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  1. kellys_eye

    Hour meter for laser cutter

    Nice, clear, smart and simple board layout. What software did you use to do it? I'm looking for easy-layout pcb software that doesn't require you to first make a schematic, BOM, rats nest etc - just a simple click from A-B to drag the track and a library of pads! LOL, Mrs k_e is missing a few...
  2. kellys_eye

    300 V DC Power Supply

    I have the schematic of a DC-DC boost converter that connects to your bog-standard lab PSU and allows the variation of 0-30V from the lab supply to become 0-300V for 'other purposes'. This facility allows you to use the over-current protection of the lab supply for safety purposes.
  3. kellys_eye

    300 V DC Power Supply

    Regulated?
  4. kellys_eye

    Can someone help me ID 2 components pleased?

    Potentially the inductance - not sure whether it's 100μH (most likely) or 1000μH (not big enough). Either way you would need to find something to match the footprint so browse the search results and compare....
  5. kellys_eye

    Need help locating Schematics

    Is the NEC VT580 any way comparable to the VT540? It may be that there are enough similarities that makes this download useful: https://www.manualslib.com/manual/829487/Nec-Vt440.html#manual
  6. kellys_eye

    Can someone help me ID 2 components pleased?

    No, that looks ok..... I've searched Digikey and Mouser for your inductor but not found a matching one. You can try yourself using 'SMD common mode filter' as the search word. As mentioned, the filter is potentially redundant (fitted to meet EMC standards but unlikely to cause any issues if...
  7. kellys_eye

    Can someone help me ID 2 components pleased?

    Can I see a close up of the 8-pin device labelled VR1? It looks as if there may be some damage there...... Either way, in the latest picture, there are two tracks going 'vertically' from the power socket to L1. These go 'in' on one side of L1 and exit directly opposite so you could remove L1...
  8. kellys_eye

    Light buttons for driving simulator

    You would need a USB interface for the buttons and a separate power supply for the switch illumination. http://www.leobodnar.com/shop/index.php?main_page=index&cPath=94 links to a seller that has various interface boards that accept multiple switch inputs and encodes then to USB and appear in...
  9. kellys_eye

    Can someone help me ID 2 components pleased?

    That inductor looks like a common mode choke (4 terminal) rather than a simple inductor (2 terminal) or perhaps an impedance matching transformer. It won't be easy to identify or replace unless you have access to the schematic. What make/model of equipment is it? Is the connector beside it...
  10. kellys_eye

    Light buttons for driving simulator

    Nearly all major electronics suppliers carry stuff like that. Ebay is particularly good for 'cheap' rocker switches with illumination. Here's an example of illuminated switch with the actual legends required for cars...
  11. kellys_eye

    Cable size?

    Cable sizing is actually quite interesting (for the geeks in us, anyway!). They are actually rated by temperature. Many PVC insulated cables are rated at 70degC (for example) so you can load it up as much as you like up to the temperature reaching said level. Accordingly, the current handling...
  12. kellys_eye

    Bit of quiz fun

    Well we've had THREE MONTHS to finish that one - time for another. Let's see if we can do a bit better!
  13. kellys_eye

    Stepper Motor Enable line

    No. If you don't want to use the enable pin you can either wire it directly to the appropriate logic level to 'fix' it status OR if you want the enable pin to function 'properly' you could fix the output of a monostable to the enable pin. The (retriggerable) monostable input would be from the...
  14. kellys_eye

    4n25/35 optocoupler detect led on/off

    WHERE on the module?
  15. kellys_eye

    PCB for dimmable LED

    Simple thyristor (black, three-leaded thing) 'chopper' circuit using a DIAC (the small blue glass leaded thing). There are many references to its operation such as this one: https://thinkelectronics.org/light-dimmer-using-triac-diac/ It's not a standard pcb - pcbs are designed to suit...
  16. kellys_eye

    Bit of quiz fun

    No PM received but a 'checksum' (total the individual completed numbers in the grey boxes) will give a right/wrong answer if you want to let us know.
  17. kellys_eye

    Bit of quiz fun

    Croykee Mick.... it took me FOUR attempts to get the solution! When I make a mistake I find it impossible to roll-back my numbers to establish where it went wrong so inevitably have to start from scratch! Still, I finished it today!!! And the checksum of 20 fits my answer too. Congrats on a...
  18. kellys_eye

    Stepper Motor Enable line

    The enable line is used to switch the motor drive outputs on/off and if the chip is 'disabled' you won't have any coil current i.e holding torque - if that's an issue for you. If not then tie it high/low accordingly. If power consumption is not a real issue you could use a retriggerable...
  19. kellys_eye

    Hour meter for laser cutter

    The idea for an hours-meter on the laser is great.
  20. kellys_eye

    Determining LED values

    50Ω/volt should do.... (rule of thumb for more accuracy if it's an issue) 250Ω (nearest E12 being 220Ω) @ 5V 600Ω (nearest E12 being 560Ω) @ 12vdc 1200Ω (spot on E12) @ 24V
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