• What are these electronilc parts

    From micky@21:1/5 to All on Tue Apr 13 23:43:29 2021
    XPost: sci.electronics.repair, alt.home.repair

    What are the devices in these two parts of a schematic

    https://imgur.com/a/mnnzq3O

    On the left is probably the lighting for the 2005 Solara trip computer.
    The schematic calls it the Upper Console Panel Sub-Assembly which I
    think is the part above the radio (but the schematic lists the clock illumination separately and makes no reference to the outside
    thermometer, so that just lives the sort-of trip computer.)

    I understand the LEDs but why zener diodes, and another diode (since
    there is 12V DC at the top and ground at the bottom)?


    On the right is almost all of what the Toyota wiring manual calls the combination meter, meaning the speedometer and other meters in the
    instrument cluster. I aassume the "rheostat" is the thing it has to
    adjust the brightnees, that the LED (or more than one) provides the
    light, but what are the strange things at the bottom and to the right.

    They look like they are connected to transisors, but they have the 3
    vertical lines, one of which in each set has a left-point arrow.

    The manual has a list of symbols and it has LED, photodiode and zener
    diode, but not the strange things in that picture.


    BTW, was this an appropriate post for Imgur? Most of their posts sseem
    to be more entertaining.

    I though I had flickr and instagram but I can't find the login info. I
    don't understand all this computer stuff.

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  • From rbowman@21:1/5 to micky on Tue Apr 13 21:57:37 2021
    XPost: sci.electronics.repair, alt.home.repair

    On 04/13/2021 09:43 PM, micky wrote:
    They look like they are connected to transisors, but they have the 3
    vertical lines, one of which in each set has a left-point arrow.

    https://byjus.com/physics/mosfet/

    Too bad you have me blocked, but so it goes.

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  • From Rod Speed@21:1/5 to micky on Wed Apr 14 14:48:31 2021
    XPost: sci.electronics.repair, alt.home.repair

    micky <NONONOmisc07@fmguy.com> wrote

    What are the devices in these two parts of a schematic

    https://imgur.com/a/mnnzq3O

    On the left is probably the lighting for the 2005 Solara trip computer.
    The schematic calls it the Upper Console Panel Sub-Assembly which
    I think is the part above the radio (but the schematic lists the clock illumination separately and makes no reference to the outside
    thermometer, so that just lives the sort-of trip computer.)

    I understand the LEDs but why zener diodes,

    Those provide a constant voltage across the leds so that the
    intensity of the leds doesn't vary with the battery voltage.

    and another diode

    That protects against a reversal of the battery.

    (since there is 12V DC at the top and ground at the bottom)?

    The 12V is nominal and will vary with the state of the battery.

    On the right is almost all of what the Toyota wiring manual calls the combination meter, meaning the speedometer and other meters in
    the instrument cluster. I aassume the "rheostat" is the thing it has to adjust the brightnees, that the LED (or more than one) provides the
    light, but what are the strange things at the bottom and to the right.

    N channel MOSFETs
    https://www.google.com/search?q=fet+schematic+symbol

    They look like they are connected to transisors, but they have the
    3 vertical lines, one of which in each set has a left-point arrow.

    The left-point arrow arrow means that they are N channel MOSFETs.

    The manual has a list of symbols and it has LED, photodiode
    and zener diode, but not the strange things in that picture.

    BTW, was this an appropriate post for Imgur?

    Only if you are into fucking electronics.

    Most of their posts sseem to be more entertaining.

    I though I had flickr and instagram but I can't find the login info.
    I don't understand all this computer stuff.

    Its actually electronics.

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  • From Arie de Muijnck@21:1/5 to micky on Wed Apr 14 11:08:03 2021
    XPost: sci.electronics.repair, alt.home.repair

    On 2021-04-14 05:43, micky wrote:

    What are the devices in these two parts of a schematic

    https://imgur.com/a/mnnzq3O

    On the left is probably the lighting for the 2005 Solara trip computer.
    The schematic calls it the Upper Console Panel Sub-Assembly which I
    think is the part above the radio (but the schematic lists the clock illumination separately and makes no reference to the outside
    thermometer, so that just lives the sort-of trip computer.)

