Ok so somewhere in my mad ravings I came up with this idea for simply controlling the power for my portable-boombox-project-in-progress and was wondering if it would work as I thought. For details sake you can find info about the amp here:
www.41hz.com/main.aspx?pageID=118 and the charging circuit here:
12V powered, 12 V battery charger
Basically, I want to be able to power the amplifier either by 12v battery or 12v ac-dc adapter and also to be able to charge the battery using the same adaptor (hence the 12v powered 12v battery charging circuit).
As far as I can see, this achieves that as it allows me to power the amp when batteries are required, and then when wall power is available, I can play and charge at the same time, or only play if I choose so.
The dc socket is the type that has a terminal that breaks when an adapter is plugged in.
The dpdt switch connects the battery to either the charging circuit or the dc jack and I would likely use a centre off switch so it would be play-off-charge.
By the way, the charging circuit has diodes to stop wrong current flow, so I've just pointed that out with a diode symbol.
On the schematic (I really would hesitate to call it that
) I've written what the result is of each combination of battery/ac-dc and switch.
So, pretty much it would be good if I could get peoples' opinions on whether this would work, or perhaps improvements to it (if I could achieve what I outlined above without using a switch that would be great)
**broken link removed**