The polarity (+/-) is not drawn on the board supplied, nor does it help that the circuit supplied does not exactly match that in the photo. On the other hand, connect it to the inputs (+/-) as shown in the photo and everything will work fine. Feels quite warm but not hot when 5V/1.3A is applied to my phone. I didn't connect it to an oscilloscope to measure ripple, just a simple USB hub with a built in meter.
Portable Electric Vehicle Charger (40A, 240V, 25Ft Cable) - Level 2 EV Charging Station With NEMA 6-50P Plug-In For EVs By MUSTART
19 Review
OEMTOOLS 24397 2.5 Gallon Manual Fluid Extractor Pump For Oil And Transmissions, With Oversized Handle For Easier Use And Extraction
23 Review
MUSTART Level 2 EV Charger With 240V, 25Ft Cable, And Adjustable Amps (16/25/32) – Portable Electric Vehicle Charging Station With Delay Function And NEMA 14-50P Plug-In
29 Review
Efficient And Convenient EV Charging With MUSTART Level 2 Portable Charger (240V, 25Ft Cable, 25Amp)
18 Review
Xiaomi Mi x Mijia Wiha Precision Screwdriver Set (DZN4000CN), 25 pcs
34 Review
Reversible Mi 16-in-1 Ratchet Screwdriver
21 Review
Bit and socket set Stels Tool set, 1/2", 1/4", CrV, plastic case 94 pcs, Stels, 94 pcs, black
46 Review
Rechargeable screwdriver OA-3,6F (433.0.2.00), 3.6 V, 1.3 Ah Li-ion, blister
46 Review