neutral labs SCRAT v1.1 Instruction Manual

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SCRAT v1.1

by neutral labs

Build Guide

Important!

DO NOT EMPTY ANY OF THE COMPONENT BAGS NOW! The components are grouped

into the bags so that all of them can be identified without having to

look up resistor ring codes or inspect diodes with a loupe. Rather

leave everything inside the bags and take out what you need while

soldering. This way you will not have to use resistor ring codes or a

multimeter to determine the values.

Table of Contents

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Summary of Contents for neutral labs SCRAT v1.1

Page 1 SCRAT v1.1 by neutral labs Build Guide Important! DO NOT EMPTY ANY OF THE COMPONENT BAGS NOW! The components are grouped into the bags so that all of them can be identified without having to look up resistor ring codes or inspect diodes with a loupe. Rather leave everything inside the bags and take out what you need while soldering.
Page 2 Component List Part Count Type Polarity matters? C1-C4 electrolytic capacitor 0.1 µF C5-C6 ceramic capacitor 3.3 nF C7-C9 electrolytic capacitor 10 µF BAT85 Schottky diode D1-D4 1N4148 signal diode D5-D6 LED orange 3 mm Thonkiconn mono 3.5 mm switching jack J1-J4 5-pin header (panel port) J5-J6...
Page 3 Step-by-step instructions Solder diodes D1-D6 (except D7!) resistors first (R1-R23). You do NOT have to read ring codes or use a multimeter to determine the resistor values. Neither do you have to use a loupe to inspect the labels on the diodes. There are only unique sets, so you can just count the ones in each set to find out the value.
Page 4 Next, put in the IC sockets (U1 and OK1-OK2). They have a little notch on one side which should match the notch of the white outline on the PCB. (It’s not harmful if you put one in the other way around by accident, as long as you make sure the IC is facing the right way when you plug it in later.) An easy way to solder these sockets is to set them into the PCB...
Page 5 Put in the small 3.3 nF capacitors next (C5-C6, polarity does not matter for them). In your kit, C5 and C6 may be different in size, shape and/or color from the ones shown here. Don’t worry, ceramic capacitors come in different designs, but they work the same way. Add the J175 JFET (Q1).
Page 6 Flip the PCB over. Now on to J5 and J6 (the panel port headers). There are 2 different types of DIY kits with different types of headers. If your kit has headers with long legs that look like this, skip the next step. If your kit has two 5-pin precision headers with round holes and short legs, put them into J5 and J6 as shown and solder them.
Page 7 In case your kit has these 5-pin precision headers, it will also have a regular 19-pin or 20-pin female header strip (with short legs). Otherwise it will have two 5-pin headers with long legs. Unless you have two individual 5-pin headers already, break two 5-pin wide pieces from the longer header strip, you will need them for the front panel ports.
Page 8 Plug the ICs into their sockets (U1 and OK1-OK2). They have little notches or dots on them, which should match the little notch on the socket (and the notch in the white outline on the PCB). Bend their legs slightly inward if you have trouble fitting them in. Now plug in and test your module.