Buchla-ish Envelope Follower
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RefDesValueTypeQuantityNotes
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C147nFilm 2.54mm1
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C24.7uFElectrolytic 2mm1Fit on it's side after fitting Pot - see note on board.
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C3100pFCeramic COG/NPO1
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C41uF*Film or Electrolytic 2mm or 5mm1This sets the speed of the envelope. Lower the value for faster response. The trade off is the lower the value the more ripple you get at low frequencies. I've used 68nF on my first build which does leave ripple at bass frequencies.
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C5, C647uFElectrolytic 2mm2
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C7100nFilm 5.08mm1
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C8, C9, C10, C11, C13, C14100nFCeramic 2.54mm6
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C1210nFFilm 2.54mm1
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D1, D2, D3, D4, D51N41485
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D63mm LED1Solder in place before fitting the jacks, the 2 way and 3 way headers. Insert the jacks without soldering to get the LED at the correct height to the panel.
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J1, J2, J3, J5, J6, J7Thonk Jack1Wire the switching pin to the 0V pin on the Pre In Jack - these are the 2 pins close together.
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J4Euro 10 Pin Power 2.54mm1
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5 pin header1
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5 pin socket1
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3 pin header1
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3 pin socket1
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2 pin header1
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2 pin socket1
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L1, L2Ferrite Bead2Or 10-22R resistor
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P150k Linear (B)Alpha 9mm Pot Vertical1
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R1, R8, R18, R25, R261K5
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R2, R42M22
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R3, R14, R20, R21, R29100K5
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R5, R9, R13470R3
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R6, R23, R27, R284K74
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R7620R1
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R10, R1233K2
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R11, R1910K2
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R15, R16, R17470K3
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R221M1
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R306K81Increase this value for a higher comparator threshold.
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SW1On/OnSwitch SPDT 2.54mm1
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U1, U2, U3TL072CN3U1 is pre-amp I've used a NE5532
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