Frequency Central MU System X Dual ADSR Build Documentation

Based on the roland system 100m adsr

Frequency central

Build documentation for:

MU system X

Dual adsr

Based on the Roland System 100M ADSR.

MU System X Dual ADSR features: Main PCB, Sockets PCB x 6.

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.

Table of Contents

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Page 1 Dual adsr Based on the Roland System 100M ADSR. MU System X Dual ADSR features: Main PCB, Sockets PCB x 6. 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 330R x 4 1uF x 2 TL071 x 2 A500K x 2 10uF x 2 TL072 x 2 A1M x 4 1K x 6 47uF electrolytic x 2 B100K x 2 10K x 6 BC547 x 14 15K x 2 BC557 x 6 SPDT toggle x 2...
Page 3 Main PCB assembly - FRONT 1. Solder all diodes Solder all resistors. 3. Solder all IC sockets 4. Solder all transistors 5. Solder the 8 x Alpha pots, toggle and momentary switches. Make sure they fit snug to the PCB.
Page 4 Main assembly – REAR 1. Solder all of the 6 pin female headers. These will later accept the Socket PCBs 2. Solder the DOTCOM power header. Don’t forget to make it ‘keyed’ by removing the second pin in (the PCB won’t accept it otherwise – it’s keyed too!) 3.