From fe537b8bdf66e73cb7e1fdfe1891364f5b7b64e2 Mon Sep 17 00:00:00 2001 From: drowe67 Date: Tue, 30 Dec 2014 04:44:00 +0000 Subject: [PATCH] thoughts on using headphones to change log git-svn-id: https://svn.code.sf.net/p/freetel/code@1988 01035d8c-6547-0410-b346-abe4f91aad63 --- smartmic/SM1000-D/change-log-D.txt | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/smartmic/SM1000-D/change-log-D.txt b/smartmic/SM1000-D/change-log-D.txt index 7564ff01..3a4f9c25 100644 --- a/smartmic/SM1000-D/change-log-D.txt +++ b/smartmic/SM1000-D/change-log-D.txt @@ -24,4 +24,14 @@ 11. Microphone pins are swapped, ie rotate by 180 degrees. +12. Should R46 be log? + +13. With bud type headphones, a low volume leve is reqd. At these + levels some low freq noises at the frame rate and HF hiss can be + heard. As these noises are still heard with zero volume its + probably noise from U8. Might need soem HP/LP filtering. Thru + loudspeaker fine. Amount of noise varies with headphones used. As + volume is hard to regulate perhaps another option si a series + resistor with the headphone jack. + -- 2.25.1