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  1. Replies
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    Closed: Re: How to choose JFET for front end amplifier

    Hi,

    I couldn't answer your question, sorry. An observation is that maybe audio needs switching jfets, 111/112 are for switching; types such as 5457 are signal jfets more bjt- like perhaps. There...
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    Closed: Re: TL431 temperature compensation method question

    Hi,

    ... Problem with phone line at present so won't be around for a while...

    Thanks for all the additional info./advice, helps with working through circuit as carefully as I can. Goal is to...
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    Closed: Re: TL431 temperature compensation method question

    Hi,



    Oh yes there is, if you're interested, REF102C, and it's not only from the days of Burr-Brown but it's also active and just utterly super looking. Seems better than some of the floating...
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    Closed: Re: TL431 temperature compensation method question

    The more I think of it, the more tempted I am to wait until I can afford the luxury of a 10V REF102, after getting endless bills and pressing needs/priorities out of the way... Anyway, it would make...
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    Closed: Re: TL431 temperature compensation method question

    Hi,



    Something like the REF102 (10V +-2.5mV) would be delightful, but returning to Planet Earth... I would like 10.000V at ~20ºC ambient, but again - not realistic. 9.990 to 10.010 would be...
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    Closed: Re: How to block unwelcome user replies?

    Hi,

    Thanks. Anything's better than nothing. Appreciate both your inputs.

    To be frank about what I think, I have interacted with a few people with "borderline personality disorder" before and...
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    Closed: Re: TL431 temperature compensation method question

    Thanks. Very, very informative replies.

    Nice idea about the bulb for a heat testbox, super.

    Post #3 Very eye-opening points made regarding simulation limitations, actual devices and also last...
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    Closed: TL431 temperature compensation method question

    Hi,

    Please no snarky remarks about the ridiculously unrealistic 33.98251k resistor, only purpose was to get exactly 10.000V in the simulation. :)

    I can't re-create 0ºC to 100ºC here at home nor...
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    Closed: How to block unwelcome user replies?

    Hi,

    To be clear: one thing is teasing and making fun of each other occasionally, we all do that here; another thing which is unacceptable is what appears to be an unhealthy, narcissistic mind with...
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    Closed: Re: Charging an unloaded capacitor

    Hi,

    Pardon my saying, better you than me: 1.5V and ~22mW... :)

    Probably not a great circuit and certainly a relatively different idea to what you're doing, but for the sake of a picture speaks...
  11. Closed: Re: Misconceptions and flaws noticed by the more educated...

    Back to the subject at hand, I had a quick review of the contents of books I've used, which are:

    The Art of Electronics (second edition)
    Teach Yourself Electricty and Electronics (fifth edition)...
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    Closed: Re: Charging an unloaded capacitor

    Hi,

    I wouldn't use a joule thief for what you're doing, afaik they are a poor-man's boost converters and not good for one component or other, don't remember which now, maybe especially the battery...
  13. Closed: Re: Misconceptions and flaws noticed by the more educated...

    Weak and meaningless blather as a riposte. Not only pompous but also a bad loser when trolling people on the wrong kind of forum who point out the emptiness of your argument(s) about topics...
  14. Closed: Re: Misconceptions and flaws noticed by the more educated...

    Hi,



    Agreed.
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    Closed: Re: Rise time issue- contrast from the datasheet

    Hi,

    In the words of - I believe I read it said by - Robert Kolmann (in another article): (sic) "Don't use the witches hat." Better measurements obtained with wire around ground ring on osc. probe...
  16. Closed: Re: Misconceptions and flaws noticed by the more educated...

    Hi,



    I am told we are (fortunately) in an interglacial, good conditions for "mammals" to engage in gardening, food production, and sunbathing 'n' stuff - I can't prove or disprove this and nor...
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    Closed: Re: Charging an unloaded capacitor

    Hi,

    What about trying an "active diode" between Q2 R3 and C1, then? MOSFET or BJT switch to block path when cap is charged, using a comparator to compare a voltage to a reference to turn the...
  18. Closed: Re: Misconceptions and flaws noticed by the more educated...

    Hi,

    Not interested in a tiresome, politely middle-class, passive-aggressive I'm right-you're wrong tennis match with words that you enjoy so much, but I must call you out on:



    Go into a room...
  19. Closed: Re: Misconceptions and flaws noticed by the more educated...

    Hi,



    What do you mean by that? I just don't understand and would like to.
  20. Closed: Re: Misconceptions and flaws noticed by the more educated...

    Hi,

    Like a lot of what is in this thread.

    Agree with wfeldman, it's important to understand that simulations are idealised and are not especially representative of real circuits, not sure if...
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    Closed: Re: Using MOSFET as load for voltage regulator?

    Hi,

    Besides what Klaus has said, remember we're dealing with an op amp - afaik, it's goal is life is to do whatever it has to at the output to keep the voltage(s) at the input pins the same.
    ...
  22. Closed: Re: Misconceptions and flaws noticed by the more educated...

    Hi,

    I don't include myself in your description, but as a layperson I would suggest a section that explains the importance of learning to read datasheets early on and avoid beginner's favourite:...
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    Closed: Re: Driving a buzzer using a transistor

    Hi,

    Post 8 shows how to calculate current from a voltage and a resistance:

    Amps = Volts/Resistance.

    5 Volts/16 Ohms = 0.3125 Amps.

    You need to look at your power supply and see if it can...
  24. Closed: Re: The simplest definition of VOLTAGE you can come up with

    Hi,

    In the dumbest terms possible? Voltage is the noun for electricity that comes from the person who discovered it, called Volta.
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    [SOLVED]Closed: Re: division of two values with op amps

    Hi FvM,

    Preface: lengthy answer is not confrontational, intended to add to what I think you meant. It's well-considered because I just want to check simulation to reality differences for now.

    ...
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