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Frequency Central System X S/H Noise Build Documentation

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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.

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Summary of Contents for Frequency Central System X S/H Noise

  • Page 1 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.
  • Page 2 Bill of Materials 10R x 1 22pF x 2 TL072 x 4 1M Rev Log x 1* 1K x 2 100pF x 1 BC547 x 7 100K Log x 1 2K2 x 2 1nF x 1 BC557 x 1 100K Lin x 2 4K7 x 3 2.2nF x 1 2N5485 x 2...
  • Page 3 Now it’s time to wire the PCB to the panel hardware. As there are rather a lot of connections to make, I’ve broken this down into two section. It’s worth reading both sections before you start soldering! Wiring the PCB to the panel hardware – Part I I recommend Kobiconn sockets (or clone) for this build.
  • Page 4 Wiring the PCB to the panel hardware – Part II We are going to work our was across the PCB from left to right (see photo). 1. Pink Out socket: socket output connects to Pink pad. Connect socket ground to Gnd pad. 2.

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