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  1. Delta Prime

    AC generation

    What electronic magazine did this come from? What year? :) What month?
  2. Delta Prime

    USB-C -> barrel connector

    In the link you posted there's bi-directional hand shaking going on, a true type C charger recognizes the connected device and negotiates the required power to charge it as quickly as possible. This negotiation is done Via data lines and ensures a quick charge without delivering too much power...
  3. Delta Prime

    CDI trigger circuit parts

    CDI "Capacitor Discharge Ignition" Self-explanatory. You must research your particular engines ignition system. If you wish to alter the speed limiter which is kind of like a modern day governor of a vehicle, you need to reprogram the ECM/ECU microcontroller in the vehicle this is done...
  4. Delta Prime

    Philips Pm3585 logic analyser, EPROM dump.

    As a kid I used to play archaeologist and dig up eproms along with 741 opamps, did you point a thousand watt light bulb at it? you can leave eproms out in the sun all day without degrading the stored charge in eproms plus the Quartz window did have what amounts to a diffuser reducing the light...
  5. Delta Prime

    Outdoor string lights keep faulting

    I would be happy to tell you exactly what will happen if you went back to your buck converter supply... Make,model, link, of your buck converter please. You see where this is going... I cannot give you proper advice without the necessary information. I will not critique your test method. Perhaps...
  6. Delta Prime

    Comedy Thread

    I got a beef about that joke! It's not easy being cheesy. But you have achieved it. PU someone open up a window please.... That joke stinks. Q: Why are electronics engineers bad at cooking? A: They use too much SPICE. :p
  7. Delta Prime

    Power Amp Repair Help - Fuses keeps blowing

    Talk is cheap. so is that method. But effective. Oh look at that! there's a switch mode power supply there on the input wow! Let that be a lesson to you. Just put your amplifier there....same difference. It says 150watt but 60Watt will work.
  8. Delta Prime

    Outdoor string lights keep faulting

    Yes they can fail short circuit and they can fail open circuit. Before they fail they can be intermittent. Yes if your multimeter has a diode test setting use that, when you forward bias the LED it should light up faintly and if you reverse bias the LED nothing should happen but if it does...
  9. Delta Prime

    Selenium rectifier?

    I thought I was the only one. The owner has to paint the caboose red or he will be thrown underneath his own train.
  10. Delta Prime

    Outdoor string lights keep faulting

    Sounds to me like photo-degradation. Exposure to ultraviolet (UV) radiation can cause the significant degradation of many materials. UV radiation causes photo-oxidative degradation which results in breaking of the polymer chains, reduces the molecular weight, causing deterioration of mechanical...
  11. Delta Prime

    Wall Charger 120VAC to 5VDC

    https://www.monolithicpower.com/en/an-introduction-to-flyback-converters-parameters-topology-and-controllers https://www.infineon.com/cms/en/product/power/ac-dc-power-conversion/ac-dc-pwm-pfc-controller/pwm-qr-quasi-resonant-flyback-ics/...
  12. Delta Prime

    Comedy Thread

    Q: How does a power electronics engineer solve a MOSFET switching transient problem due to long cables? A: Through inductive reasoning.
  13. Delta Prime

    DAB Radio no longer producing sound

    My apologies.I appreciate you mentioning my mistake. I'll be more diligent in the future. Thank you for your "input"(pun intended). :) Merry Christmas.
  14. Delta Prime

    NiCd to Li-ion battery pack conversion successful but has one strange issue

    No sir. One fairy in particular... is responsible for letting out all the magic smoke in electronic components.
  15. Delta Prime

    Need help with a project

    More information is needed please. A bare PCB? Did you populate the PCB with the components? maybe you acquired a 30 amp battery charger without an enclosure? Does this discontinued spare part Have a manufacturer named to go with it? The transistor mounted on the heat sink are they...
  16. Delta Prime

    What incandescent lamp wattage to buy for PSU troubleshooting ?

    Hope I didn't confuse you. Like you I'm here to learn as well for me it's how to convey information so hears a polished version of what I trying to convey.Problem that every power-supply subsystem must expect: short circuits and resultant excessive current flow. The problem and opportunity when...
  17. Delta Prime

    What incandescent lamp wattage to buy for PSU troubleshooting ?

    Yes. If there's a short circuit on the output the light bulb is not going to help you. For example. Okay the power supply Max output voltage is 12 volts at 275 watts. Maximum output current is Watts divided by volts.275÷12=22.916Amps. Now you just bought a 12 volt 275 watt light bulb because...
  18. Delta Prime

    What incandescent lamp wattage to buy for PSU troubleshooting ?

    If you use an incandescent light bulb not an "LED light bulb" on the output of a power supply for a load then you must realize the low cold resistance results in an inrush current spike and can trigger over current protection circuits in the power supply unit under test.
  19. Delta Prime

    MIDI Sound module no output.

    My homemade crystal radio had a diode loop antenna coil... Sorry that's as close as I can get. Even back then I had an old fashioned fire extinguisher at the ready.
  20. Delta Prime

    MIDI Sound module no output.

    Always at the ready!
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