DIY KIT Project
To complete this project, high level knowledge of electronics and rich experience in terms of soldering and testing are required.
Due to time zone and language communication restrictions, we can only provide limited technical support, and you need to solve problems by yourself.
We do not provide information other than the product introduction page.
MOFI- Fully Discrete Par allel A Regulated Power Supply (Dual Rail±5V ～±80V) DIY KIT
All-discrete topology
Single-pass, series regulator design.
No IC (integrated circuits) are used.
Low noise, high PSRR.
A long-tailed pair differential amplifier with current mirror and constant current source forms the first stage of the error amplifier.
The second stage is the voltage amplification stage (VAS), also with constant current source load.
Onboard heatsinks can be used which would allow to supply up to 0.3A continuous
More sustained currents are possible by using larger, offboard heatsinks.
Typical output voltages are ±5V, ±9V, ±10V, ±12V, ±15V, ±18V, ±24V, ±27V, ±30V , ±36V. ±48V,±60V,or±80V
Typical Application
Input voltage VAC= (Output voltage +8)/1.414
For example:
±12VDC-OUT,
Input voltage VAC=（12+8)/1.414=14.14VAC, Please choose Dual 15VAC
±5VDC-OUT Dual 9VAC-IN
±9VD-COUT Dual 12VAC-IN
±12VDC-OUT Dual 15VAC-IN
±15VDC-OUT Dual 18VAC-IN
±18VDC-OUT Dual 18VAC-IN
±24VDC-OUT Dual 22-24VAC-IN
±30VDC-OUT Dual 26-28VAC-IN
±36VDC-OUT Dual 32VAC-IN
±48VDC-OUT Dual 40VAC-IN
±60VDC-OUT Dual 48VAC-IN
±80VDC-OUT Dual 62VAC-IN
Quiescent current setting
Quiescent current= Load current*1.4
R1=0.65/ Quiescent current
For example:
Load current=0.09A;
Quiescent current=0.09*1.4=0.126
R1=0.65/0.126=5.1R
There are two R1 position on the PCB, you can choose to install two 10R or one 5R resisto.
Do not short the output terminal to discharge capacitor, otherwise it will damage the power board.
Product configuration
DIY kit: Contains the PCB and the components needed on the PCB, but does not include the power transformer .
Finished board: Based on the well-tested board on the standard version kit, we verified all key points' voltage, and used the signal generator and oscilloscope for analog waveform double verification. We will not use this board for listening test.
The default quiescent current of the finished board is 0.125A
If you need other voltages, please contact us.
All finished pcbs are all carefully hand-soldered and fully tests, so the price is higher and less cost performance. Price-sensitive consumers but with have DIY ability are recommended to choose the kit.
Schematic
PCB comes with component parameters for easy installation.
We only refer the schematic of the amplification part of the circuit. If you need full circuit parameter, please read the component value with the PCB by yourself; we do not provide additionally.
DIY KIT Instructions
Since the PCB holes are plated through, you only need to solder the parts from the bottom of the board. Do not drill or enlarge the holes because that would damage the through-plating.
Clean both sides of the blank PCB with paper towel and isopropyl alcohol or electronics flux remover, then solder the components to the board, starting with the lowest profile parts. This means the resistors and zener diode. Then solder the small capacitors, small transistors, followed by the larger capacitors.
Make sure the correct part goes into each position on the circuit board. Measure each resistor with your multimeter to ensure it's the proper value.
Pay attention to the polarity of electrolytic capacitors, diodes, , transistors as well as the orientation.
Clean up the solder flux residue from the board with isopropyl alcohol (or electronics flux remover) and a brush.
Inspect all solder connections carefully, using a magnifying glass, to make sure there are no solder bridges or cold solder joints. Use a multimeter in ohms scale to check for short circuits.
Parts list
