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 or 36V.
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 15VAC；
5VDC-OUT 9VAC-IN
9VDC-OUT 12VAC-IN
12VDC-OUT 15VAC-IN
15VDC-OUT 18VAC-IN
18VDC-OUT 18VAC-IN
24VDC-OUT 22-24VAC-IN
30VDC-OUT 26-28VAC-IN
36VDC-OUT 32VAC-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 resistor.
Do not short the output terminal to discharge capacitor, otherwise it will damage the power board.
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.
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
Pics
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