Frequency Central Cosmic Background Build Documentation
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Frequency Central Cosmic Background Build Documentation

100% analogue fully modular super flexible drum voice module
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Frequency central
Build documentation for:
Cosmic background
100% analogue fully modular super flexible drum voice module
Main PCB
Control PCB
(top)
(bottom)
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.
The PCB shows the correct orientation for BC547/BC557. Other transistor types can be used (eg
2N3904/2N3906), but please observe the correct pinout. Please observe the correct polarity of the
electrolytic capacitors and diodes.

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Summary of Contents for Frequency Central Cosmic Background

  • Page 1 Frequency central Build documentation for: Cosmic background 100% analogue fully modular super flexible drum voice module Main PCB Control PCB (top) (bottom) 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 47R x 1 470pF x 2 LM13700 x 2 A100K x 2 100R x 3 10nF x 1 TL084 x 2 470R x 2 100nF x 1 BC547 x 3 B100K x 5 1K x 6 1uF electrolytic x 3 BC557 x 2 1K5 x 2 10uF electrolytic x 3...
  • Page 3 Main PCB assembly 1. Solder all diodes and all resistors. Tip - don’t mix up the 100R and 100K 2. Solder all IC sockets 3. Solder all non-electrolytic capacitors 4. Solder all transistors and the trimmer 5. Solder the power header – if you’re using box type, observe correct polarity 6.
  • Page 4 Note: Not all pots and sockets are equal in height. Providing you use the ones in the links provided, everything will line up perfectly. Make sure that you plug the Main PCB into the Pots ‘n’ sockets PCB the right way around – Frequency Central logo should be the right way up.
  • Page 5 Calibration Adjust Bias trimmer to sweet spot, ie a nice clean undistorted VCA output with no DC thunk when a snappy ADSR is applied to a CV input. I do this without any audio at the inputs. The chances are that that the sweet spot is around the mid position.

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