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BC184L transistor component

Andy Betts

I'm taking my first baby steps into circuit design, with the intention of making guitar effect pedals that are as close to the original vintage spec as possible... Here's my issue.

 

I'm laying out the schematic for the circuit, and went to the library to pull out a BC184L transistor and there wasn't one. The closest to it I could find was a BC109, however I would really like the 184L as that's the correct one for the circuit. can I just create a new one in the library from an existing component that's virtually the same, or is there a resource for obtaining the correct library file, or am I missing something blatantly obvious as a newbie.

 

 

Thanks for your patience in advance...

 

Andy

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  • Hi guys.

     

    Thank you all for your help, and comments. I've checked the schematic and that says that the 3 trannies in the circuit are BC169C, BC184C & BC109. However, I'm also working from an original photograph of the circuit and the trannies are ALL BC184L so I'll be going with that. The pin outs are the same on all those transistors I believe so i'll use the 109 from the library and rename it... Simples!! :-)

     

    For your interest, I'm recreating a Colorsound Power Boost version 2. The board will be the same, with board mounted pots, I just need to lay the circuit out in eagle and get the design as close to the trace as possible. I could manually trace the layout from the photo below, but it's a bit messy, and using Eagle to re-draw the circuit and create the board will ensure I don't make any ***-ups along the way as regards the circuit. I'm also sourcing (where practical) original components, so I've just received a delivery of NOS Mullard tropical fish caps the same as in the photo. all resistors are the same, I have however had to compromise with the axial electrolytic caps... I've gone with Vishay caps, a good brand and the same as what's used in the current power boost reissues.

     

    The photos below show a version 1 power boost, which had an extra 10k resistor which the version 2 didn't have. Apart from that they were identical.

    . imageimage

     

      imageimage

  • in reply to Andy Betts

    Andy Betts wrote:

    Thank you all for your help, and comments. I've checked the schematic

    and that says that the 3 trannies in the circuit are BC169C, BC184C &

    BC109. However, I'm also working from an original photograph of the

    circuit and the trannies are ALL BC184L so I'll be going with that.

    The pin outs are the same on all those transistors I believe so i'll

    use the 109 from the library and rename it... Simples!! image

     

    BC184C and L differ in pin mapping only. If you are creating a new

    layout anyway, I'd go with the version the makes for the easier

    routing.

    --

    Lorenz

     

Reply
  • in reply to Andy Betts

    Andy Betts wrote:

    Thank you all for your help, and comments. I've checked the schematic

    and that says that the 3 trannies in the circuit are BC169C, BC184C &

    BC109. However, I'm also working from an original photograph of the

    circuit and the trannies are ALL BC184L so I'll be going with that.

    The pin outs are the same on all those transistors I believe so i'll

    use the 109 from the library and rename it... Simples!! image

     

    BC184C and L differ in pin mapping only. If you are creating a new

    layout anyway, I'd go with the version the makes for the easier

    routing.

    --

    Lorenz

     

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