This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Tuesday, March 19, 2019

May I?

Got a request for this one. Another AC30/Rangemaster emulator to try and get Brian May's tone. Here's the schematic for reference. It calls for "BC245/256" JFETs for Q3-4, but I think that's a typo and should have the BF prefix. Should work with other JFETs as well. So socket and experiment with the usuals—J201, 2N5457, etc.

8 comments:

  1. You are correct, David... BF245-A transistors are indicated with most of the layouts I've seen. I have Guero's layout, taken from this thread:
    https://www.diystompboxes.com/smfforum/index.php?topic=73679.40

    Guero used an OC140 for Q1 and a J201 for Q4, for anybody who is interested.

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  2. This said - the most and very resembled sound of Brian May-

    https://www.youtube.com/watch?v=2yATuip8Wc4&t=212s

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  3. any chance with the deaci amp??

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  4. Can be marked as verified - I used two J201 transistors for JFETs and a Soviet MP35 NPN Germanium transistor

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  5. I have always wanted to do this one. Amazing little pedal. I only had 1 germanium tranny left and glad I did. I used a 1n100 ,or bat41 for the diode.

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  6. Could you omit some parts to get just an ac30 sim without the booster in front, also does it have a speaker sim in it?

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  7. built it too. Q1 should has hfe 80-100,when lower-not enough gain for other stages, i tried different MP,left mp38a hfe85. Q2-hfe 130-200, Q3Q4 used КП303а, J 201, Кп303и, all they working good, so i left кп303и. Wery nice working when CUT to min! Thanks, David!

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