Need help with charging system for battery powered Gainclone

jmillerdoc · 19th April 2011, 08:15 PM

Hi,
I just picked up 4 12v 7mA/h for $7 each at Tanner's in Dallas (heck of a bargain but he doesn't ship).

I have always wanted to cobble together a battery powered gainclone but one thing has stumped me. I want to build it where when I throw one switch it turns off the amp and starts charging the batteries.

Has anyone seen something like this built and know where I might find a wiring diagram on how this might be achieved? I have a few ideas but it requires a few switches to get the job done.

I bought a nice little floating trickle charger I thought I might be able to use for this.

Please let me know if you've seen this done or have any good ideas on how to make the charging system work like I've described.
Thanks,
Jeff

Arty · 20th April 2011, 06:10 PM

yes, i did make a similar design.
I used a premade battery charger with overcharge protection.
I used a set of relays to connect the batteries when the amp is off in paralell, then to the charger, and turn the charger on.
When the amp was on, the charger got disconnected from the batteries, and the batteries have been connected in series to get the voltage i need.
Last relay got connected to the series connect batteries, this turned on the amplifier it self.
It would only turn it on if there was at least 24 volts of total supply voltage.

Johnny2Bad · 07:37 PM

I've used a CTEK 3300 smart charger (lead acid batteries, sealed LA, Absorbed Glass Matt LA) with a 12V chip amp (TA2024) and lead-acid battery for a while. The CTEK is a bit expensive (around $60~80) but works very well, even with it in-circuit the amp sounds fine. I had planned to use it just for test purposes so didn't bother switching it in/out, but was pleasantly surprised at how well it worked. Ripple on the 3300 is spec'd at > 100 mV. Made in Sweden.
http://smartercharger.com/

A simple off (no power) /standby (charge) /on (battery only) switch would not be too tough to figure out.

jmillerdoc · 22nd April 2011, 06:35 AM

Arty,
Do you have a diagram of how you did this?

19th April 2011, 08:15 PM	#1
jmillerdoc diyAudio Member Join Date: Mar 2009 Location: Lawton, OK, USA	Need help with charging system for battery powered Gainclone Hi, I just picked up 4 12v 7mA/h for $7 each at Tanner's in Dallas (heck of a bargain but he doesn't ship). I have always wanted to cobble together a battery powered gainclone but one thing has stumped me. I want to build it where when I throw one switch it turns off the amp and starts charging the batteries. Has anyone seen something like this built and know where I might find a wiring diagram on how this might be achieved? I have a few ideas but it requires a few switches to get the job done. I bought a nice little floating trickle charger I thought I might be able to use for this. Please let me know if you've seen this done or have any good ideas on how to make the charging system work like I've described. Thanks, Jeff

20th April 2011, 07:31 PM	#3
Johnny2Bad diyAudio Member Join Date: May 2010	I've used a CTEK 3300 smart charger (lead acid batteries, sealed LA, Absorbed Glass Matt LA) with a 12V chip amp (TA2024) and lead-acid battery for a while. The CTEK is a bit expensive (around $60~80) but works very well, even with it in-circuit the amp sounds fine. I had planned to use it just for test purposes so didn't bother switching it in/out, but was pleasantly surprised at how well it worked. Ripple on the 3300 is spec'd at > 100 mV. Made in Sweden. http://smartercharger.com/ A simple off (no power) /standby (charge) /on (battery only) switch would not be too tough to figure out. __________________ " ... In theory, there is no difference between theory and practice; In practice, there is. ..." - Chuck Reid Last edited by Johnny2Bad; 20th April 2011 at 07:37 PM.

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20th April 2011, 06:10 PM	#2
Arty diyAudio Member Join Date: Feb 2011	yes, i did make a similar design. I used a premade battery charger with overcharge protection. I used a set of relays to connect the batteries when the amp is off in paralell, then to the charger, and turn the charger on. When the amp was on, the charger got disconnected from the batteries, and the batteries have been connected in series to get the voltage i need. Last relay got connected to the series connect batteries, this turned on the amplifier it self. It would only turn it on if there was at least 24 volts of total supply voltage.

22nd April 2011, 06:35 AM	#4
jmillerdoc diyAudio Member Join Date: Mar 2009 Location: Lawton, OK, USA	Arty, Do you have a diagram of how you did this?

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