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  1. kellys_eye

    What is industrial cable gland?

    I'll take 'prelude to spam' for 1000 dollars
  2. kellys_eye

    Build pwerbank ?

    Buy a portable tool charger with appropriate battery. The charger operates from local AC mains input and batteries of various capacities can be obtained to plug'n'play, charging within a couple of hours (often less time than that). I recently purchased a small charger from a local supermarket...
  3. kellys_eye

    Rotel RA820A stereo amp no right channel

    I should have asked for 'all' the voltages around Q618. Point 'E' is correct for the test meter though. What's the base voltage at Q618 and, further 'back' in the circuit, the voltages around Q614?
  4. kellys_eye

    Rotel RA820A stereo amp no right channel

    Put Q618 back in circuit then power up and measure the voltage at Q618 emitter. Where are you putting your test meter negative lead when measuring those voltages?
  5. kellys_eye

    TPIC1356 datasheet or pinout info

    I did read your post - my response was simply a comment, not an instruction. For most steppers the current will be limited by the coil resistance and devices as small as your stepper won't suffer. Do you have any technical spec on the stepper motor itself?
  6. kellys_eye

    AC Power Adaptor Pinout // Adapt to battery power

    Provided you keep within the voltage rating and the PSU can deliver AT LEAST the required current (you can have a higher current supply, the equipment will only take what it needs, no more) you won't fry anything.
  7. kellys_eye

    AC Power Adaptor Pinout // Adapt to battery power

    Probably not. The PSU will be 'over-rated' for safety reasons and potentially rated at what it is only because they used it from another device rather than designing one from scratch. For example - my laptop PC power pack is rated at 65W but the laptop itself needs far less to work. Measure...
  8. kellys_eye

    Air conditioner remote control

    What is the type of remote. Is it IR, or wireless? Equally, can you find the protocol codes for that remote? Will the AC power up from a previously set state?
  9. kellys_eye

    TPIC1356 datasheet or pinout info

    This is where dedicated step driver devices come into their own as they offer the motor current monitoring facility and give much better protection. You can use Google translate to copy the lines of 'simple Chinese' into their translator and see the relevant pin descriptions/operation.
  10. kellys_eye

    Suggestion on where to ask for help in designing a simple RPM/rotation checking device?

    I'd go with the 'missing pulse detector' (MPD) version and then decide which method of pulse detection you want to use. Naturally this solution will involve building (or having commissioned) the construction of the MPD and the experimentation with the signal detection circuitry so, as far as...
  11. kellys_eye

    Suggestion on where to ask for help in designing a simple RPM/rotation checking device?

    Here's a slotted opto module that'll deliver a pulse stream if you can fit an 'interrupter' on the motor...
  12. kellys_eye

    Suggestion on where to ask for help in designing a simple RPM/rotation checking device?

    'Fast' is the relay solution. I don't know (off-hand) of an off-the-shelf IR/rotary solution but Google 'missing pulse detector' schematic. This is (basically) a retriggerable monostable used to hold a relay (switch) contact closed until it detects a missing pulse for whatever detection...
  13. kellys_eye

    Suggestion on where to ask for help in designing a simple RPM/rotation checking device?

    You can get current monitoring relays with programmable delays that will trip if the set current is exceeded for any given time period. This might be a better option: https://uk.rs-online.com/web/p/monitoring-relays/8505392?gb=s Use the relay contacts to either stop the motor and/or sound an...
  14. kellys_eye

    PROMAX AE-566

    Nothing wrong with getting a second opinion. At my age it's almost a mandatory requirement as the mind ages. We always appreciate follow-ups and your results, good or bad, may help others somewhere down the line.
  15. kellys_eye

    Computer PSU Repair

    They would be the primary switching devices and the OP wouldn't measure diddly squat on any output if they were dud!
  16. kellys_eye

    Equivalent~ish Mosfets for Power Inverter

    No problem with that - any 'overhead' is better than none (or not enough). But see the post above re the Rds(on) values which you can get from the datasheets or the parametric search results on most supplier sites. Lower is better.
  17. kellys_eye

    Equivalent~ish Mosfets for Power Inverter

    'Uprated' MOSFETS would include such improvements as lower Rds(on) values and, as such, they would dissipate less heat anyway.
  18. kellys_eye

    PROMAX AE-566

    This is where you confuse me. The wattage will always ADD regardless of whether the resistors are in series or parallel so it's a 14W resistor no matter how they are connected. Given the correct resistance (wired in series) is 54 ohms and the load is 400mA on a 24V line then that wattage (0.4...
  19. kellys_eye

    PROMAX AE-566

    I read the schematic values as being the totals. I doubt EXACT values are required given the tolerance of the VOLTAGE readings would likely be acceptable if you take 5% for the lower voltages and 10% as the higher voltages as figures to use. The tolerance measurement ranges given/suggested is...
  20. kellys_eye

    Equivalent~ish Mosfets for Power Inverter

    You can fit MOSFETS with higher ratings but that doesn't necessarily mean you can get more power out from the inverter. There will be feedback measurements that limit the output as part of the regulation circuitry.
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