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  1. Replies
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    Closed: Re: Voltage regulator... proportional?

    Hi,

    I'm not sure of how the camera voltage monitor works in relation to anything here, but anyway... What about a cheap ADC and sampling the three battery voltages periodically? You're spoilt for...
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    Closed: Re: circuit design help analog to Potentiometer

    Hi,

    That sounds very hard to implement. I wouldn't want to try with my limited experience.

    Not sure if voltage to pulse count + up/down counter + motor driver (h-bridge) + servo or stepper...
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    [PIC]Closed: Re: 7Amp Heater and PWM using MOSFET

    Hi,

    Why have a floating base? :) What about adding a 10k or even 100k to ground between the 220R and the NPN base.

    I agree with Klaus, e.g. best check the real value of the NMOS gate OFF...
  4. Closed: Re: Use an OR wired with diodes to control the gate in a PMOSFET

    Hi,

    You can just swap the comparator inputs over to invert the output.

    If it won't work that way, I'd try using two equal devices as the PMOS gate controllers/drivers, e.g. Two NPNs.
    Not sure...
  5. Closed: Re: Use an OR wired with diodes to control the gate in a PMOSFET

    Hi,



    Post #16 isn't the right one, I understand the schematic in post #18 fulfils the requirement. The requirement is still that either of two inputs when high make the output go low, right?...
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    [SOLVED]Closed: Re: First 555 project question

    Hi,

    Just to add a different idea, a discrete version could be made with a quad transistor array or 4 individual NPNs... Probably +- same number of components as two 555s.

    154612

    Just a...
  7. Closed: Re: Use an OR wired with diodes to control the gate in a PMOSFET

    Hi,

    Yesterdays version didn't fulfil the actual requirement of A or B = NOT Y, my apologies, this one does:

    154595
  8. Closed: Re: Use an OR wired with diodes to control the gate in a PMOSFET

    Hi,

    Just to add to what FvM has already provided, the schematic below is a small variation of the same premise:

    154586

    As this is only a simulation, although most work with occasional fine...
  9. Closed: Re: Use an OR wired with diodes to control the gate in a PMOSFET

    Hi,

    Your most recent schematic shows an AND-style configuration, not OR.

    AND (and NAND) are in series: A + B = C (or NOT C)
    OR would be in parallel: A or B = C

    Maybe start by putting the...
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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...
  12. Replies
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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...
  13. Replies
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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...
  14. Replies
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    1,644

    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...
  15. Replies
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    1,373

    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...
  16. Replies
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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...
  20. 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)...
  21. Replies
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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...
  22. 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...
  23. Closed: Re: Misconceptions and flaws noticed by the more educated...

    Hi,



    Agreed.
  24. Replies
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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...
  25. 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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