    I understand the LEDs but why zener diodes, and another diode (since
    there is 12V DC at the top and ground at the bottom)?

    The zeners take over when a LED fails open circuit. The other LED then
    still gives some light.
    The middle and bottom diodes protect against polarity reversal (one
    would have been enough, but probably there are two identical assemblies
    in ssries).

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  • From Adrian Caspersz@21:1/5 to micky on Wed Apr 14 12:52:09 2021
    XPost: sci.electronics.repair, alt.home.repair

    On 14/04/2021 04:43, micky wrote:

    What are the devices in these two parts of a schematic

    https://imgur.com/a/mnnzq3O

    On the left is probably the lighting for the 2005 Solara trip computer.
    The schematic calls it the Upper Console Panel Sub-Assembly which I
    think is the part above the radio (but the schematic lists the clock

    It's not a electronics schematic, it's a electrical wiring diagram for
    auto mechanics. There is a lot that Toyota have chosen not to display,
    lest you not buy their spare parts as complete modules. But they have
    given you a general sense of what they do.

    I understand the LEDs but why zener diodes, and another diode (since
    there is 12V DC at the top and ground at the bottom)?

    Zener diodes to avoid spikes killing the LED, reversed biased they will
    clamp the voltage to a maximum.

    The other diode is reverse polarity protection, as generated by spikes,
    faults or mildly idiotic users.

    On the right is almost all of what the Toyota wiring manual calls the combination meter, meaning the speedometer and other meters in the
    instrument cluster. I aassume the "rheostat" is the thing it has to
    adjust the brightnees, that the LED (or more than one) provides the
    light, but what are the strange things at the bottom and to the right.


    N-Channel Mosfets.
    https://en.wikipedia.org/wiki/MOSFET

    They look like they are connected to transisors, but they have the 3
    vertical lines, one of which in each set has a left-point arrow.

    Try a post to sci.electronics.basics


    The manual has a list of symbols and it has LED, photodiode and zener
    diode, but not the strange things in that picture.


    The actual reality, choice of parts etc... is up to Toyota.


    BTW, was this an appropriate post for Imgur? Most of their posts sseem
    to be more entertaining.

    For displaying pictures for us, certainly. Preferable to the other two.


    I though I had flickr and instagram but I can't find the login info. I
    don't understand all this computer stuff.

    If you don't understand "two factor authentication / two step
    verification", I'd step very carefully on the internet, and close down
    what you don't use.

    As far as I'm concerned, Instagram is for kids.

    --
    Adrian C

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  • From Tekkie⌐@21:1/5 to All on Thu Apr 15 17:09:01 2021
    XPost: sci.electronics.repair, alt.home.repair

    On Tue, 13 Apr 2021 21:57:37 -0600, rbowman posted for all of us to digest...


    On 04/13/2021 09:43 PM, micky wrote:
    They look like they are connected to transisors, but they have the 3 vertical lines, one of which in each set has a left-point arrow.

    https://byjus.com/physics/mosfet/

    Too bad you have me blocked, but so it goes.

    You mean those things that blow up when they are backfed?

    --
    Tekkie

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  • From Reinhard Zwirner@21:1/5 to rbowman on Fri Apr 16 19:09:03 2021
    XPost: sci.electronics.repair, alt.home.repair

    rbowman schrieb:
    On 04/13/2021 09:43 PM, micky wrote:
    They look like they are connected to transisors, but they have the 3
    vertical lines, one of which in each set has a left-point arrow.

    https://byjus.com/physics/mosfet/

    Umm.

    <https://www.bilder-hochladen.net/files/big/12b4-yj-6269.jpg>

    Somehow worried

    Reinhard

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