp - Electric shock???

    Have the equipment PAT tested. If the stuff is being used 'professionally' then it should be anyway. Even if it's just private (amateur) use then a PAT test will show up any potential for faults that could be risky to the user.
  6. kellys_eye

    Need help with SMPS voltage output high

    Pins 9 and 10 form a separate ground from the other supplies.
  7. kellys_eye

    Need Help Identifying HDMI pin outs from a VGA Convertor to HDMI Plug

    Pins and orientation in the post above (#4) are as viewing IN to the connector from the open end. Although I haven't checked, there is usually some marking denoting pin 1 - potentially numbers 1 and 19 embossed on the connector somewhere. Safest bet would be to use a made up cable and cut the...
  8. kellys_eye

    HP 1707B Horizontal deflection issue

    Lack of horizontal drive...... ok, it's 'obvious' but we'd need a schematic to give you somewhere to start looking.
  9. kellys_eye

    Need Help Identifying HDMI pin outs from a VGA Convertor to HDMI Plug

    Here's the pinout for HDMI - the signals on your PCB are marked slightly differently but can be decoded e.g. your PCB pin 1 is shown as D2P which corresponds to the HDMI signal TMDS data2 + (pin1 of the HDMI connector). Note the use of P for + and N for -. The 'numbers (0, 1 and 2) correspond...
  10. kellys_eye

    Transfering video using light

    https://www.amazon.com/GESD-Converter-Singlemode-Transmitter-Surveillance/dp/B088PDDV3G
  11. kellys_eye

    Pyle Pro PTA1400

    The amplifier clearly has two identical channels (modules) so you could compare voltages on each side to see where there are specific differences. The large 'bang' does, however, point to intermittency in the speaker outputs. Whether this is as a result of a dry joint on the board that holds...
  12. kellys_eye

    Recommendations for a timer switch 12V boat pump

    Really? Most simple bilge pumps chuck the water out at 500 to 1000 gallons per hour (2-4000 litres/hour) equivalent to a minimum of 0.5litres/second. Assuming a 20 litre 'flood' it will take 40 seconds i.e. under a minute and at a current draw of typically 2-3A. Assuming worse case (3A) this...
  13. kellys_eye

    Are There 3 Volt MultiMeters?

    You'll get limited capability with a 3V meter but if all you want to measure is VI and R then go for it. My meter (9V) also does capacitance, semiconductors (inc LEDs), frequency etc.
  14. kellys_eye

    Installing reverse switch, wires get hot from power source

    What switch did you use and how did you wire it? Which model saw is it?
  15. kellys_eye

    APEX JR. subwoofer amp blowing fuses, bad caps found

    Looks like the transformer had a short (in the primary) - initially - that caused the fuse to blow but the reapplication of power through another fuse has 'blown' the short apart which has left it open circuit. Fuse no longer blows but transformer has zero output. It's quite a rare occurrence...
  16. kellys_eye

    Pyle Pro PTA1400

    We can only offer guesses here. Lacking a schematic makes it hard - lacking pictures doesn't help either.....
  17. kellys_eye

    Bias_T and inductor resistance

    Tweezer types are available - Elektor magazine are doing an offer on a multi-purpose tweezer measurement device...
  18. kellys_eye

    Installing reverse switch, wires get hot from power source

    What size wire are you using? Sounds like you need to use a heavier gauge.
  19. kellys_eye

    ccfl lcd laptop repair help, pics attached

    The display driver chips are often mounted on the actual ribbon cables that are 'welded' to the edge of the LCD screen itself - these are the horizontal and vertical connections that allows access to each element of the display. Over time these connections can 'come away' from the glass and...
  20. kellys_eye

    Bias_T and inductor resistance

    Here's one I swear by...
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