Page 6 of 8
Assembly instructions
This design is very easy to build. . You can solder the parts in the order you'll like but it may be practical to start with all low parts such as resistors and then take higher parts.
Start with all low parts except for the output power amp and the opamp.
- Opamp if it's a SMD type. It's hard to solder if you have any parts around the opamp.
- Resistors, jumpers
- Zener diodes
- Diodes. Notice that the diodes, D9-D12, near the opamps are mounted in a special way, see the photo. They are standing up. Be careful when you bend of of the legs.
- Plastic capacitors
- Transistors, voltage reference. Fat outline = LM431. Thin outline = LM329 or other 2-pin devices.
- LED
- Trim pot (if you use it)
- Capacitors, elelctrolytic
- Regulator, power transistor. Mount them first in the heatsink, then solder them. You won't need any insulation between the semiconductor and the heatsink but heat compund may be used to increase the heat transfer. Pay also attention to that the heatsink isn't in touch with the groundplane. Solder the heatsink into the pcb when you see that everything is working.
- Connectors
Besides from these instructions the regulator is pretty easy to build but pay attention how you should mount all polarized parts. See pictures below and also the pdf file. In the pdf file I have made placement pictures with extra clear markings for each part. Print it and have it beside you when you solder.
Detail of the positive half
Click on the picture to get a larger view.
Parts for ± 15 volts out using LM431
Detail of the negative half
Click on the picture to get a larger view.
Parts for ± 15 volts out using LM431
