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  • specification of parts list and non standard numbers questions

    I have some questions on the specifications and rating of components. I am trying to figure out pricing and such and having some frustrations.


    1) temp rating: is lowest OK or should I choose one that is -20c to 120c (approximatly)
    2) capacitor rating, form and material I am assuming polyproplene/polyester material since none is given.
    3) strange numbers 2n2, 470r, 3r3 I assume 2200F, 470Ω and 3300Ω
    4) from factor of IC's pdip? I want to use through board and chip sockets
    5) diodes 500mW High Speed Switching Diode (general purpose)?
    6) a) Reject (sample delay) pot 100k LIN
    b) Audio (threshold) pot 250k LIN
    c) R06 resistor 100k multiturn preset
    7) any other things I may not know about?




    original component list
    Resistors (1% 250mW, unless stated otherwise)
    R3 3R3 2W
    R2 10R
    R14,R15 27R
    R28,R37 100R
    R18 220R
    R1 470R 2W (damping resistor)*
    R38,R39 680R
    R12,R16,R30,R32,R33 1k
    R7 1k2
    R24,R25 2k2
    R36 4k7
    R20,R23 6k8
    R4,R9,R10,R19,R21,R26,R27,R35 10k
    R5 20k
    R11 22k
    R8,R31 27k
    R13,R17 33k
    R34 47k
    R22 56k
    R6 100k multiturn preset
    R29 1M
    * Actual value is dependent on coil
    Capacitors
    C20 100pF
    C8 220pF
    C11 2n2
    C10 10nF
    C6,C16 47nF
    C21,C22 100nF
    C12,C13,C14,C15,C17 470nF
    C18 1uF
    C3 10uF 10V
    C2,C4 22uF 10V
    C7,C9 47uF 10V
    C5,C19 100uF 10V
    C1 1000uF 16V
    Diodes
    D1D9
    1N4148
    D10 MUR460
    Building the Minipulse Plus (REV-D) - [Doc. Ref. 20150712] 9
    Transistors
    Q2,Q6 2N3904
    Q5 2N3906
    Q1 IRF740
    Q3,Q4 J113
    Integrated Circuits
    U3 78L05
    U1 79L05
    U2 LT1054
    U6,U7 MC14538BCP
    U4,U10 NE555
    U5 NE5532
    U9 TL061 (or TL071)
    U8 TL062 (or TL072)
    Miscellaneous
    Battery pack 8x AA batteries (12V nominal)
    Search coil 300uH to 500uH (TX)
    Reject (sample delay) pot 100k LIN
    Audio (threshold) pot 250k LIN
    Speaker 8ohm to 64ohm
    OnOff
    switch

  • #2
    Originally posted by Cadmaster375 View Post
    I have some questions on the specifications and rating of components. I am trying to figure out pricing and such and having some frustrations.


    1) temp rating: is lowest OK or should I choose one that is -20c to 120c (approximatly)
    2) capacitor rating, form and material I am assuming polyproplene/polyester material since none is given.
    3) strange numbers 2n2, 470r, 3r3 I assume 2200F, 470Ω and 3300Ω
    4) from factor of IC's pdip? I want to use through board and chip sockets
    5) diodes 500mW High Speed Switching Diode (general purpose)?
    6) a) Reject (sample delay) pot 100k LIN
    b) Audio (threshold) pot 250k LIN
    c) R06 resistor 100k multiturn preset
    7) any other things I may not know about?
    Unless you're planning to detect in arctic like conditions I wouldn't worry too much about the temperature rating. The MPP is designed to use generic components wherever possible, and nothing is really that critical in the design.

    To limit the number of different components kept in stock, I generally use MFR4 1% resistors (even if a 10% tolerance would be ok) and ceramic multilayer capacitors.

    2n2, 470R, 3R3 are not strange numbers. This notation is known as the component marking standard. So, instead of writing 4.7k (for example), you write 4k7, thus removing the 'dot' (which can often get lost) resulting in a 47k resistor being fitted by mistake. In this case, 2n2 = 2.2nF, 470R = 470Ω, 3R3 = 3.3Ω. Basically, any number to the right of the symbol is considered to come after the decimal point.

    All the ICs are standard DIL packages.

    Everything else is fairly obvious.

    Comment


    • #3
      Originally posted by Qiaozhi View Post
      Unless you're planning to detect in arctic like conditions I wouldn't worry too much about the temperature rating. The MPP is designed to use generic components wherever possible, and nothing is really that critical in the design.

      To limit the number of different components kept in stock, I generally use MFR4 1% resistors (even if a 10% tolerance would be ok) and ceramic multilayer capacitors.

      2n2, 470R, 3R3 are not strange numbers. This notation is known as the component marking standard. So, instead of writing 4.7k (for example), you write 4k7, thus removing the 'dot' (which can often get lost) resulting in a 47k resistor being fitted by mistake. In this case, 2n2 = 2.2nF, 470R = 470Ω, 3R3 = 3.3Ω. Basically, any number to the right of the symbol is considered to come after the decimal point.

      All the ICs are standard DIL packages.

      Everything else is fairly obvious.
      Temperature coefficient for the ceramic multilayer capacitors? Make sure they are big enough to see. I ordered a selection awhile back and had to reorder a few sizes because they were to small for me to work with.

      Comment


      • #4
        Grab few more damping resistor values, if you are making an order make sure you buy few more values just in case.
        Ex: 470, 430, 520
        You can use 1 pot with switch (on/off) to save panel space.

        Comment


        • #5
          While I understand the need to save a few bucks here and there....

          From personal experience I would highly recommend buying the kit from SilverDog. It was like $51 shipped to my door.

          Had everything necessary to construct a working detector module.

          In my opinion, well worth the few extra bucks...

          Good Luck,

          Luke

          Comment


          • #6
            "pot 100K LIN" means potentiometer 100 KILO OHMS LINEAR.There are two types potentiometers-LINEAR and LOGARITHMIC."MRF" means METAL FILM RESISTOR.GOOD LUCK!

            Comment

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