Alecto garden speaker mod

Show or discuss your existing Home automation project here, so a detailed explanation!.....

Alecto garden speaker mod

Postby AshaiRey » Thu Apr 28, 2016 9:32 am

Here's an item from my site about a simple mod of an Alecto garden speaker.

Image
For some time now i got this garden speaker set. They survive an occasional rain shower and the sound is oke. I've hooked them up to my domotica system to stream music and announcements to them. However they have a big downside and that is that when you switch them OFF and ON again they reset. This means you can't use motion detection to turn the speaker on because they reset to default settings. The only way is to keep them powered on all the time. The thing is when you plug them in you have to press the ON button. Then you have to press the volume UP button several times because the volume defaults also to the lowest level. To solve this I was thinking of adding an ATTiny to the buttons to simulate keypresses at power up but it didn't feel right, to much over engineered.

Image
So what do i want?
I want the speaker turned on when the power goes on and retain the previous sound level when turned off. Nothing more then that. Waterwheel
The power on button controls a relay on the PCB to switch the power to the rest of the board. I made a wire bridge over the relay contacts and now the speaker goes on when power goes on, great! Step one ticked off.

Image
Next the volume problem. The whole volume control is done by one IC (PTC5266). So audio is going into the chip at 0db. Some magic happens in the chip and the audio comes out at a lower level again and is send to the amplifier.
Waterwheel
So why not by pass the chip?
I soldered 2 wires to the PCB. One at audio IN and one at audio OUT and connected a potentiometer to the wires. Now the audio input is directly connected to audio OUT (which goes to the amplifier) and the volume can be preset with the potentiometer.
Job done. Works just as planned now.
Bram
AshaiRey
Senior Member
Senior Member
 
Posts: 1297
Joined: February 2009
Location: Netherlands

Re: Alecto garden speaker mod

Postby esschenk » Thu Apr 28, 2016 5:01 pm

Nice project

Ed
User avatar
esschenk
Member
Member
 
Posts: 421
Joined: February 2008
Location: Netherlands


Return to Home Automation Projects

Who is online

Users browsing this forum: No registered users and 1 guest