![background image](http://html1.mh-extra.com/html/fuzzdog/quack-machine/quack-machine_quick-start-manual_2352546002.webp)
R1
1M
R2
1M
R3
10K
R4
47K
R5
10K
R6
2.2M*
R7
100R
R8
47R
R9
47K
R10
47K
R11
22K
R12
470K
R13
470K
R14
470K
R15
47K
R16
47K
C1
47n
C2
47n
C3
4n7
C4
4n7
C5
47n
C6
10n
C7
1n
C8
10u
C9
10u
C10
10u
D1,2
Red 3mm LED
D3
1N4148
Q1
2N5457
Q2
2N3904
IC
TL072
RANGE
20/25KB**
SENS
100KB
Sch BOM
*In most cases R6 will be good for the gain setting. If you
prefer you can use a smaller value and add a trimmer in the
GAIN spot to adjust to taste.
**Range can be an internal trimmer or external pot.
If you like to fiddle, use a pot. If you like set and forget you
know what to do.