As a regular power supply 12 to remake in a laboratory adjustable power supply 3-25 V

It is not necessary to buy an expensive adjustable power supply for a home laboratory. It can be simply made from the available 12 volt pulse adapter. Blocks are suitable even on 9 and 6 volts, the only maximum output voltage can slightly decrease. All alteration of the block diagram will be expressed in a small replacement of components.

Need

• Amploltmeter - http://alii.pub/5m5n02.
• Potentiometer 10 comes http://alii.pub/5m5ncw
• Terminals - http://alii.pub/5m5nij.
• Plastic case - http://alii.pub/5m5npj
• TL431 stabilizer microcircuit - http://alii.pub/5mclsi
• Resistor 1 com - http://alii.pub/5h6ouv

What do you need to replace in the diagram?

We will analyze the body of the power supply of the extraction board.

Stabilization adjustment is carried out by feedback through the optocoupler. In the circuit of which there is a stabilion that is just responsible for a stable output voltage of 12 V.

We need to drop it and replace it with an adjustable stabilion made on the TL431 stabilizer chip.

That's all, after that it will be possible using an alternating resistor to set any desired voltage.

If you decide to remake your block, and in it instead of Stabitron already costs TL431, then how to remake the following scheme here - https://sdelaysam-svoimirukami.ru/7178-kak-sdelat-blok-pitanija-regulirumym-3-25- v.html

How from block 12 in make an adjustable power supply

[List]

We take the chip TL431 and the shape of her contacts.

We hit the fee.

Drop the resistor 1 com to the nearest overall wire. In this model, an empty space under the capacitor.

We solder wires to the potentiometer.

We connect its contacts to the secession.

The housing is made on a 3D printer. He is simple, it can be done without high technologies, let's say, how is it here - https://sdelaysam-svoimirukami.ru/7377-zarjadnoe-ustrojstvo-pristavka-k-adapteru-noutbuka.html

Install all components.

We solder to the petals of the wires running from the board and screw to the terminals.

The ampervoltmeter will not work from voltage 3 V. Therefore, for it another block from a low-power source is taken.

We install fees in the housing.

We close the lid, fix the screws.

Checking work.

The output voltage is easily adjusted in the range of 3-25 V. What, of own, even very good. Check on the real load.

To power the laboratory homemakes it is quite useful.

Watch the video