The Sound Lab Mini-Synth
Board Revision Information.

Back to "Music From Outer Space" Sound Lab Mini-Synth Page
The Sound Lab PC board has seen a few revisions and this information is to support people who have bought past versions.
View Rev 000 VCO Schematic

Sound Lab Mini-Synth PCB (Printed Circuit Board)
Shown Parts (Top) Side Up

No-Etch Alternative: Sound Lab Mini-Synth Strip Board Layout

In order to use this artwork you need to print it so that the DIP IC pad holes are exactly 1/10 inch apart and 3/10 inch across. I put a lot of extra holes for any modifications you might want to make. Inspect your board to make sure none of the lands or pads are shorted. Make sure none of the lands are open. Scrape away any shorts with a Xacto knife and solder some small copper wire between any opens.

  Sound Lab Bottom Copper Rev 002 (Parts Side View)
Rev 002 boards can be identified by the presence of pads to support the 1V/Oct mod (some also have a slightly different prototype area) Some boards do not have the silk screened parts legend showig the positions and values for the 100 ohm trimmer and 475 ohm resistor but the diagrams below show exactly where to mount them. Additionally each hole has a top anular ring. The Rev 002 board's size is 6.6 x 3.7 inches. You must choose one of the following configurations. All of the other drawings still apply.

      Sound Lab PC Board Rev 002 Alternate Configuration.

IMPORTANT INFO FOR REV 002 PC BOARDS!
You must do one of the following or your oscillators will not oscillate at all.

  Sound Lab Rev 002 PC Board Using 1V/Oct mod (Parts Side View)

To implement the 1V/Octave modification insert (2) 100 ohm trimmers and (2) 475 ohm resistors in the areas indicated by the silk screened parts legend.

  Sound Lab Rev 002 PC Board NOT Using 1V/Oct mod (Parts Side View)

To NOT implement the 1V/Octave modification just insert (2) wire jumpers in the indicated areas.
Do not install the 100 ohm trimmers or the 475 ohm resistors.


 

  Sound Lab Rev 002 PC Board (Alternate configuration)


The diagram shows how to connect the bases of Q1 and Q2 for mod or no mod. If installing the mod then install the 100 ohm trimmers or the 475 ohm resistors as shown below in the holes provided. Alternate rev 002 configuration boards do not have legend markings for the mod.

 

Sound Lab Bottom Copper Rev 001

Sound Lab Parts Layout Rev 001

The diagram on the main page will still apply regarding board to front panel connections.