Frequency central
Build documentation for:
System x s/h noise
Based on the Roland 100M 150 module
10K Lin 10K Lin
1M Rev Log 100K Log 100K Lin 100K Lin
Key to PCB screen print:
n:
This signifies NPN BC547 transistors. Note the correct pinout as shown by the half circles.
p:
This signifies PNP BC557 transistors. Note the correct pinout as shown by the half circles.
f:
This signifies FET 2N5485 transistors. Note the correct pinout as shown by the half circles.
Noise
(above FC logo):
This is the transistor used to generate the white/pink noise. Just a stock
BC547 is fine for this. But if you really wanna use that vintage mushroom cap BC178 that you pulled
from a 1970’s Farfisa organ – you go girl!
The PCB shows the correct orientation for BC547/BC557/2N5485. Other transistor types can be
used, but please observe the correct pinout.
Please observe the correct polarity of the electrolytic capacitors.
