DIY : Mini Variable voltage power supply

Homemade mini power supply, ideal for testing leds, motors and other electronics:
Dual Meter : http://bit.ly/2u6Uykx
or http://bit.ly/2T8ItVK
DC module : https://goo.gl/XPGaXg
or https://goo.gl/ZsEU1N
4mm jack : https://goo.gl/93L5mm
10k Potentiometer : https://goo.gl/6FzL4X
or https://goo.gl/uqZDMe

or
10k precision potentiometer: https://goo.gl/oq6SrG
or https://goo.gl/SyZ4Qo
Multi charger https://goo.gl/RzrCf8
or http://bit.ly/2GIQ09Z

- Schematic at 2:29

1º-Power the DC Step-Down module ​using a transformer from 4 to 30 volt, conect the amp meter to the source "in"
2º-The yellow wire is pluged to the "out" positive side of the buck converter
3º-The remaining bigger black wire is conected to the "out" negative side, the the red is the output negative

Instructions :https://www.instructables.com/id/Mini-Variable-Power-Supply/
Specs :
- Input: DC 3 - 40V (input voltage must be higher than the output voltage to 1.5v above can not boost)
- Output: DC 1.5 - 35V (continuously adjustable)
- Current: 3A (Max.)
- Built-in SANYO fixed capacitor

Specification Supply voltage: 4.5~30V; Measuring current: 10A
Features Dual-display digital current and voltage meter
Application With five wiring, easy to access to car / battery car / motorcycle car lines, used to monitor the battery voltage, battery voltage status grasp, can also be used for other products voltage and current measurement purposes
Other Supply voltage: 4.5~30V; Test voltage: 0~100V
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