Frequency Central System X Filter Manual

Build documentation for:

System X filter

Based on the Roland System 100M VCF

Frequency central

Version 2 / April 2013

B100K B100K A100K B100K A100K A100K

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. D, S, G is

signified should you want to sub alternatives.

Gnd: Ground

Please observe the correct polarity of the 2 diodes and 12 electrolytic capacitors. The 10 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.

Thermistor (next to 5K6 resistor)

I use a 10K NTC available from Tayda, seems perfect:

http://www.taydaelectronics.com/thermistors/10k-ohm-ntc-thermistor-5mm.html

…but, you can just use a 10K resistor if 100% temperature stability isn’t so important to you.

I can assure you, it’s pretty accurate anyway without the thermistor.

Trimmers

Offset - Trims the frequency up/down, should be just about fine in the mid position, but

adjust to taste.

V/oct –This filter can be set up to track V/oct fairly accurately over around 5 octaves.

1. Send 1V/oct keyboard into CV input 1 and turn it’s attenuator fully clockwise.

2. Play octaves, while adjusting the trimmer until you’re close.

3. Play 2 ocatves apart, adjust trimmer a little more…

Bill of materials

100R x 1

560R x 8

1K5 x 1

1K8 x 1

4K7 x 1

5K6 x 1

6K8 x 1

10K x 5

12K x 1

15K x 5

22K x 4

27K x 1

33K x 3

47K x 1

68K x 6

100K x 5

150K x 1

270K x 1

470K x 1

1M x 1

470pF x 4

22uF x 10

47uF x 2

10K Thermistor

LF351 x 2

LM13700 x 2

BC547 x 3

BC557 x 1

2N5485 x 4

1N4148 x 2

A100K x 3

B100K x 3

All pots are 16mm

Alpha.

10K trimmer x 1

100K trimmer x 1

All trimmers are

6mm (Tayda)

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 17th May 2013

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

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