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.

Thursday, May 9, 2019

Barcus-Berry 3000A

Stumbled across this schematic on FSB. It's a buffer/EQ/preamp for peizo pickups, specifically all Barcus-Berry electret microphone systems. I figured most would be building this into an instrument and not a pedal, so all the pots are off-board. If you're planning on running it only off a 9v battery, you cab get away without the power filter cap (47uF) or the polarity protection diode (1N4001).

15 comments:

  1. finaly you made this week i build

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  2. If I build it for an acoustic guitar and put it inside, like taylor acoustic, what d'you think brother?

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  3. can you go for a music man sabre II bass pre-amp.. it would nice for us bass player to upgrade our guitar.. ��

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  4. Can i use this with electret mics?

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  5. Verified, though I tested it with a TL072 chip.

    I don't have any instruments with piezo pickups, so I tested it with a regular electric guitar. It seems pretty transparent and clear.

    The effect level is at about unity with the volume knob maxed. You could replace the volume pot with a fixed resistor and have a good, small two-band EQ module to add to something else.

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    1. I also replaced all the weird resistor values with more common ones:

      2.15k -> 2.2k
      21.5k -> 22k
      27.4k -> 27k
      121k -> 120k

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  6. Can i use jrc4558 instead of tl062????

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    1. Yeah, any dual opamp should work

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    2. I tried didnt work i resoldered it again still didnt work..

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  7. Verified. Works good.. i kept volume pot 500k coz i didnt had 100k it works well


    Will there be any volume drop if i kep 500k instead of 100k?

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  8. i try cannot work..the baterry is hot...

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  9. hello there, what is the name with which it is stored in the Transfer Image Library? Thank you

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