# HG changeset patch
# User Mychaela Falconia <falcon@freecalypso.org>
# Date 1623787025 0
# Node ID 153b517ccc7a13ea7ae294859501f78bf4a92349
# Parent  6b02de9262774717f76867b000c863b3d6b42a24
FC-handset-spec section 1.7.2: make contrast with MIDI ringtone chips

diff -r 6b02de926277 -r 153b517ccc7a FC-handset-spec
--- a/FC-handset-spec	Tue Jun 15 19:28:52 2021 +0000
+++ b/FC-handset-spec	Tue Jun 15 19:57:05 2021 +0000
@@ -516,10 +516,12 @@
 1.7.2. Loudspeaker implementation
 
 The external amplifier chip for driving the 8 ohm loudspeaker will be TI
-TPA6203A1, copied from Leonardo schematics and proven good on FCDEV3B.  On
-FCDEV3B this amplifier is fed with signal from Iota EAR output, but on the final
-handset and on the Venus development board this amplifier will be fed with
-signal from Iota AUX output instead.
+TPA6203A1, copied from Leonardo schematics and proven good on FCDEV3B.  It is a
+"dumb" loudspeaker amplifier, as opposed to a much more complex chip that
+combines the loudspeaker amplifier function with a MIDI ringtone player - see
+section 1.8.  On FCDEV3B this amplifier is fed with signal from Iota EAR output,
+but on the final handset and on the Venus development board this amplifier will
+be fed with signal from Iota AUX output instead.
 
 The loudspeaker amplifier has an on/off control by way of a Calypso GPIO; in
 order to save battery, this amplifier needs to be off normally, and only turn on