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  1. Closed: Re: Half-bridge versus Full-bridge for Power Dense supplies?

    transformer design will be critical here - better to rectify 5 x 1kV outputs and series, LCC 1/2 bridge would be my choice ...
  2. Closed: Re: Failed MOSFET in switch mode power supply for an audio mixer

    more heatsinking - or a fan ( perhaps small internal one ) are good ideas ....
  3. Closed: Re: Half-bridge versus Full-bridge for Power Dense supplies?

    the highest possible power density ever ... ?

    What is your max Vout ? - this will limit the power density

    1/2 bridge is fine for resonant designs at 1kW, you cannot use current mode...
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    Closed: Re: tda2030 amplifies noise

    Has the OP tried with batteries to see if the noise goes away?
  5. Closed: Re: Capacitor Burning issue due to unusual reasons

    Was it ever disclosed if the original offending cap was a tantalum type?
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    Closed: Re: Tip41c/42c arrangement problem

    Correct - the effect of the 100 ohm base current limiting resistor is to make the emitter follower ckt impractical - a properly driven transformer with a 71% PWM duty cycle on a 280Vpk output ...
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    Closed: Re: tda2030 amplifies noise

    Yes 200R pot should be 100k-ohms 470nF cap should be 4.7nF else you will attenuate a lot of the music frequencies ...
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    Closed: Re: tda2030 amplifies noise

    It would be instructive to try with a battery ( and vol pot turned to zero) to see if the noise was quieter compared to the Meanwell power supply - it may be that the chips you have are an early...
  9. Closed: Re: Capacitor Burning issue due to unusual reasons

    correct - in both pcb's the gnd copper appears to have no connection to the pcb push on connector ...
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    Closed: Re: Tip41c/42c arrangement problem

    the original ckt will be very power limited, at 15VDC in you will be lucky to get +/- 4V across the Tx pri at no load - the volt drop across the 100E resistor limits emitter o/p voltage quite...
  11. Closed: Re: Capacitor Burning issue due to unusual reasons

    I agree the source power supply is likely spiking up when some or all of the relays turn off, a 5W 18V zener should cure it ...
  12. Closed: Re: Capacitor Burning issue due to unusual reasons

    sorry, wwfeldman, this is not quite correct - capacitors carry AC and spike currents - some times quite large currents, a 10uF cap going from 12V to 15V in 10uS must carry (import )...
  13. Closed: Re: Capacitor Burning issue due to unusual reasons

    Is it - or was it - a tantalum capacitor? these are famous for failures

    else a high capacitance SMT part with an unknown dielectric - these can overheat due to ripple current - or...
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    Closed: Re: Tip41c/42c arrangement problem

    try ali-express for NJW0281 & 0302 ... 1000's there ...

    but yes the schematic has never been built and tested - otherwise the originator would know how bad it is ...

    email me for a...
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    Closed: Re: Using Patent Ideas for Next Product

    Two approaches: 1) find a patent holder and use their design, offer them a modest fee / royalty - it then becomes their problem to defend their IP

    2) Hire a power electronics consultant...
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    Closed: Re: Using Patent Ideas for Next Product

    you need to hire a patent attorney, patents last 18-20 years, they can be modified and a new patent issued to take account of the modification - however if your equipment only uses methods from...
  17. Closed: Re: Capacitor Burning issue due to unusual reasons

    where is the 10uF cap on the board ...?
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    Closed: Re: tda2030 amplifies noise

    If the power supply rails are "noisy" this may well translate to noise at the output - you mentioned the 12V power was from a meanwell power supply ... LC filtering probably a good test to see...
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    Closed: Re: hbridge control from mcu

    unfortunately Mr Rutman, the simple ckt you propose will have shoot thru issues at every transition - at least you can turn this one off ...
  20. Closed: Re: Saturation current of coupled inductor used in flyback smps

    you can also use a standard transformer and put parallel inductance on the o/p winding ...
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    Closed: Re: Best topology DCDC adjustable output

    getting 400VA out of a voltage multiplier will be a difficult process with high peak currents in the diodes and caps - but you are welcome to try ...

    the o/p choke averages the Tx o/p and...
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    Closed: Re: tda2030 amplifies noise

    noise is inherently wide band - there is no notching it out - most noise "filters" are low pass filters, I'm sorry I can't clarify further than " put a resistor in series with the 100pF cap ...
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    Closed: Re: tda2030 amplifies noise

    yes, you may want to try a 2k2 - 10k res in series with the 100pF too, on the LHS of the cap ...
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    Closed: Re: Tip41c/42c arrangement problem

    In the OP's ckt there is no attempt to modify the square wave into a sine wave, the DC blocking cap biases itself to 6V under normal operation - and the Tx sees +/- 6V ( ideally ) from a 12V...
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    Closed: Re: Tip41c/42c arrangement problem

    a cmos 555 will drive mosfets pretty well - esp at 50/60 Hz, so I imagine a bipolar one will too ... they just don't last due to the inherent shoot thru current spike in the o/p stage ( bipolar...
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