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


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.