Mega Chorus & VibratoSeveral discrepancies were found between the PCB and schematic
* R24 found in 2 locations on schematic. The 2nd one has been labeled R57 on the mapped out PCB below
* R7 is 12K PCB and 15K schematic
* R25 is 12K PCB and 10K schematic
* R28 is 390R PCB and 470R schematic
* R30 is 2.2K PCB and 1K schematic
* R50 is 470K PCB and 220K schematic
* C2 is 1uf PCB and .47uf schematic
* C4 is .047uf PCB and .033uf schematic
* C8 .047uf PCB and .033uf schematic
* C20 is .047uf PCB and .01uf schematic
* VR7 & R53 are flip flopped on schematic
* IC2b is labeled as IC5b on schematic
* IC5b is labeled as IC3b on schematic
* Pins 2&3 of IC5a are flip flopped on schematic
Resistors
R101 - 1M (pulldown)
R1 - 1K
R2 - 1M
R3 - 10K
R4 - 47K
R5 - 10K
R6 - 47K
R7 - 12K (15K on Schematic)
R8 - 12K
R9 - 10K
R10 - 100K
R11 - 10K
R12 - 10K
R13 - 10K
R14 - 10K
R15 - 4.7K
R16 - 56K (see build instructions for which location)
R17 - 330K
R18 - 10K
R19 - 10K
R20 - 10K
R21 - 10K
R22 - 330K
R23 - 10K
R24 - 10K
R25 - 12K (10K schematic)
R26 - 12K
R27 - 10K
R28 - 390R (470R schematic)
R29 - 100K
R30 - 2.2K (1K schematic) (LED)
R31 - 100K
R32 - 10K
R33 - 10K
R34 - 47K
R35 - 10K
R36 - 10K
R37 - 1K
R38 - 33K
R39 - 68K
R40 - 6.8K
R41 - 10K
R42 - 10K
R43 - 390R
R44 - 4.7K
R45 - 6.8K
R46 - 10K
R47 - 10K
R48 - 10K
R49 - 10K
R50 - 470K (220K schematic)
R51 - 4.7K
R52 - 4.7K
R53 - 33K
R54 - 2.7K
R55 - 33K
R56 - 470R
R57 - 47K
VR1 - B50K Tone
VR2 - B100K Rate
VR3 - B10K Blend
VR4 - B100K Shape
VR5 - 50K Trim
VR6 - B100K Depth
VR7 - B500K Delay
VR8 - 25K Trim
Capacitors
C1 - .047uf
C2 - 1uf (.47uf schematic)
C3 - .0068uf
C4 - .047uf (.033uf schematic)
C5 - .0033uf
C6 - .0082uf
C7 - 470pf
C8 - .047uf (.033uf schematic)
C9 - .0082uf
C10 - .001uf
C11 - 1uf
C12 - .0082uf
C13 - .001uf
C14 - .047uf
C15 - .0068uf
C16 - 1uf
C17 - 10uf
C18 - .47uf
C19 - 10uf
C20 - .01uf
C21 - 47pf
C22 - 10uf
Semiconductors
IC1 - TL072 (dual op-amp)
IC2 - TL072 (IC5b schematic)
IC3 - MN3207 (BBD)
IC4 - MN3101 (clock)
IC5 - TL022
IC6 - 78L08 (voltage regulator)
Q1 thru Q8 - 2N3904
D1 - LED
D2 thru D5 - 1N4148
Attachment:
File comment: Mega Chorus PCB
Mega Chorus.jpg [ 681.08 KiB | Viewed 17292 times ]
See build instructions for schematic. High-res schematic can be downloaded here:
http://byocelectronics.com/megachorusschematic.pdf