+

9v

ACADAPTOR

INPUT 100k

250k

820k

Ge Diode42TM022

Ge Diode10k

100.1uF

220pF

2

3

1Ic1

10k

47uF 10k

8

4

Vb

+9V

Build the Neo-ctavia by A Colman based on the Bobtavia. Octave up that sounds like the Octavia. Transformer is Mouser P/N 42TM022 available at . Off board components except for the potentiometers are not shown on the layout. Trademarks are propery of their owners.

www.smallbearelec.com

Resistors1 - 100 ohm3 - 10k1 - 100k1 - 820k1 - 1M

Capacitors1 - 220pF1 - 0.1µF2 - 1µF1 - 47µF2 - 22µFIcsIC1 - 4558

Pots1 - 250k Lin1 - 100k Log

Other1 - 42TM0222 - Ge Diodes

Parts List

Schematic

LAYOUT

NeoCtaViaRev.1.Aug.27.2004

READY TO TRANSFER

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OUTPUT

6

5

7Ic1

1M

100k

VbVb

22uF

250K 100k

1 VOLUME

32

13

2

3 2 1 3 2 1

G A I NG A I N VOLUMEVOLUME

++

22uF

22uF

++

47uF

47uF

GNDGNDININ

OUTOUT

10k

10k

100k

100k

820k

820k

100100

1M1M

10k10k

10k10k

IC 1IC 1

+9V+9V

D1D1D2D2

0.1

0.1

220p

220p

0 ½ 1 1½ 2

0

½

1

1½

FP 2004

FP 2004

TONEPAD.COM TONEPAD.COMNEOCTAVIA NEOCTAVIAACOLMAN ACOLMAN