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Schematic that doesn't specify components ?

Discussion in 'Datasheets, Manuals and Component Identification' started by deoxit hufr, Jul 24, 2020.

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  1. deoxit hufr

    deoxit hufr

    9
    0
    Feb 24, 2017
    I want to wire up a simple foot switch for a guitar ampliifer. I have found
    the schematic for the amp and switch, but the schematic for the foot switch
    is not labeled with any values for resistors, diodes etc.

    I have a detail of the switch and also the full schematic, if someone could point me
    in the right direction of finding component values. I simply don't have the education,
    or insight of where to look for the answers on this.

    attached are a close up of the swtich and some specs I can't decipher
    and here is a link to the full schematic..

    https://el34world.com/charts/Schema...der_blues_deluxe_deville_reissue_vintage_.pdf

    thanks for helpful input..
     

    Attached Files:

  2. davenn

    davenn Moderator

    13,596
    1,875
    Sep 5, 2009
    the resistors and capacitors values are clearly labelled
    The diodes are probably basic 1N4000 series eg a 1N4004
     
  3. deoxit hufr

    deoxit hufr

    9
    0
    Feb 24, 2017
    Great... you can see what I can't... mind to point out where they are labeled?
    I am not experienced reading schematics, or it would likely be as obvious to me as it was to you.
     
  4. Martaine2005

    Martaine2005

    2,815
    754
    May 12, 2015
    C57 = 220 picofarad.
    R99 = 47Ω.
     
    davenn likes this.
  5. deoxit hufr

    deoxit hufr

    9
    0
    Feb 24, 2017
    ohh never knew about this code for the components.. 1st time to see and know
    is there a key that translates all of these?

    why is it C "57" meaning the 57th capacitor referenced ?

    D31 D32 are these different values? for diodes I suppose ..

    I wouldn't know what "key" words to use for search ...either

    maybe I need a complete book suggestion to read up on this

    merci, @Martaine2005
     
  6. Martaine2005

    Martaine2005

    2,815
    754
    May 12, 2015
    A key that translates?
    Into French?

    Yes there is. Called reference designators or refdes for short.
    R is resistor
    C is capacitor
    D is diode.
    The numbers after the letter help find an individual component. imagine having 500 resistors on one PCB.
    R1, R2, R3............R99 etc.

    Martin
     
    deoxit hufr likes this.
  7. Martaine2005

    Martaine2005

    2,815
    754
    May 12, 2015
    You edited your reply.
    Yes, exactly C57 = capacitor number
    57.
    D31 = diode number 31. Although the type is not given. As @davenn said, probably standard diodes like 1N4000 series or smaller.

    A fantastic book is “The Art Of Electronics”. By Harrowitz and Hill.

    Martin
     
    deoxit hufr likes this.
  8. bertus

    bertus Moderator

    745
    264
    Nov 8, 2019
    Hello,

    From page 6 of the given manual:

    fender_diodes.png

    From the footnotes:

    fender_other_diodes.png


    Bertus
     
  9. deoxit hufr

    deoxit hufr

    9
    0
    Feb 24, 2017
    ok... getting a better idea going along..
    thanks all
     
  10. bertus

    bertus Moderator

    745
    264
    Nov 8, 2019
    deoxit hufr likes this.
  11. deoxit hufr

    deoxit hufr

    9
    0
    Feb 24, 2017
    Yes, indeed they usually are, however some are bicolor, which you need to search down at the usual sites..
    digikey, mouser etc. Fender would prefer you buy a new amp, or even a new foot switch instead, so they
    don't usually make these parts available, or at the very least they would want you to pay someone "authorized"
    to do the repair. Hardly worth it to supply rehab parts to the DIY crowd for a foot switch, they go for around $40 new.
     
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