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Here are the build instructions for the Muffsy Hifi Dual Power Supply v4.
The picture below is a larger version of your printed circuit board. For each step, this will be used to highlight which components you will be adding to the board.
You will also get a live view of where you are in the build process. It will show you what each component looks like, and present special information if needed.
These are the components needed to build the power supply.
|1||Printed circuit board - Muffsy RHPS-6|
|2||Resistors, 0.25W Metal Film, 300 ohm|
|2||Resistors, 0.25W Metal Film, 3300 ohm|
|2||Resistors, 1W, 4.7 ohm|
|6||Ceramic Capacitors, 100 nF|
|2||Electrolytic Capacitors, 25V or higher, 10 uF|
|1||Electrolytic Capacitor 35V or higher, 470uF |
(Grid: 5.8 mm, Diameter: 10 mm)
|4||Electrolytic Capacitors, 35V or higher, 2200 uF |
(Grid: 7.5 mm, Diameter: 16 mm)
|1||Voltage Regulator, LM317T|
|1||Voltage Regulator, LM337T|
|1||Voltage Regulator, LM7815|
Screw Terminal, DG301, 2 Positions
(Grid: 5 mm)
|1||Wall Adapter, 15-18V AC |
There are eight 1N4004 diodes on the board. Take your time and make sure you have them oriented correctly. The silver band on each diode matches the symbol on the printed circuit board.
Before you continue, consider if you want to change the output voltage. The Muffsy kits are made for +/-15V (which is what you get if you use the included components), but you may have other plans for the power supply. If you plan to use other operational amplifiers, check what their maximum voltage is. Some may need less voltage.
There are four of the 0.25W resistors, they can be oriented whichever way you want. It is a good idea to measure them before they are soldered in place.
The two 1W resistors can be mounted either way.
The resistors may look small for a 1W model, that's because they are Vishay PR-01 metal film resistors (pdf). Do not attempt to replace them with resistors that have a lower power rating.
Next you've got six ceramic capacitors to place on the board. The orientation does not matter for these, but I like to place them so that the text is outwards and visible.
These two capacitors must be mounted the right way around. The white band (the negative side of the capacitors) are pointed upwards on the board. See the pictures below for reference.
The board has three voltage regulators. One for +15V, one for -15V and a third one for +15V AUX power. They are three different models, make sure you identify them as LM317, LM337 and LM7815.
It's important to get both the placement and the orientation of the voltage regulators correct. If you're unsure how to mount them, there are pictures taken from two different angles below.
The orientation of this capacitor is important, place it as on the pictures below and solder it in place.
There are four large 2200 uF electrolytic capacitors on the board, for smoothing the rectified AC voltage.
Orientation is important, all the white bands are facing downwards. Double check the orientation before you solder these capacitors in place, they can be pretty hard to desolder.
Solder the three position screw terminal in place. It is for the +/- 15V DC output, and not for the "AUX GND LED".
Make sure the openings in the screw terminal faces outwards.