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Type: Posts; User: d123

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  1. Closed: Opinions about plagiarized paper on an academic website

    Hi,

    I have a quandary: I mind my own business in life in general, however, yesterday I read AN-1075 (dated 2008) by Matthew Kessler at Analog Devices which starts with detailed description of Zeta...
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    Closed: Re: Offset / Gain interaction

    Hi,

    Could you make use of the +-12V dual supply and another op amp to cancel the offset and so not disturb the gain adjustment part?
  3. Closed: Re: Doing electronics on an office carpet (non ESD)

    Hi treez,

    You make a good point about permanent use and sporadic use related to esd failure.

    To be honest, only you can know whether to - and for which reasons/experiences - desist from a...
  4. Closed: Re: Doing electronics on an office carpet (non ESD)

    Hi,

    While not making 12kW converters, and fwiw but so you have a comparison, when in UK in two different houses with carpeted floors, and a cat, and wearing man-made fibre static-producing...
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    Closed: Re: 2n7000 ON resistance

    Hi,

    I think Klaus was being fair/honest, not rude. MOSFET datasheets are slippery characters, I find them pretty hard to understand. MOSFETs Vds falls when they are turned on, like BJT Vce (sat). ...
  6. Closed: Re: LDO load transient response in the event of a sudden load change

    Hi,

    Is there such a thing as a 'helper'/'booster' circuit, that is only enabled on sensing a sudden di/dt change to drive pass device harder and lock Vout to the preset level, or one that...
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    Closed: Re: Opinions about SEPIC versus Zeta converters

    Hi,

    Thanks for the feedback. Love to know about your experiences regarding its being hard to stabilize. In these months of simulating three different SEPICS with load steps of 10mA to 1.3A and...
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    Closed: Opinions about SEPIC versus Zeta converters

    Hi,

    I would like anyone interested in these topologies and/or with practical experience or knowledge of both SEPIC and Zeta to share their opinions.

    I read that SEPIC positives are that it is...
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    Closed: Re: Class A emitter follower power amp

    Hi,

    Can I ask: Isn't the diode also for Vbe temperature compensation? I'm sure I've seen AC amplifiers with diode at base like that in tutorials and some bjt app note or other, not just in emitter...
  10. Closed: Re: LDO load transient response in the event of a sudden load change

    Hi,

    Erm... I don't know about IC design, as you know. A month or so ago I was mucking around with a discrete component (1.25V shunt ref of TLVH431, another shunt as inner supply regulator of 2V,...
  11. Closed: Re: Looking for a dimmer circuit to drive a lamp up to 60w controlled by touch

    Hi,

    If accessible components means simple ICs, on the control side, counter such as CD4017 is good for incremental steps then reset (off) controlling relays, SSRs or MOSFETS with different load...
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    Closed: Re: TMR 6-0523 does not start

    Hi,

    A poor sticking plaster solution could be to start up with the 24R resistor at the output and when Vout is at the right value switch it out. 1 comparator controlling an NMOS + resistor path...
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    Closed: Re: Project using Opamps-intermediate level

    Hi Dana,

    Nice books, great links, thanks.
  14. Closed: Re: Determining Value of Capacitor Between PV Panel and DC-DC Convertor.

    Hi,

    Interesting to see articles you refer to. That's a big topic, worthy of study itself. Not sure if will help, it's about LC filters at input to SMPS, since 'An SMPS presents a negative...
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    Closed: Re: Rail-to-rail circuit simulation

    Hi,

    Maybe you meant to post in the Analog Integrated Circuit Design section. I don't know about this stuff, presumably a Bode plot (AC analysis in simulator I use) would be useful, and...
  16. Closed: Re: Relative Robustness of power semiconductors (generally)

    Hi,

    Surely you can calculate the PD of each device based on di/dt (RC current discharge rate) and compare to SOA besides calculating resulting junction temperature? I'm not familiar with MOSFET...
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    [SOLVED]Closed: Re: DC voltage isolation

    Hi,

    Not sure if galvanic isolation can do that.
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    Closed: Re: SOT-23-6 SMD Identification

    Hi,

    Complete guess: the 10k is used to set a current limit, soft-start or similar task. Sorry can't be of more help.
  19. Closed: Re: Looking for confirmation and real component values

    Hi,

    Glad you appear to have resolved your design questions.

    Not sure if you're familiar with the linked website. If not, might find some nice circuits and ideas there:

    Model Railroad & Misc....
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    Closed: Re: DC Motor with variable speed project

    Hi,

    Yes, that's a good idea. Look for the parts and post them here, then it's easier to develop your idea.

    A block diagram isn't so hard. Squares/Rectangles and lines/arrows joining them,...
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    Closed: Re: DC Motor with variable speed project

    Hi,

    Hard to say. In principle - yes it could work. Maybe show what you think might work - real parts and modules, that makes it easier for someone to offer meaningful advice and suggestions.
    ...
  22. Closed: Re: What is AD & BD modulations stand for in the Class-D amplifier modulation techniq

    Hi,

    Quick search with term ad bd modulation comes up with a lot of results: D = class D, A and B = order in which invented.

    This pdf may help: Ditect Digital PWM for Class D Amplifiers
  23. Closed: Re: 5V Rechargeable Battery(1.5A) for my project with charging module

    Hi,

    If it won't drain the battery too much, an integrated boost converter and LDO for the 5V output and a dedicated charger IC for recharging - maybe not small nor a module... Sparkfun Adafruit,...
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    Closed: Re: Simple AM modulator for my power oscillator

    Hi,

    This is for your website, right? Who is Mike? (Mike for Michael and mic for microphone)
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    Closed: Re: LiPO battery cell voltage and temperature

    Hi,

    :) I think less than secrecy, it's more a case of complicated chemistries. If you think about it, Li-ion is a 'young' technology. There is a lot of info - some more academic and some easier to...
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