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  1. kellys_eye

    Rpm Problem turntable Sony PS 333 direct drive

    Could be a simple break in the circuitry around the actual speed control itself. A full technical manual is available for download https://elektrotanya.com/sony_ps-333_turntable.pdf/download.html which gives all the details necessary to take the unit apart. Page 10 shows the small PCB carrier...
  2. kellys_eye

    Proper switches circuit breakers & fuses for a 60VDC system

    No forum likes cross-posting on the same issue. Either seek and get your advice from one of them or cease asking. You're setting (or trying to set) one forum against another when the advice (as I read the comments) seems to be identical across all of them. I note that someone reverse...
  3. kellys_eye

    Need Light Sensor for Making Circuit to Turn On Or Off

    To do it with two wires and in a small package you need to remotely mount the actual sensor from the controlling electronics. There are many light-sensitive switching modules that are available and extending the wire connections to the light-sensitve part of it (be it a phototransistor or a...
  4. kellys_eye

    New components tests, vs Old components tests

    Not a good place to purchase parts if you intend using them anywhere near their rated maximum. The incident of 'fakery' when it comes to specifications of such devices is quite high - anecdotally. Getting the parts from a reputable supplier (Jameco for example) is far better - you will, at...
  5. kellys_eye

    Speaker power (wattage) and consumption

    Where did you get those specifications from? Post a link. Various manufacturers use various methods to state speaker power - most such methods result in a vast over statement of their capabilities which really should be stated as continuous RMS. The figures you give 'may' refer to 100W RMS...
  6. kellys_eye

    My brand new oscilloscope

    Classic stuff! I've had a few of those in my time - sold them on as my needs changed.
  7. kellys_eye

    Blocking DC voltage on an AC circuit

    As above - how are you measuring 'DC'? Is the triac not conducting on one half cycle? This is what you'd measure (i.e. a DC component) if the dimmer used THYRISTORS rather than triacs. Sure you've not got the wrong type?
  8. kellys_eye

    Led resistor types

    Do the calculations - this will give you the power rating for the resistors you use and you can select the correct one from that. It doesn't matter what 'type' of resistor you use in this type of application although the physical size might make you lean one way or another.
  9. kellys_eye

    common mode choke

    Is that a picture of the choke in its 'repaired' state? If so I see nothing wrong with it at all and looks safe to be reused as-is.
  10. kellys_eye

    common mode choke

    The common mode choke is made to carry the operating current (and then some) so have you checked WHY it's become open-circuit? They don't do so for no reason! The device is used to prevent EMF (interference) and the equipment will work without it if you have to (bypass it completely) although...
  11. kellys_eye

    Proper switches circuit breakers & fuses for a 60VDC system

    If the control switches are really only operating 'functions' and not controlling the main power feed (in or out) directly then they can be 'any' switch that provides the required function. Only the 'power' and 'motor' cables carry high currents. Use an isolator switch and a fuse for the power...
  12. kellys_eye

    Rewiring Power supply. Noob question

    You can take the full 5V output at 18A (90W) + whatever wattage (at 12V) is 'left over' (and from 270W - the derated maximum at 50oC this is another 180W) which would be 12V @15A. I'd think that 5V @ 18A and 12V @ 15A would be more than enough to power any HDDs you fit!
  13. kellys_eye

    common mode choke

    Short answer - probably. Long answer - show us the schematic or tell us the make/model of the amplifier.
  14. kellys_eye

    Identify blown IC without circuit diagram

    That device is indeed a high side SMPS controller with its own MOSFET switching transistor in an 8-pin DIP package. You could use the parametric search facilities at a component supplier site (like Digikey) and search using those factors to get the list down to a 'few' potential replacements...
  15. kellys_eye

    Rewiring Power supply. Noob question

    5V @ 18A = 90watts 12V @ 10A and 16A = 120watts plus 196watts = 316watts. Total is 406 watts - lots of those PC power units state the MAXIMUM TOTAL power they can supply which is different from the volts (times) amps totals they also list! e.g if the power supply is rated at 350 watts you can't...
  16. kellys_eye

    Hi all, from a different tradesperson.

    Absolutely. The modern trend is for LED lighting anyway and all sorts of bulb types, shapes, colours etc are available that operate at LOW VOLTS and can be powered using 'already certified' power supplies. The added safety of ELV (extra low voltage) means you avoid a plethora of legislation...
  17. kellys_eye

    Rewiring Power supply. Noob question

    I wouldn't trust a 'single core' of the wiring to the molex connectors to be good for anything more than 5A. This is why they 'double up' on the numbers of wires. For a PSU with a rated 5V output of 50A (for example) then TEN wires isn't unreasonable.... Look at any PC power pack and the...
  18. kellys_eye

    UK specific laws regarding the sale of self made electrical goods?

    You'd need Public Liability Insurance to do this anyway and good luck finding a company willing to give you that on the basis of what you're doing......
  19. kellys_eye

    How to use up hi voltage power

    Start by STOPPING. No one - amateurs in particular - should NOT be considering such a project. This is a one way ticket to the mortuary. What on earth would you want to do this FOR?
  20. kellys_eye

    Rewiring Power supply. Noob question

    4 x 420mA = 1680mA (1.68A) plus 2 x 720mA - 1440mA (1.44A) = total 3.12A @5V 4 x 700mA = 2800mA (2.8A) plus 2 x 520mA = 1040mA (1.04A) = total 3.84A @12vdc So under 5A total for each supply - seems ok to me using the wiring you have connected.
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