Hearing aid

tabbypurr · 2018-12-11T23:15:17+00:00

Contemplating the possibility maybe of doing a very low cost hearing aid. But it's not something I've designed before. The musts: Use mass market off the shelf parts, so it will necessarily be large Decent battery life to keep costs down, not like the cheapskate ones you can get that only run a few days on coin cells. Using AAA or AA is possible. If a chip is used it must be a very common one - and I can't think of one that would do this. The 386 has min 4-5v, Iq 4-8mA, hardly ideal, not totally ruling it out but don't love it. So it's either a 386, which would use a massive 4 cell battery pack. AAA 0.3-0.5Ah at 8mA = 50 hours, and that's just I_q. No use at all. Which leaves only discrete designs left. And I lack experience with very low voltage amp design or with sliding class A. Suggestions welcome... and not pursuing it remains an option. NT

Dec 11, 2018 80 Replies

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<698839253X6D445TD 7 years ago

Martin Brown wondered

BT stands for blue-tooth in this context.

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