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'''Why have JP1 & JP2?'''
The VBAT voltage range of CM3 is 2.5-5V. The , and the VBAT voltage of most CM3 IO boards is 3.3V or 5V, but the VBA voltage of CM4 is only 5V. When the VBAT of the CM3 IO board used is 3.3V, a DC circuit is needed; but if the VBAT of the CM3 IO board is 5V, the DC voltage will produce howling because it does not need to be boosted;
Please shorten JP1 only for CM3 IO board with VBAT voltage less than 5V, or shorten JP2 only for CM3 IO board with VBAT volgate of 5V;
[[File:IMG-2656-jumper-desc-1.jpg|700px|CM4 to CM3 adapter]]
[[File:CM3.jpg|CM3 VBAT voltage]]