[TechAssist] TIP: Increasing Cordless Phone Volume
- From: William E Miller <prototech@xxxxxxx>
- To: <repair@xxxxxxxxxxxxxxx>, <techassist@xxxxxxxxxxxxx>
- Date: Wed, 11 Jan 2006 14:45:41 -0500
(pardon if my messages get truncated - can't help it!)
Sony SPP-Q120 - How to Increase Volume (cordless phone)
Sure, this is an old model, but these principles should apply to increasi=
ng
the volume on many brands and models of cordless telephones. A little
experimentation should work. Have fun.
The SPP-Q110 (similar to SPP-110 & SPP-120) uses a Toshiba TB31223F IC to=
process audio, and that IC is similar to the TB31224F, which the SPP-110
uses.
Pin numbers & values may vary, but here's how I fixed mine:
I followed the traces from the speaker connector back to the IC. Positive=
goes
to pin 20, and negative goes to pin 18.
Coming out of pin 17 is capacitor C110 (.047uF) and that connects to resi=
stor
R113 (22K) which then connects to pin 18, comprising the gain control for=
the
audio output amplifier.
I simply changed R113 from 22K to 6.8K and that did the trick.
I used a 1/6th-watt leaded resistor and had plenty of headroom to mount i=
t
vertically (upright) with the leads snipped about 1/16" long.
You can download the schematic for the SPP-110 schematic here:
http://www.eserviceinfo.com/download.php?fileid=3D12012
The SPP-110 schematic shows a volume control switch, which the SPP-Q120 d=
oes
not have. Looking at that, it was easy to reverse engineer.
This phone was just too quiet, so I had to make it louder. Sounds great n=
ow.
Keywords SPP-Q110 SPP-Q120 SPPQ110 SPPQ120 SPP-110 SPP-120 SPP110 SPP120
William E. Miller, ASEET
prototech@xxxxxxx
Indiana USA
-----------------------------------------------------------------------------
This Email List is accessible to the general public through search engines.
Remove: http://www.tech-assist.org/remove.htm
Set Vacation mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
Lost Password: http://www.tech-assist.org and select "Login Problems?".
Email Archives: //www.freelists.org/archives/techassist/
Other related posts:
- » [TechAssist] TIP: Increasing Cordless Phone Volume
