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  1. Hero999

    Need help understanding a technical spec

    It's per die. http://docs-asia.electrocomponents.com/webdocs/0f86/0900766b80f86647.pdf
  2. Hero999

    How this ps unit works??

    This circuit uses a bi-phase rectifier. Each diode acts as a single phase rectifier but the AC voltage applied to D2 is 180o out of phase, thus full wave rectification is achieved.
  3. Hero999

    Hi, somebody help me. (transistor)

    Sorry we don't do email here because it defeats the purpose of a forum. If you want to do email, join an electronics mailing list.
  4. Hero999

    QUESTION SOLAR PANEL AND POWER

    Measure the battery voltage. Your drawing doesn't show how the batteries are connected or the solar cell voltage. The battery voltage could be 12V, 24V, 36V or 60V, depending on how they are connected.
  5. Hero999

    Coupled output inductor design

    I don't understand the question. Generally, you don't worry about the inductance of the secondary coils. Wind the primary for the desired inductance, then wind the secondaries based on the turns ratio, rather than the inductance.
  6. Hero999

    pc fan control by temperature

    There's no resistor between the output and adj pin. Normally 120R is recommended but as it's possible you'll be able to use a higher value as the fan will provide the required minimum load.
  7. Hero999

    UV curable solder mask

    No, it won't just dry up. UV light is needed as a catalyst to cure it.
  8. Hero999

    Inverter oscillator

    Although the oscillator will normally work with two gates, it may fail to oscillate if C is small. A three gate oscillator is more reliable. http://www.fairchildsemi.com/an/AN/AN-118.pdf
  9. Hero999

    Inverter oscillator

    You can make an astable multivibrator with TTL but you need to use lower value resistors and higher value capacitors, as the input impedance is low.
  10. Hero999

    Programming cameras to detect patterns

    It requies a fair amount of processing power so you need a computer, not just a little microcontroller. A Raspberry Pi with the appropriate image recognition software (there are probably some free/open source programs for this) is probably the cheapest/easiest ay to do this.
  11. Hero999

    Help with voltage conversion

    It's fairly straight forward. The input voltage range is 2.75-0.55 = 2.2V The output voltage range is 5 - -5 = 10V The gain is 10/2.2 = 4.545V
  12. Hero999

    Electric Fan Relay Switch

    The PWM from the controller should be enough to light a small LED but its brightness will vary, depending on the speed of the motor.
  13. Hero999

    12V, 5V, 3A dual power supply based on the LM2596

    No. A PC SMPS is designed for 100V to 250VAC input. He needs to run it off 40VDC.
  14. Hero999

    Audio Switch Help

    Yes for stereo, you need separate switches for each channel.
  15. Hero999

    EL Wire Project

    EL wire typically requires about 90VAC to 150VAC at 200Hz to 1kHz to light. A bug zapper produces over 5kV. Your best bet is to buy an inverter specifically designed to power it.
  16. Hero999

    PC Heat Alarm Circuit Help

    Wow what a complicated way of doing it. Rather than a CA3130, two 555s and a speaker, I'd opt for an LM393 and a piezo buzzer. Have you tried testing the astable part of the circuit separately?
  17. Hero999

    7912 as negative voltage regulator issue

    Lol what amused me is he wasted 5 regulators without realising there was a problem with the circuit. The lesson is, if it gets hot and components smoke, check there's nothing wrong with the circuit before replacing them and trying again. Here's how to do it correctly.
  18. Hero999

    What do you think about a new do it yourself e-paper display kit?

    It seems like an interesting concept. The PDF you've posted contradicts itself. The specification says it's capable of driving 24 segments, yet the example in the photograph shows a display with 30 segments.
  19. Hero999

    What is the frequency of car parking sensors?

    I don't know, try measuring it with a frequency counter.
  20. Hero999

    424V on Bulk Capacitor Problem

    Have you measured the mains voltage? Does it have an active power factor correction module? Some PSUs have a boost converter for power factor correction, before the main filter capacitor.
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