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    Closed: Using a 1.8V MCU with a micro-SD card

    I'm having a hard time figuring out how this is done. I'm reading that some memory cards do support 1.8V signalling, but I don't know which type of cards these are. I'm also not sure if these cards...
  2. Closed: Re: Can't stop LTC3780EG Buck-Boost regulator from oscillating

    I think I figured it out. My bootstrap diodes (D7 and D26) were no good. Either they couldn't supply the current or their reverse recovery time was too long, either way they failed to charge the...
  3. Closed: Re: Can't stop LTC3780EG Buck-Boost regulator from oscillating

    Here is the output. The 20khz oscillation is visible:

    155272

    AC coupled:

    155273

    The 0.01R current sense resistor is of the same value as the one the datasheets displays. It has to be of a...
  4. Closed: Can't stop LTC3780EG Buck-Boost regulator from oscillating

    Hi. I'm using a LTC3780EG Buck-Boost regulator as a part of a MCU-controlled battery charging circuit. The circuit is apparently working fine with a steady output voltage, but it's efficiency is only...
  5. Closed: Re: Need help with communication through a resonant inductive coil

    I'm just looking for ways of modulating and demodulating the digital information. Lets say I don't have an inductive link, but rather just a piece of copper as the transmission line. How do I convert...
  6. Closed: Re: Need help with communication through a resonant inductive coil

    Thanks for the reply :) The power would be about 60W or so. Resonant frequency about 170khz.

    With my limited experience with this in mind, I was thinking of some 'finished' solution. An IC with...
  7. Closed: Need help with communication through a resonant inductive coil

    Hello :) I'm making an inductive power transfer system that is in the need of a way of communicating through the inductive link. My first thought was to modulate the current draw on the receiving...
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    Closed: Re: Need help stabilizing a switching regulator

    Thanks for the replies. I've read the datasheet of the regulator, but there are a lot of confusion about loop compensation, 'adding dominant pole' and such terminology, I should really like a class...
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    Closed: Need help stabilizing a switching regulator

    Hi. I need to design a switching regulator with 48V input, 0-40V, 0-10A output. I've chosen the LM5117 for this purpose. I want a pose a general question regarding switch mode regulators like these....
  10. Closed: Is core loss in an inductor proportional to it's inductance value?

    I have a filter inductor that filters out the switching frequency of a class D amplifier for a work related project. Efficiency of the amplifier is important so I want the core loss in the inductor...
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    Closed: Re: Finding mosfets for lowest switching loss

    Thanks for the replies. I'm not looking to calculate an exact value, I'm just wondering what parameters to look for when choosing a mosfet. Assuming Vgs=Vds=12V (as it is in my application) and...
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    Closed: Re: Finding mosfets for lowest switching loss

    I see. So when looking at the energy expended by turning a mosfet on and back off, it will suffice to sum the input and output capacitances (assuming that Vgs=Vds) and treat the mosfet as a capacitor...
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    Closed: Finding mosfets for lowest switching loss

    I'm designing a class D amplifier for a work related project. One of the key parameters are low quiescent current and I've figured out that the type of N-ch mosfet used is by far the biggest factor....
  14. Closed: Filtering of VDDA pins on microcontrollers?

    Hello. On some MCUs, the supply pins of the analog circuitry are separated from the digital circuitry. I assume this is to allow for the possibility to supply the analog circuitry with a cleaner...
  15. Closed: Looking for a spring loaded thumb-press wire terminal

    I have no idea what these terminals are called, but I got a picture of one. I need an easy way to insert a piece of stripped wire, where can I find something like this?

    148419
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    Closed: Re: Low power 1.8V to 12V buffer?

    This is my best solution so far:

    147694

    It draws a maximum of about 10uA, almost all of it from U56. Vbat is about 11V and it has a positive going threshold voltage of maximum 7V at 10V supply...
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    Closed: Low power 1.8V to 12V buffer?

    Hi. I'm looking for a way to convert a 1.8V signal to 12V with very low power consumption. I can't find any buffers or level shifters that can support 12V (ideally 16V to be sure), and mosfet drivers...
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    Closed: Re: Why does this current limiter oscillate?

    This particular op-amp has a maximum allowable input voltage of vcc-0.2V and gnd+0.2V, it starts doing weird stuff if I exceed these limits. Perhaps I could allow a shunt resistor big enough to get...
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    Closed: Re: Why does this current limiter oscillate?

    I tried increasing the shunt resistor to 1Ohm, set a reference voltage on the non-inverting input to 12V-91mV and then connecting the shunt resistor directly to the inverting input thus omitting the...
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    Closed: Re: Why does this current limiter oscillate?

    Thanks for the replies. Here is the datasheet for the P-ch: http://www.farnell.com/datasheets/2040100.pdf?_ga=2.241469314.1022783371.1528779725-1999638445.1520919083

    I apologize for not being...
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    Closed: Re: Why does this current limiter oscillate?

    I can't get the datasheet for Q1 until Thursday, but here is the datasheet for U8:...
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    Closed: Why does this current limiter oscillate?

    I'm struggling to figure out why the circuit below oscillate at about 2-300khz. Changing the value of C10 seems to have no effect, neither does adding an output gate resistor, or adding a input...
  23. [SOLVED]Closed: Re: Triangle wave generator makes an ugly triangle wave

    The amplitude was set too high. Increasing R118 to 13k fixed it :) Thank's for all the replies
  24. [SOLVED]Closed: Triangle wave generator makes an ugly triangle wave

    As a part of a work related project I have to use a triangle wave generator as a part of a class D amplifier. The generator works, but the quality of the triangle wave causes distortion. I'm having a...
  25. Closed: Re: How big is core losses in an inductor at 40kHz?

    KlausST: I posting the complete circuit is a bit irrelevant as the topic of this thread was really only about core loss vs. frequency and whether core loss could be a substantial factor at 40kHz, a...
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