Build options for the Karplus Strong board
There are two configurations for the Karplus Strong board: for modular use or for eChucK use with a computer interface. The parts needed for the computer interface are marked with a *. For both configurations its possible to build with batteries, if you want to use the batteries, all parts with ** are needed.
There is an optional distortion mod using two LEDs and trimmers, those are indicated by the ". Omit if you don't want the distortion mod.



Updated BOM for the Karplus Strong board

Resistors
Value	Qty	Parts
100	1	R44*
200	2	R15, R16
1k	4	R6, R40, R45*, R46*
2k	1	R12
2.2k	1	R37
5.1k	2	R14, R27*
5.6k	2	R1, R2
10k	6	R10, R26*, R29, R31, R32, R33
20k	1	R17
30k	2	R8***, R13***
39.9k	1	R11
100k	17	R3, R4, R5, R7, R9, R18, R20, R21, R22, R23, R24, R25, R28, R30, R36, R38, R41

Capacitors
Type	Value	Qty	Parts
ceramic	0.1u	9	C2, C3, C5, C14, C16, C17, C18, C19, C20
ceramic	0.022u	1	C7
elec	1u	1	C13*
elec	10u	7	C1, C4, C6, C9, C11, C12, C15
ceramic	18p	1	C8
ceramic	470p	1	C10

Semiconductors
Value	Qty	Parts
LED	2	LED1", LED2"
1N4148	4	D1, D2, D6**, D7**
Zen-4V7	2	D3, D4
2N2222	2	T1, T2*
LM7805	1	IC1
TL074	1	IC2
LM13700	1	IC3
MN3207	1	IC4
MN3102	1	IC5

Potentiometers
Type	Value	Qty	Parts
Trim	10k	2	R19", R34"
Trim	100k	1	R39
Linear	10k	1	R35
Linear	100k	2	R42, R43

Other parts
Value		Qty
Stereo Jack*	2	
Mono Jack	6
Switch DPDT**	1

Build options:
 - For modular use: omit all parts with *
 - If not using battery power, omit all parts with **
 - The configuration shown is for +/-15 V use. If you want another voltage. replace *** with appropriate values. 12V: 24k, 9V: 18k.