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  1. Hero999

    EICO Model 1050 charger - parts & diagram's

    Don't worry if you think you've posted in the wrong place, leave it for a moderator to sort out. Don't create a new duplicate thread. It sounds like the rectifier has packed up and possibly the filter capacitors on the secondary. It shouldn't be hard to repair.
  2. Hero999

    Maximum current

    I wouldn't choose either option without more information about the power supply. If it was an exam, I'd calculate the expected current using Ohm's law and put a comment on the paper saying that it exceeds the capacity of the power supply which will fail or protect itself depending on the design.
  3. Hero999

    Maximum current

    1) Use Ohm's law. 2) If the load tries to draw too much current, the power supply will do one of the following: Overheat if the load is left connected for too long and catch fire if there's no protective thermal fuse. Overheat, then shut down and not turn back on again until either the power...
  4. Hero999

    Remote detonation in 1960s

    That's fine for a manual system, I thought he wanted automatic. The only purpose of the tone was to confirm that the device calling the bomb wants it to explode. It could easily be made so anything calling it triggers the explosion but that wouldn't be safe.
  5. Hero999

    Led display Digital Voltmeter question

    I assume you mean 100
  6. Hero999

    Remote detonation in 1960s

    The easiest way would've been some kine of tone detector system. The device calling the bomb would send a tone of a certain frequency which would trigger the explosion.
  7. Hero999

    Remote detonation in 1960s

    Yes, I'm pretty sure it was possible, even back then.
  8. Hero999

    2-4.5VDC input to 5VDC 1 amp output Boost Converter - need help troubleshooting

    Yes, the current and frequency are is too high for a bread board. You could try using stripboard but the best way is to build your own PCB.
  9. Hero999

    Dual Tracking Supply Design Not Working as Expected

    Good, glad we got there in the end.
  10. Hero999

    Dual Tracking Supply Design Not Working as Expected

    That's your problem, with a dual power supply, the 0V terminal is fixed at 0V regardless of the current flow, with a single supply the 0V terminal can float ay any voltage between either supply rail. If you connect the circuit to 36VDC and leave the ground connections unconnected they will...
  11. Hero999

    SPAMMERS

    Same old story:I can't delete them all, mixos needs to do something. You can help by reporting spam threads to me. Interestingly I've not received any reports of spam ever, so you're better off sending me a PM with a link to the thread rather than pressing the report button.
  12. Hero999

    24V to 5V 150A

    Not you need to a larger magnetic core, just increasing the rating of the semiconductors isn't good enough. You need a multiphase buck converter or a push-pull converter.
  13. Hero999

    Analog Filter advice required

    WHat are you doing with the signal? If it's going to an ADC you just need to make sure the clock is in phase with the pulses so you only sample when the analogue signal is above 0V. A sample an hold circuit clocked to the pulse frequency is another way of doing it.
  14. Hero999

    VEHICLE COUNTER/SENSOR

    You could count the cars gong past the sensor. I know the following are used as sensors: Pressure switch. Metal detector. Radar. In more sparsely populated areas each traffic light system will have its own PLC, in more urban areas all the traffic lights, will all be connected to one computer.
  15. Hero999

    Dual PWM

    By using the formula for an astable 555 found on the datasheet besides, I made a mistake it's 283Hz.
  16. Hero999

    Dual PWM

    MOSFETs don't require any current to siwtch,. The only problem is charging/discharging the high gate capacitance but you're only running it at 440Hz so it shouldn't be a huge problem.
  17. Hero999

    LED project. :(

    You could measure the voltage with a multimeter (assuming you have one), if it measures near 4.5V with nothing connected to the output it means it's regulated. Anther thing you could try is connecting two LEDs in series with a 120R resistor and connecting them to the output of the supply. If...
  18. Hero999

    Dual PWM

    It looks fine apart from the dual 555 timer part which seems pointless and will probably not work because the two oscillators will not be in phase with one another. Why not just connect the four MOSFETs in parallel and use one 555 timer?
  19. Hero999

    LED project. :(

    I can guess it probably is because it's too small to be an unregulated transformer and rectifier combination - there's no way you can make a 60Hz mains transformer that small. There again some very cheap SMPS are open-loop and are unregulated, although this tends to be the very small units...
  20. Hero999

    LED project. :(

    As usual with RadioShack there's no specification but going from the photograph, it looks like it'll be a switched mode power supply, which means it'll be regulated.
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