TM79 Assembly Guide
Damaged or Missing Parts All kits and parts are checked before being shipped to you. If something arrives damaged or if your kit is missing a part, please open a support ticket to inquire about a replacement. Missing parts will be replaced at our expense. Damaged parts should be returned for verification. If the part shows signs of use beyond what was necessary to determine that it was damaged, DIY Recording Equipment, LLC reserves the right not to replace the part.
You'll need the tools below to complete this build.
We recommend an adjustable-temperature station, such as the $40 Weller WLC100.
You can use 60/40 "leaded" solder or lead-free. We recommend 60/40 because it flows better and is easier for beginners to use.
You'll need a pair of good "snips" for cutting of the excess leads after soldering.
These tools aren't strictly necessary but can make your build a bit easier.
If you find the color bands on resistors a bit hard to read, you can use a meter to sort them with absolute confidence.
If you accidentally solder something in the wrong place, a desoldering pump can save the day.
0. Resistor Calculator
Type in the value of the resistor you need and this tool will show you the corresponding color code.
Before you begin soldering, identify and sort each component using the Component Sorting Sheet (PDF).
|R2, R3, R6, R14||220k||Resistor, 1/4W, metal-film||4|
|R7, R9||10k||Resistor, 1/4W, metal-film||2|
|R10||68R||Resistor, 1/4W, metal-film||1|
|R4, R5||82R||Resistor, 1/4W, metal-film||2|
|R12||750R||Resistor, 1/4W, metal-film||1|
|R11||910R||Resistor, 1/4W, metal-film||1|
|R13||3k||Resistor, 1/4W, metal-film||1|
|R8||5.1k||Resistor, 1/4W, metal-film||1|
|-||Standoff||Nylon, press-fit, 1/8"||4|
|C1, C2||.1u||Capacitor, film||2|
|C5, C9||47u||Capacitor, electrolytic||2|
|C3, C4||100u||Capacitor, electrolytic||2|
Standoffs and Connector
Insert and Bend Resistor Leads
Solder and Trim Resistors
Populate Remaining Components
- U1 (opamp), C7 (yellow, note that the actual value is "22p" not "33p" as marked on the PCB)
- C1, C2, C6, C8 (box capacitors), Q1, Q2 (transistors)
- C3, C4, C5, C9 (electrolytic capacitors), T1, T2 (transformers)
Before you wrap up, check the following things:
All good? Congrats on finishing your build! Have a question or problem? Drop us a line.