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  1. kellys_eye

    Where to find data about LED 155BRP made by AND?

    It's not an easy company to search for is it? Every time I try to use 'AND' it is interpreted as the word 'and' - spacing it out doesn't help, nor does including hyphens, apostrophes or inverted commas or dots! Funny thing is that I know (knew) of a company called AND Electronics - based in...
  2. kellys_eye

    Normal resistors for High Voltage application

    There's been a lot said about 'resistors' in just this thread. Who'd'a'known that resistors were so...... err, complicated?
  3. kellys_eye

    Wiring on Pedal Assist Bike

    Looks like a simple slotted opto arrangement with quadrature output signal. There will be positive and negative supplies (which can be measured with a meter) which can be anywhere from 5V to 12V (potentially up to 15V) and the 'signal' which is 'irrelevant' for the moment. What you need to do...
  4. kellys_eye

    Normal resistors for High Voltage application

    High voltages usually also means low current (μA) and resistance values in the MΩ range so you'll be using series resistors anyway to reach those values.
  5. kellys_eye

    Spike Generation

    Your difficulties may be as a result of a design issue so if you're not prepared to share the details then we've gone as far as we can with our assistance. You're on your own from here!
  6. kellys_eye

    Where to find data about LED 155BRP made by AND?

    You must have a very specific use for them if you need such accurate data! You can measure Vf easily enough and the operating current could be guessed at 20mA ??? If it lights up and is visible at the angles you need then...... Or am I missing something?
  7. kellys_eye

    Normal resistors for High Voltage application

    Resistors have a maximum voltages rating. If using them beyond the recommended limits it is common to make the total value from a chain of series resistors such that the voltage across any one of them does not exceed that maximum for the individual. Attention to board placement/ track layout...
  8. kellys_eye

    Beeping from disconnected system

    What 'system'?
  9. kellys_eye

    Static Transfer Switch preinstalled in UPS?

    That's what the 'U' in UPS means - uninterruptible..... Check the device specification for switching times and pick the lowest! Electrically, this is called a make-before-break function but requires synchronisation of the two sources but, for most applications, this wouldn't be an issue.
  10. kellys_eye

    Yamaha psr s710 - No Sound no led lights from buttons.

    Supply voltages are ok when within 5 or 10% of the stated values - they don't have to be spot-on! Resistance checks are not reliable when measuring in-circuit. You would normally have to remove the components to get a true reading. The capacitor is ok. Another potential fault could be a...
  11. kellys_eye

    How to circuit a motion sensor to drive 30 amp relay

    You can get motion sensing switches to control room lighting quite readily and using one to switch a solid state relay to handle the stove current is straight forward.
  12. kellys_eye

    Logitech x-540 repair

    Well the OP was asked to upload pictures and expand on the issue but failed to do so. If you started your own thread on the subject and did what the OP 'should' have done we might be better placed to assist you in fixing YOUR problem..... or we could wait for the OP to reply!
  13. kellys_eye

    Yamaha psr s710 - No Sound no led lights from buttons.

    How do you know it's 'dead'? It's a 100pF device. Not easy to test (although a dead short would be very apparent) and you'd normally have to check it 'out-of-circuit'. If you are testing components at random then good luck - you may eventually stumble across a defective one.... but there's an...
  14. kellys_eye

    Spike Generation

    Do you have the correct supply decoupling components situated around the circuit? i.e 100nF at each IC power pin, 10μF and/or 100μF across the supply lines? Show your schematic.
  15. kellys_eye

    Green laser

    The more function you want from a laser the more you have to pay. As per @Nanren888 most cheap 'pen type' lasers already available have spot diameters in the millimeter range and would suffice for aiming at a dartboard with no problems at all. Your ability to aim it will depend on the range as...
  16. kellys_eye

    Logitech x-540 repair

    The OP last posted 4 years ago and hasn't been back since - I very much doubt you'll be hearing from them.
  17. kellys_eye

    Yamaha psr s710 - No Sound no led lights from buttons.

    Top left corner of the block diagram (page 153) is the EIF board. This interfaces the LEDs via the E-Bus1 signal(s) which look to be based on the I2C data bus. Check the supplies to and at this board (looking for 5V and 3.3V) first - if the supplies are ok you'll need to check the data to/from...
  18. kellys_eye

    Quint Power Supply short

    A wider view of the board would help too.
  19. kellys_eye

    Quint Power Supply short

    Welcome to the forum. Take it apart! You have a short on the mains input side which usually means the main switching component (a transistor or a MOSFET) has gone short. You may also have a short in the main bridge rectifier. We really can't tell from a picture of the box! We may also...
  20. kellys_eye

    Electrolytic Capacitors With Higher Stamped Value

    As long as the tape heads may last, it doesn't follow that they are correctly aligned. A simple azimuth screw adjustment (left then right) will reveal whether or not the heads are 'out' as the higher frequency content will be very clearly heard as an improvement. The suggestion that the...
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