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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).

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16 comments:

  1. danMay 9, 2019 at 8:41 PM

    finaly you made this week i build

    ReplyDelete
  2. BerkicauMay 18, 2019 at 10:09 PM

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

    ReplyDelete
  3. jandalesandsJune 11, 2019 at 2:06 AM

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

    ReplyDelete
  4. Athos CamposDecember 3, 2020 at 6:35 AM

    Can i use this with electret mics?

    ReplyDelete
  5. JDTJanuary 6, 2021 at 6:08 PM

    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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    Replies
    1. JDTJanuary 6, 2021 at 6:28 PM

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

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

      Delete
    2. Effects LayoutsJanuary 7, 2021 at 3:29 PM

      Thanks for verifying!

      Delete
  6. Zaraki1337January 17, 2021 at 3:39 PM

    Can i use jrc4558 instead of tl062????

    ReplyDelete
    Replies
    1. Effects LayoutsJanuary 18, 2021 at 9:50 AM

      Yeah, any dual opamp should work

      Delete
    2. Zaraki1337January 23, 2021 at 3:30 AM

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

      Delete
  7. Zaraki1337March 16, 2021 at 4:35 AM

    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?

    ReplyDelete
  8. Zaraki1337March 16, 2021 at 4:40 AM

    Is that 10uf for dc block???

    ReplyDelete
  9. anymousApril 27, 2021 at 12:00 PM

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

    ReplyDelete
  10. JuxSeptember 1, 2021 at 5:23 PM

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

    ReplyDelete