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Herald1360 · 29th Apr 2019, 12:10 pm

Presumably the current draw issue is as relevant to the USB source capability as the LM317? Without a heatsink, a TO220 317 should be OK for about 300mA for 5V in and 1.5V out.

Edit: Looking at the likely module, it should be OK for about an amp with the 3.5V I/O differential. I would think for 1.5A it would need the I/O differential kept very close to the 317 dropout value!

29th Apr 2019, 12:10 pm	#5
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,535	Re: 1.5Volt supply Presumably the current draw issue is as relevant to the USB source capability as the LM317? Without a heatsink, a TO220 317 should be OK for about 300mA for 5V in and 1.5V out. Edit: Looking at the likely module, it should be OK for about an amp with the 3.5V I/O differential. I would think for 1.5A it would need the I/O differential kept very close to the 317 dropout value! __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O Last edited by Herald1360; 29th Apr 2019 at 12:19 pm.