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ELMYRA v1.4
by neutral labs
Build Guide
Congratulations on your decision to build the mighty Elmyra. Your life
will change forever due to this experience. If nothing else, you'll be
in possession of this wonderful machine that you likely did not
possess before. Unless, of course, this is not your first Elmyra
build, in which case I need to tell you that you are a great person.
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. Rather leave everything inside the bags
and take out what you need while soldering.
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Summary of Contents for neutral labs ELMYRA v1.4
- Page 1 ELMYRA v1.4 by neutral labs Build Guide Congratulations on your decision to build the mighty Elmyra. Your life will change forever due to this experience. If nothing else, you’ll be in possession of this wonderful machine that you likely did not possess before.
- Page 2 Panel First prepare the panel. Place the 4 LED sockets in the positions shown below and secure each one with the nut on the back. Now put in the 6 touchpads. You must use the plastic washers under the touchpads on the top side! On the bottom side, tighten the nut and do not use any washers.
- Page 3 The easiest way to solder this header is to first melt just a bit of solder on one of the 4 pads on the board. Then plug the female Dupont connector of one of the 4-pin cables into the header. This will make it easy to hold while soldering without burning your fingers.
- Page 4 R2, R17 kΩ Ω R3, R5, R7, R4, R6, R8, kΩ no You can substitute R18 for a lower value if you like the power LED to be brighter. Or for a higher value if you like it Ω. dimmer. Do not go below 50 R10, R11, kΩ...
- Page 5 Begin by soldering the resistors, diodes and IC socket. It helps to solder one pin first and ease it in place. Pay attention to polarity. Next solder the male header and all capacitors except for the 3 large ones (C1, C2, C3). Once more, polarity matters, except for C7! Then place C1, C2 and C3 into their place and solder.
- Page 6 Next, break and solder the male headers to the ItsyBitsy board on the bottom (unpopulated) side. DO NOT SOLDER THE ITSYBITSY DIRECTLY TO THE PCB! Then break the long female header strip apart as needed by making a small cut on both sides with a sharp knife and then snap it along the edge of your workbench.
- Page 7 Solder the female header pins on the other side. After soldering, unplug the ItsyBitsy board again. It should look like this: The bottom side is done. You can plug the MCP6002 in its socket now (check polarity!). PCB Top Side Now place all the components on the top side of the PCB according to the table below.
- Page 8 LED1 - LED3 orange LED yes The short leg towards the PCB top edge (flat side of the printed circle). LED4 blue LED yes The short leg towards the PCB bottom edge (flat side of the printed circle). Carefully place the panel on top of the PCB and wiggle it into position.
- Page 9 Now put the ItsyBitsy back in place. It’s not a good idea to put on and tighten all the nuts now. Better wait until everything else is complete, in case you need to troubleshoot. Connect Panel and PCB You can now connect the panel and PCB with the provided 4 pin Dupont cable.
- Page 10 Now solder the remaining Dupont cable to the 3 solder lugs as indicated in the picture below. Make sure there is no accidental solder connection between lugs. Also watch for loose strands of wire, especially between the 5V and GND inputs. A short in this location might damage your power supply.
- Page 11 Just for reference, the GND lug on the DC jack is pin 2 in the picture on the left and the 5V lug is pin 1. Leave the 3rd lug on the jack unconnected. Also for reference, the GND lug on the audio jacks is the one that connects to the sleeve of the plug, and the signal lug is the one that connects to the tip, as shown in the picture on the left.
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