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  1. kellys_eye

    Integrated Circuits

    In 25 years (pure guess work) you'll be looking back at those 'billions of transistors on a fingernail' and saying 'antique....'.
  2. kellys_eye

    Blue tooth 4.0 usb 2.0 csr 4.0 dongle adapter for pc laptop win xp vista 7,8,10

    If the BT speaker has the same protocol then there's no reason why the device wouldn't work.
  3. kellys_eye

    Crystal 16000.0

    There's no 'usual' requirement for 16kHz in modern electronics but 16MHz is a common processor clock frequency. Unless the OP has some specific reason for declaring the crystal faulty I think it is unlikely to be the cause of any fault as they are, generally, very reliable. What other tests...
  4. kellys_eye

    Like new treadmill has dead console. Was working until I unhooked it for transport

    Use your meter on it's continuity setting (the 'beeper') and measure across the two terminals. If it 'beeps' then the switch is 'set' and is working fine.
  5. kellys_eye

    Like new treadmill has dead console. Was working until I unhooked it for transport

    ?XD will be TXD and RXD (Transmit Data and Receive Data) respectively - meaning the board 'talks' to some other part of the device. The 'none tactile' reset switch is normal. It would 'click' if it had tripped out and you pressed it to reset it. 1. Check all fuses 2. Measure all supplies...
  6. kellys_eye

    Help me help myself. I need a good troubleshooting course 101

    Knowing how to fix something first means knowing how they work. You need to be able to 'break down' the device (whatever it is) into relevant sections (that may be repairable) that themselves could be further broken down to isolate a fault. Having a service manual would be an almost essential...
  7. kellys_eye

    Like new treadmill has dead console. Was working until I unhooked it for transport

    Is there anything connected to J14? Is the flat ribbon cable (bottom left corner in lower pic) seated straight? Looks a bit skew-iff to me.
  8. kellys_eye

    PBC - Bosch Dishwasher SPI50E05EU/07

    Get the data sheet for the controller device (TNY...) and look for an applications schematic - often shown on the data sheet itself - which will reveal what that capacitor value (or its range) usually is. You would have to look at the reverse of the board to see which pins of the IC it is...
  9. kellys_eye

    100V motor on a pump?

    Sounds like a pump made for the Japanese market......
  10. kellys_eye

    Need help on this device Dc 5v 4-phase 5 wire stepper motor board + remote control

    Your supply to the board is correct but the stepper uses a separate supply input (motor power + and motor power -) and must also receive power - this can be a different supply than that of the +5V power to the board itself as many steppers operate at a voltage that is higher (up to 30V for...
  11. kellys_eye

    Stuck detecting 'engine running' from alternator 'W' signal

    How about detecting the field current in the alternator armature (via the ignition lamp) i.e. when the ignition light is out a relay switches power to the hours-run meter. Obviously the power for the detection/meter should be via the ignition switch.
  12. kellys_eye

    Need help on this device Dc 5v 4-phase 5 wire stepper motor board + remote control

    Hence my comment on the quality of the photo. If we could SEE the board we could figure out which connections are for power.
  13. kellys_eye

    Need help on this device Dc 5v 4-phase 5 wire stepper motor board + remote control

    How not to take photos.......:rolleyes: Anyway, where is the power connection? If we could 'see' the board we might be able to assist.
  14. kellys_eye

    Black Horizontal Lines in bottom of desktop lcd Screen

    Bought it new? Send it back as faulty. Bought it second hand? Ask for a refund. Stuck with it? Try applying pressure (lightly) at the edge of the display where the bars are (left hand side of the panel probably but it could be the right hand side). This sometimes affects a cure although it...
  15. kellys_eye

    Quiz Time

    Ha.... reckon I've sussed it. I was fooled by the use of supply lines to the device until I realised that some opto devices have buffer/inverter/amplifiers in place of the actual opto-transistor. Under those circumstances the outputs are actually open-collector (hence the 2k2Ω pull-up...
  16. kellys_eye

    Battery pack diy advice please

    Why? It may destroy the circuitry.
  17. kellys_eye

    Quiz Time

    Here's something that's puzzling me and I'm hoping for some feedback from members that can help. I have an unknown device (marked as 630 341, it's an SOIC format but about 4mm high) that is configured as shown below. I've assumed the input and output status (it may be reversed but I think it's...
  18. kellys_eye

    Just an idea - maybe it already exists?

    Found a site called Octopart that has a parametric search facility that covers a LOT of component parts and includes such search options as 'pin numbers' etc. Worth a look: https://octopart.com/electronic-parts/integrated-circuits-ics The above link deals with IC's but at their main page you...
  19. kellys_eye

    Soldering FMC connector

    Hotplate? I've heard of people using a simple clothes iron (upside down) to do things like this. A reflow oven is what you really need. You can make a simple one from store-bought table top ovens but you might get lucky and find someone who'll do the job for you. Are you using sufficient...
  20. kellys_eye

    Chinese synthesizer problem

    Is it a monophonic or polyphonic device? Pictures? Make? Model?
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