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  1. (*steve*)

    Need someone to check my circuit

    Oh, and your mains can kill you (and it will hurt the entire time you're dying). If you value your own life and that of others, get someone competent to work with you, or at the very least to check your work before you apply power.
  2. (*steve*)

    Need someone to check my circuit

    The power coming out of your pid? I assume you mean the low voltage control signals? Just use hookup wire as this is low current stuff. Btw the thickness of the wire is determined by the current (not the voltage). The thickness of the insulation is determined by the voltage.
  3. (*steve*)

    Need someone to check my circuit

    All mains wiring should be done with wire of a similar gauge (same or thicker) as that used in 10A rated cable. Use switches and cable rated at higher currents if practicable. If your power circuits are rated at 20A, then it would not be overkill to use 20A wiring (and heat sink for a 20A...
  4. (*steve*)

    Need someone to check my circuit

    I have SSRs switching 5A and they do not need a heat sink. However, at 10A I probably would. It also depends on the size of the SSR. A physically larger device has greater surface area to transfer heat to the ambient environment. The datasheet would give you all the information you need, but...
  5. (*steve*)

    Buck operation using IR2117 gate driver

    Why? At present that entire part of the circuit is floating. There is no way (aside from stray capacitance) of getting any energy in there. A buck topology requires the anode of the schottky diode and the capacitor to have a low impedance connection to the negative rail of the power source --...
  6. (*steve*)

    Buck operation using IR2117 gate driver

    Ground the anode of D1
  7. (*steve*)

    Hello, Welcome! (Introduce yourself)

    Hi Alex, welcome to Electronics Point.
  8. (*steve*)

    12VDC to 3.3VDC LED Metered after resistor

    Yeah we had a discussion a while back about this. I was of the opinion that there would be some minimum current to cause damage to the BE junction. After some experiments and some additional reading I changed my mind (and learned something in the process). In the case of the reverse biased BE...
  9. (*steve*)

    Course Choice

    Talk to the university about the elective units. Maybe you can do EE with power electronics electives or vice versa. Maybe you can do a double major.
  10. (*steve*)

    High current VR

    If you have transistors in parallel they need emitter resistors. That's just one error in that circuit, there must be others or Harald would have highlighted this :)
  11. (*steve*)

    For LEDs, is there a device that maintains a steady "power" output, interms of watts or amps?

    Here is the resource: https://www.electronicspoint.com/resources/got-a-question-about-driving-leds.5/
  12. (*steve*)

    12VDC to 3.3VDC LED Metered after resistor

    No, he was getting a low voltage across it. This is NOT indicative of it being reversed. What it I indicative of is that the gpio pin is an input with a weak pull up.
  13. (*steve*)

    Wives Say The Damnedest Things!

    I have heaps to add to this thread, but I am tasked with doing stuff for what I think has been described as charkra tuning energy crystals. Or something. I showed them to a colleague, asking him what he thought they were. After he replied "selenite" it was left to me to educate him about...
  14. (*steve*)

    12VDC to 3.3VDC LED Metered after resistor

    If the voltage across the led is 12v with it one way around and 0.45 the other way then it is likely that the gpio can't supply enough current. When it is connected the right way around, measure the voltage across the resistor and then across the LED. Chemelec is giving you bad advice. Ignore...
  15. (*steve*)

    For LEDs, is there a device that maintains a steady "power" output, interms of watts or amps?

    Yes, waaaay better. I suggest both you and the OP go and take a look at the LED resource we have.
  16. (*steve*)

    Course Choice

    Have you thought of doing one course or the other and doing electives from the course you didn't choose. Or investigate a double major. Your university is the best to advise you on your options. There is no perfect degree.
  17. (*steve*)

    Odd Stencil Soldering Problem

    Do it whatever way doesn't cause any of the solder to stay attached to the mask.
  18. (*steve*)

    Working With 240v And Arduino

    Ok, whatever you do needs to be "food safe", I.e. Use lead free solder or crimp connections that are anywhere near the mushrooms. Also don't use any other poisonous, irritating, corrosive, easily oxidized or corroded, etc. materials. An option is to use an aluminum heat sink with resistors or...
  19. (*steve*)

    Odd Stencil Soldering Problem

    I'll double down on Hop's comments. A good heating profile will fix a lot of your problems I guess. Having said that, if you managed to get the paste under the stencil or pulled some of it away with it, there is a point where you need to wipe it off and try again. Examining the board after...
  20. (*steve*)

    78L33 regulator

    Agreed. A series resistor on the supercap instead of on the input would possibly be a better option (but with few details it is hard to say) And thank the electronic gods that AC is not being applied direct to the regulator.
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