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  1. Closed: USB PD Lab Power Supply, flyback- vs forward-converter, pro's vs con's?

    Hello.

    I have what I think is a pretty neat idea, the latest laptop I bought feature a USB Type-C port which supports USB Power Delivery(USB PD)(my port is actually a Thunderbolt 3 port but it is...
  2. Closed: Unsure about this current sensor for use in saturation current measuring circuit.

    Hello.

    I acquired a sensor called S25P050D15X with the intention to use it in a circuit to measure the saturation current of ferromagnetic cores i.e. inductors and transformers, but my concern is...
  3. Closed: Re: Simplest way of converting 240Vrms mains into 450VDC?

    This is for a single-phase motor(fan).

    I have been thinking about voltage doubler directly at the mains but I don't know math good enough to be able to actually calculate the current that such a...
  4. Closed: Simplest way of converting 240Vrms mains into 450VDC?

    Hello.

    I am building a SPWM Variable Frequency Drive that should be able to output at least 240Vrms @ 50Hz to drive a fan that may consume at most 30W, as far as I know for that I need a DC rail...
  5. Closed: Using PLL(CD4046) to generate a 90° shifted signal, how to manage 10Hz - 1MHz?

    Hello.

    A couple of years ago or something I was getting advice here on EdaBoard about how to design a dual-channel Lock-In Amplifier(LIA) with the goal of being able to measure complex impedance...
  6. Closed: Re: Dimming a constant-current LED power supply with a half-bridge?

    I didn't think that I would need to dim lower than 150W, so I chose the driver version featuring an internal potentiometer that can be adjusted from the outside, in hindsight I should have chosen the...
  7. Closed: Dimming a constant-current LED power supply with a half-bridge?

    Hello.

    I have a high-power LED light armature, the light is dimmable from about 150W to 280W, but the 160W is still to bright.
    I am using a constant-current LED power supply from Mean Well(which...
  8. Closed: Re: How to deal with large offset voltage in high-power op-amps?

    The OPA544 and OPA541 have some desirable features but I think I will go for the OPA564, it has only a +-12V supply capability(the original design uses a OPA544 and +-35V) but it has far higher...
  9. Closed: How to deal with large offset voltage in high-power op-amps?

    Hello.

    I've found this for me very interesting circuit in a paper on Reaserchgate that shows the schematic for a 2mA - 2A AC/DC constant current source made with two OPA544 high-power op-amps, the...
  10. Closed: Is a multi-phase buck-boost converter possible?

    Hello.

    I have been reading about multi-phase synchronous buck-converters and there benefits compared to a ordinary buck-converter, and I have seen but not really read about multi-phase boost...
  11. Closed: Inverting or non-inverting buck-boost converter, does it matter in this case?

    Hello.

    By now it was quite a while ago but I have been talking about building a high-current mcu controlled vaporizer before, here is a schematic(please note that this is now no longer valid at...
  12. Closed: Re: IR2110 Full-Bridge, heating coil heat distrubution experiment, what about dead-ti

    Thanks for all the answers, they have sure given me some food for thoughts.

    Just ta clarify, I have never used a H-bridge before and due to what I have been told about the heating of a coil I...
  13. Closed: IR2110 Full-Bridge, heating coil heat distrubution experiment, what about dead-time?

    Hello.

    I have heard that if a heating coil(it isn't a coil as in inductance coil, it's simply a resistive heating element wound as a coil) is supplied with current in only one direction the...
  14. Closed: Re: Bought a 230V@10A Variac for 90USD, was this cheap or expensive?

    It has been sitting on the floor of my lab/work room for a while now and I if I actually do what I intend to do today I am about to give it a good cleaning over. I can't stand dirty main cables......
  15. Closed: Is there any consern with ESD when using air-compressor for cleaning with air-gun?

    Hello.

    I was about to buy a air-compressor, one of those with large containers on them that turn on and stores some volume of compressed air that can then be used to blow things clean with a...
  16. Closed: Re: Bought a 230V@10A Variac for 90USD, was this cheap or expensive?

    I'm don't think so, I don't know if it refers to anything else but I know that this is in Swedish a "sparkopplad" transformer which appears to be translated simply as an auto-transformer.

    I didn't...
  17. Closed: Bought a 230V@10A Variac for 90USD, was this cheap or expensive?

    Hello.

    I recently won an online auction for a variac rated:

    Primary: 230V
    Secondary: 3 - 250V
    Current: 10A
    Frequency: 50 - 60Hz
    Weight: 15,3kg
    Dimensions: 33*23*18 cm
  18. Closed: Re: Linear regulator does not need local input/output capacitor?

    Texas Instruments for one, have released a new family(it might be a single IC or more, can't recall) that are using the "no capacitor needed" feature to promote them self s, however if you read the...
  19. Closed: Re: Lock-in amp. related programmable band-pass/low-pass filter design.

    I'd like to thank everyone for all advice, I can't say how much a appreciate it.

    From the first time I talked about a LIA here on edaboard I have gotten the impression that a CPLD or FPGA would be...
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    Closed: Re: Acquire data out from a PC using MATLAB

    This link will present you with all that you need.
    I didn't remember that it is, or appears to be restricted to the Windows operating system and your sound card must be be able to work with "the...
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    5,756

    Closed: Re: Acquire data out from a PC using MATLAB

    Matlab does not have a generic USB interface, though it does utelize USB with the instrument control toolbox through the use of VISA or similar control protocol.

    One very neat feature in Maltab...
  22. Closed: Re: Lock-in amp. related programmable band-pass/low-pass filter design.

    Ok so about this simple LIA.

    I'll generate the excitation signal with my arbitrary function generator(alternatively a DDS module from ebay using some DDS from ADI) and then get a couple of ether...
  23. Closed: Re: Lock-in amp. Relatrogrammable band-pass/low-pass filter design.

    I'm sure that is solid advice, I will follow that suggestion.

    I have a few things I'd like to talk about regarding the realization of a phase sensitive detection(PSD) circuit though, you have...
  24. Closed: Lock-in amp. related programmable band-pass/low-pass filter design.

    Hello.

    I need to realize a couple of programmable filters as part of an lock-in amplifier design, I am sure that I need a programmable low-pass filter for the output of the phase sensitive...
  25. Closed: Attempting to use multiplying DACs to construct a Programmable Gain Amplifier

    Hello.

    I will for sure have a few questions about this subject, I hadn't planned to start this thread yet but I have a fundamental question that I need help with.

    How on earth do I look for...
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