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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. 
 
 
 
 
 
 
 
 
 
 

Содержание Cosmic Background

Страница 1: ...es 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 ...

Страница 2: ...film 470pF x 2 10nF x 1 100nF x 1 1uF electrolytic x 3 10uF electrolytic x 3 22uF electrolytic x 2 47uF electrolytic x 2 220uF electrolytic x 1 LM13700 x 2 TL084 x 2 BC547 x 3 BC557 x 2 1N4148 x 4 3mm red LED x 1 14 pin socket x 2 16 pin socket x 2 A100K x 2 B100K x 5 SPDT toggle x 1 100K trimmer x 1 3 5mm socket x 10 Male 40 pin header Female 40 pin header 10 pin box header x 1 Big knob x 1 Small...

Страница 3: ...ockets 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 Solder all electrolytic capacitors 7 Cut male headers to size and solder them into place Make sure that they stick out of the bottom of the PCB ...

Страница 4: ...then place the panel over them This will assure that the sockets are correctly positioned Flip the whole lot over and solder the sockets into place 5 Put the LED through its pads Present the panel to the PCB flip the whole lot over make sure the LED stick though the holes in the panel solder in place 6 Cut female headers to size and solder them into place Make sure that they stick out of the botto...

Страница 5: ...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 RDH 04 02 22 http www frequencycentral co uk ...

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