TripleRegulated EI38 supply – mounting instructions
This page contains the mounting instructions for the TripleRegulated EI38 supply. Assuming, you have bought this power supply pcb or kit, now the fun of mounting starts! Make sure you read the complete instructions before you start mounting. Assembling can be done by an experienced hobbyist in about one hour.
List of components
Please check if the list is complete. The kit should have the following components, if you bought the pcb, these components are suggested (or choose your own):
| Qty | Value | Device | Parts |
| 2 | 2-pin | Con-pcb-5.08 | DOUT |
| 2 | 3-pin | Con-pcb-5.08 | AOUT |
| 8 | 10nF | C-multi | C1, C4, C7, C8, C15, C16, C17, C18 |
| 6 | 100nF | C-multi | C10, C11, C12, C13, C21, C23 |
| 3 | 22uF | C-elec-7mm | C14, C20, C22 |
| 3 | 2200uF/25 | C-elec-13mm | C2, C3, C9 |
| 1 | 2-pin | Con-pcb-7.62 | AC |
| 8 | 1N5158 | DIODE | D1, D2, D3, D4, D5, D6, D7, D8 |
| 2 | EI38 | Transformer | TR1 (12VAC), TR2 (7.5VAC) |
| 3 | 3mm | LED | LED1, LED2, LED3 |
| 2 | LM317 | Regulator | IC3, IC4 |
| 1 | LM337 | Regulator | IC2 |
| 3 | 270 | R-0207 | R2, R4, R5 |
| 1 | 820 | R-0207 | R6 (5V DOUT, others see schematic) |
| 3 | 1k | R-0207 | R7, R8, R9 |
| 2 | 2k2 | R-0207 | R1, R3 (12V AOUT, others see schematic) |
| 1 | 160mA | Fuse+holder | F1 |
Tools
Required:
- Soldering iron and solder
- Multi-meter (voltage and resistance)
- Side-cutting pliers
Recommended:
- Adjustable dual power supply
Mounting
The easiest way of mounting is by starting with the components with the lowest height and build up the PCB in steps, where components of the same height are fitted and soldered in each step. So, solder in this order: resistors, diodes, multilayer capacitors, connectors, regulators, fuse, electrolytic capacitors, transformers.
Always double check all components before you solder them (especially the ones that are polarity dependent, diodes, electrolytic capacitors, etc), as it is difficult to remove them after soldering, much more time consuming and may break components or PCB.
Hints
- The default transformers and value of R1, R3, R6 is for single 5V and dual 12V output. They can be simply changed if a different output voltage is desired (see the schematic and/or the LM317/LM337 datasheet). Suggested:
- 5V output, TR=7.5VAC, R=820 ohm
- 9V output, TR=9VAC, R=1k5 ohm
- 12V output, TR=12VAC, R=2k2 ohm
- 15V output, TR=14VAC, R=3k ohm
- Depending on the input voltage and current consumption, IC2, IC3 and IC4 might need to be connected to a heatsink!
Testing
- Double check that all components are mounted correctly before connecting the AC source
- After AC source has been applied, the different LEDS should light up to indicate presence of output voltage
- Measure the output voltage with a multi-meter
Schematic
