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  1. (*steve*)

    Need help finding replacement transformer for oven control board

    They're probably very useful, it's just that the information it links to is not publicly available.
  2. (*steve*)

    Need help finding replacement transformer for oven control board

    You have a couple of options: Find the manufacturer and get a replacement. Find a replacement board or transformer from a junked unit Find the specs of the transformer and try to find a replacement Fix the transformer. reverse engineer the specs 1 & 2 are probably the easiest fix, but may not...
  3. (*steve*)

    Variac VA

    It appears to have a much heavier gauge wire than mine. Mine is more like this.
  4. (*steve*)

    Variac VA

    Here is a picture of mine. It's about 70mm tall, and 120mm diameter. And here's the front panel. (Not that I think it's useful)
  5. (*steve*)

    Super bright led light

    Strap a grandfather clock to one of them. (There may be smaller options) I'd probably look for something that flashes. There change in intensity will make it more visible.
  6. (*steve*)

    Variac VA

    That seems quite small. Yeah the weight might help. I have a 750VA variac and that is about the same dimensions. If I have time I'll open the box and measure the dimensions
  7. (*steve*)

    Piezo Control voltage source

    To zener in series, either anode to anode or cathode to cathode.
  8. (*steve*)

    Piezo Control voltage source

    Sorry, I read those as a Schottky diode symbol. Your original is fine if you use normal diodes (Schottky are better) Audioguru's method will also work, but a pair of back to back zeners will do the job without needing the additional diodes.
  9. (*steve*)

    Piezo Control voltage source

    It may be worth placing RS/2 on either side of the junction of the diodes. It's not strictly necessary, but it does provide significantly more protection. Don't make RS too high or you'll end up with a low pass filter formed by RS and the junction capacitance of D1 and D2.
  10. (*steve*)

    Hour meter for laser cutter

    Here is one of the boards. It got slightly overetched, and you'll note that the board looks a bit twisted(?). The cooling air moved the PCB as the pattern was being applied.
  11. (*steve*)

    Hour meter for laser cutter

    Here is the updated schematic
  12. (*steve*)

    Hi i need help with unlock code for fujitsu ten AVN550HD car radio i just bought a month ago

    Take it back to where you bought it
  13. (*steve*)

    Hour meter for laser cutter

    It's a 1M resistor. Well spotted. I posted the wrong schematic. I'll post the correct (and slightly better formatted) one later. Surprisingly bright, and very easily seen in the indoor lot environment (in testing it was ok a well lit electronics bench). As I think I mentioned earlier...
  14. (*steve*)

    Hour meter for laser cutter

    And here is the PCB layout. Blue is copper (top side) and red is silk screen (top side). The silk screen layer is unused except as documentation. Oh yeah, you'll note I have a 4.7uF 0805 cap specified here for the output of the regulator. I ended up using the 0.33uF, the current draw is...
  15. (*steve*)

    9volt battery

    Run it from 6 D cells.
  16. (*steve*)

    For Sale: Osciliscope, Power Supply and Function Generator SOUTH AFRICA

    I think the idea is to post images here so people can see what your selling.
  17. (*steve*)

    300 V DC Power Supply

    The safest way is to use a small boost converter. What are you using the 300v for? How much current is required?
  18. (*steve*)

    Can someone help me ID 2 components pleased?

    It's not impossible for that to be a 1000uH common mode inductor. Given that the core only sees the difference in currents, it does not have to be large. The main issue is the number of turns you can fit of a gauge wire that can handle the current. However I would agree that replacing it with...
  19. (*steve*)

    Hour meter for laser cutter

    And for amusement value, the schematic that was drawn on the whiteboard, which was the schematic I used when creating the PCB design! The final circuit shown above wasn't drawn until after the PCB has been made and the circuit tested :) The partial circuit below it was an initial option...
  20. (*steve*)

    Determining LED values

    Sorry about that. I read something completely different to what you wrote. I'll go back and edit my post.
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