Frequency Central System X Amplifier Manuale

Build documentation for:

System X Amplifier

Based on the Roland System 100M VCA

Frequency central

Version 2 / April 2013

B100K B100K B100K A100K A100K

CV2 CV1 Initial Input 1 Input 2

Gain

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 2N5485 FETs. Note the correct pinout as shown by the half circles.

Gnd: Ground

Please observe the correct polarity of the 6 electrolytic capacitors. The 4 x 22uF are

configured in sets of 2 back to back (negative to negative).

The PCB shows the correct orientation for BC547/BC557/2N5485. Other transistor types can

be used (eg 2N3904/2N3906/BF245), but please observe the correct pinout.

Trimmers

Bias: Adjust Bias trimmer to sweet spot, ie a nice clean undistorted VCA output with no

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.

Linear: I tend to turn this to around fully anticlockwise.

Expo: I tend to turn this to around fully anticlockwise.

Bill of materials

560R x 2

1K x 2

3K3 x 1

6K8 x 1

8K2 x 1

10K x 2

15K x 3

22K x 1

33K x 2

47K x 1

68K x 1

100K x 3

150K x 2

180K x 2

1M x 1

47pF x 1

10nF x 1

22uF x 4

47uF x 2

CA3080 x 1

LF351 x 1

BC547 x 2

BC557 x 2

2N5485 x 1

A100K x 2

B100K x 3

All pots are 16mm Alpha.

22K trimmer x 1

100K trimmer x 2

All trimmers are 6mm

(Tayda)

SPDT toggle

Underside of the PCB showing:

-Ground bus between sockets and PCB

-Connections between inputs/outputs and PCB

I use solid core for all of the above.

RDH 31st May 2013

http://www.frequencycentral.co.uk/

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