Since there is no adjustable power supply, it is very troublesome during the usual production and testing, so I can find power everywhere. No, I finally bought what I needed. I have been making my own mini adjustable power supply these days. The power supply uses the LM2596 module, which is claimed to have a maximum current of 3A. After testing, there is no problem under low power. Original required: 1. 17V transformer·······X 1 2. DC005 plug······X 1 3. Mains plug···········X 1 4. 1N4007···········X 4 5. Cardboard··················X 1 6. The right box······X1 Note: The above can be replaced by a finished power supply 7. The box you think is suitable X1 8. Voltmeter head X1 9. LM2596 module X1 10. DC005 socket X1 11. Terminal X1 Start my production below: After testing, the LM2596 module is only slightly higher than the room temperature and the temperature of the transformer is not high after working for 5 minutes at the maximum power of 3W. In the future, you can also consider changing the power supply to high-power or even putting it in an adjustable power supply box. It is the voltmeter head, because there is a linear voltage regulator circuit inside, it is very hot, and the lower the input voltage, the lower the heat. Gain Chip,Gain Chip Laser,Narrow Linewidth Laser Diode ,Single Spatial Mode Laser Diodes AcePhotonics Co.,Ltd. , https://www.acephotonics.com