Modify the outdoor power supply

How do I stabilize the output voltage?

The stabilization of the output voltage is done using a TL431. This is a shunt regulator with a refence voltage and an input pin to adjust the output voltage. The data sheet of this device can be found on the internet. I located the resistors that are responsible to set the output voltage. They are named R10 and R14 on the pcb.

What is an SMPS power supply?

SMPS stands for switch mode power supply. It's the modern and most compact/efficient way of acquiring low voltage DC from mains AC source.

How can you change the output voltage?

The output voltage can be changed by changing the resistors in the programmable shunt device. This shunt regulator is the component which fixes the feedback voltage to the AC section mosfet and in turn determines the output voltage.

How SMPs can be made into a variable power supply?

This post explores a method to convert any SMPS into a variable power supply capable of outputting any desired voltage level from 0 to its maximum. The design employs a shunt regulator circuit stage to achieve the variable voltage feature.

Why is SMPS more efficient than traditional power supply units?

SMPS is more efficient than traditional power supply units using iron core transformers because it's the modern and most compact way of acquiring low voltage DC from mains AC source. However making an SMPS at home may not be as simple as making power supply units using traditional iron core transformers.

Are there any off-the-shelf switchmode supplies available?

However, there are no off-the-shelf supplies available with that output voltage. Fortunately, there is no shortage of inexpensive Chinese switchmode supplies with standard outputs of 5,12,24V etc. Most (all?) of these have the ability to adjust the output voltage slightly, by around ±10%.