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Results 391 - 400 of 3952 in Forum
  • High Voltage | 555 Timer Plasma Speaker

    Posted by Chip Fixes on Saturday 26 March 2011 - 02:50:01
    As for the voltage rating for the mosfet, it needs to be around 3.3 times the input voltage. Also, since you are running with the flyback topology, th...
  • High Voltage | 555 Timer Plasma Speaker

    Posted by Chip Fixes on Saturday 26 March 2011 - 02:50:01
    For less heat, you should add a shunt capacitor across the mosfet. You don't need to run perfect class E or anything, but even if the capacitance i...
  • High Voltage | 555 plasma speaker problem

    Posted by magnet18 on Thursday 24 March 2011 - 04:02:52
    I tried those, couldn't get either of them to work, but I intended to build grenadiers in the future. @James, I believe they must be so large to en...
  • High Voltage | 555 plasma speaker problem

    Posted by magnet18 on Thursday 24 March 2011 - 04:02:52
    I'll have to try the circuit and see what happens with smaller caps. 1-2uF ought to be enough, and generally using polarized lytics in applications li...
  • High Voltage | 555 plasma speaker problem

    Posted by magnet18 on Thursday 24 March 2011 - 04:02:52
    10,000 uF is overkill for the half-bridge midpoint tap, but the types of capacitors he is using probably aren't rated for enough current, so paralleli...
  • High Voltage | 555 plasma speaker problem

    Posted by magnet18 on Thursday 24 March 2011 - 04:02:52
    Also not sure how I feel about the polarized capacitor on the *AC* audio input. He's a member of this forum, and I noticed that he had t...
  • High Voltage | 555 plasma speaker problem

    Posted by magnet18 on Thursday 24 March 2011 - 04:02:52
    I used the parts he said to use and it works just fine, the 10,000uf caps never ever get warm either. **The heat sink in the pictures is totall...
  • High Voltage | 555 plasma speaker problem

    Posted by magnet18 on Thursday 24 March 2011 - 04:02:52
    I'm sure it would work, I'm just wondering if some small film caps would work as well as the big relatively expensive lytics. I have loads of smaller ...
  • High Voltage | 555 plasma speaker problem

    Posted by magnet18 on Thursday 24 March 2011 - 04:02:52
    The divider caps value goes up with inverse square of the supply voltage, so if you use 1uF with 320 volts you need to use over 100uF at 24 volts, and...
  • High Voltage | 555 plasma speaker problem

    Posted by magnet18 on Thursday 24 March 2011 - 04:02:52
    I normally use a fraction of a uF at 160V, so even if I needed 100 times that at 24V that's still WAY less than 10,000 uF. I have loads of <1,000uF...
 
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