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  1. Replies
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    Closed: Re: Design of an isolated dc-dc power supply

    Hi, thanks for your replies. Treez, I’ll look into the files you’ve sent once I’m at my laptop.
    Application is a 64 cell li-ion active balancer, my plan is to step down the pack voltage from...
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    Closed: Design of an isolated dc-dc power supply

    Hi,

    I need a 100-150w isolated power rail.

    Hereís how I would probably try to achieve this: drive a transformer with a half bridge and a 555 generated high frequency square wave, rectify the...
  3. Closed: Re: LTspice Wolfspeed mosfet model doesn't seem to be working

    Thanks for your replies.

    Connecting Tj and Tc to ground fixed my issue. I thought I could leave them floating because when searching the internet for a fix, I came across this manual. On page 7,...
  4. Closed: LTspice Wolfspeed mosfet model doesn't seem to be working

    Hi,

    I've set up a simple circuit in LTspice using a model of Wolfspeed's C3M0075120K. I'm feeding the gate a square wave but I'm only seeing tiny current spikes at rise and fall going through the...
  5. Closed: Re: Calculating switching losses of a mosfet when switching energy is not given

    Thanks for your replies.
    I guess what it comes down to is that it's quite hard to calculate switching losses as they depend on a lot of factors, and that the calculations from my first post are...
  6. Closed: Re: Calculating switching losses of a mosfet when switching energy is not given

    Thanks for your reply.

    I donít really understand what youíre saying. Could you please elaborate or maybe give an example for this mosfet at say 500V and 10A drain-source driven by a 1kHz square...
  7. Closed: Calculating switching losses of a mosfet when switching energy is not given

    Hi,

    The title pretty much says it all. Iím not sure what factors these losses are based on. I saw somewhere you need to multiply the sum of the rise and fall time by the drain-source voltage and...
  8. Closed: Re: How do i check whether an I2C device works?

    The master is working, I know that because the onboard barometer (I2C slave) works.
    I’ve been doing some more research and came across an Arduino I2C Scanner sketch. It says it found a device at...
  9. Closed: How do i check whether an I2C device works?

    Hi,

    I ordered a gps and magnetometer module from eBay for my quadcopter. The gps works fine, but i canít get the I2C mag to work. (Iím using a Matek F405-CTR running iNav.)
    Before i ask for a...
  10. Replies
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    Closed: Re: Transistor max power?

    Thanks but i donít fully understand, could you give an example with a circuit like this?

    145804
  11. Replies
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    Closed: Re: Transistor max power?

    Thanks for the replies, cleared up a lot. So basically the 94 watts is the max output of R*I(squared) assuming you have an ideal heatsink.
    I’ve heard that the switching of the transistor generates...
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    Closed: Transistor max power?

    Hi,

    Iíll use the irfz44n as an example to explain what i would like to know.
    On the datasheet it sais max current is 49a, max voltage is 55v, resistance is 17.5mOhms and max power dissipation is...
  13. Closed: Effects of antenna shape and smps interference

    Hi,

    Iím hacking a pair of walkie talkies (446MHz) and i was wondering whether bending the antenna (90 degrees to the left, to fit the new case) would affect the range. I donít think so but i just...
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    Closed: 4ohm speaker with 8ohm amplifier

    Hi
    I've got an old amplifier (Pioneer SA-2001), it's got 4 channels (65w/channel). On the back, it says that it supports 8 and 16 ohm speaker and that you need to see the manual for 4 ohm use. I...
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    [SOLVED]Closed: Re: High power, small transformer?

    So the combined power of the transformers on the board is 300w, al their primaries are in parallel, connected to mains. And their secondaries go to separate smps's?
  16. Replies
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    [SOLVED]Closed: Re: High power, small transformer?

    I know, but smps's are dc-dc right? So where does it get that 300w dc from?
  17. Replies
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    [SOLVED]Closed: Re: High power, small transformer?

    Then how do they do it? Just feed rectified mains into the smps? If they aren't 300w transformers, what are they used for?
  18. Replies
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    [SOLVED]Closed: High power, small transformer?

    Hi
    Why is/are the transformer(s) in a 300w pc atx psu way smaller (and probably less expensive) than a 30v 1a (30w) transformer from my electronics shop?

    Cecemel
    ...
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    [SOLVED]Closed: Re: 12 to 50v dc boost converter

    Thanks for the help everyone. I ended up using an MC34063, as tanveerriaz suggested. After some research, I found it's a really common IC. Strange I didn't come across it before posting this thread..
  20. Replies
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    [SOLVED]Closed: 12 to 50v dc boost converter

    Hi
    I'm looking for trough hole ic's that could boost 12 to 50-60v adjustable (for charging caps so current doesn't really matter), with as little as possible external components. Output should be...
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    Closed: Re: [moved] 2 power supplies in series

    Haha ok. I'll just use 1 psu. Batteries will take a few minutes longer to charge but whatever. In the future I may buy a 24v supply from Banggood or something.

    Thx everyone!
    Cecemel:-P
  22. Replies
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    Closed: Re: [moved] 2 power supplies in series

    How about putting them in parallel?
  23. Replies
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    Closed: Re: [moved] 2 power supplies in series

    What do you mean by 'ac stage'? Just put multimeter in continuity mode and probed across gnd and earth pin on the plug, 0 ohms..

    Also, your thoughts on this page?...
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    Closed: Re: [moved] 2 power supplies in series

    Just checked and ground is connected to earth...
    Is it safe to open the psu, trace down the earth wire and just make sure it has no connection with the circuit board (while leaving it connected to...
  25. Replies
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    Closed: [moved] 2 power supplies in series

    Hi,
    I'm getting into rc and bought a 300w balance charger (input voltage: 10-28v). To get 300w tho, the input voltage needs to be higher than 18v. I've got 2 12v atx pc power supplies (14a) that I...
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