I am using this battery charger to charge the 12V battery on my Tripath TA2024 powered portable boombox:
Duracell 2 Amp Battery Maintainer | Duracell
It is hooked via DC jack into the circuit where the battery is connected directly to the Tripath TA2024 amp.
My last amp died unexpectedly. I just replaced the amp and was getting ready to hook up the charger when I had a funny feeling. I pulled out my multimeter and read the output voltage on the Duracell battery charger... 19V !!!! WTF?
I thought this was a 12V Battery Charger? Is this why my other amp broke?
How do I charge the battery without frying the amp?
Thanks for your help.
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Duracell 2 Amp Battery Maintainer | Duracell
It is hooked via DC jack into the circuit where the battery is connected directly to the Tripath TA2024 amp.
My last amp died unexpectedly. I just replaced the amp and was getting ready to hook up the charger when I had a funny feeling. I pulled out my multimeter and read the output voltage on the Duracell battery charger... 19V !!!! WTF?
I thought this was a 12V Battery Charger? Is this why my other amp broke?
How do I charge the battery without frying the amp?
Thanks for your help.
>
These specs are right off of the Duracell website:
Output current 2 A
Output voltage (nominal):
Charge 14.4 Vdc
Float 13.0 Vdc
Equalize n/a
AC input voltage 115 V, 50/60 Hz
Inverter no-load current N/A
Inverter low-battery shutdown N/A
WTFF !!! ?!?!?!?!?
Sorry. I am frustrated.
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Output current 2 A
Output voltage (nominal):
Charge 14.4 Vdc
Float 13.0 Vdc
Equalize n/a
AC input voltage 115 V, 50/60 Hz
Inverter no-load current N/A
Inverter low-battery shutdown N/A
WTFF !!! ?!?!?!?!?
Sorry. I am frustrated.
>
Yes,In order for the battery to accept a charge the charging voltage must be higher than voltage from the battery taking the charge.
Also you should never use a battery charger as a power supply unless you have some sort of filtering device such as a battery or a large filter capacitor hooked to it.
I am not sure what the input voltage range is on the Tripath amp but I am suspecting that that the extreme ripple voltage may have been what killed it.
jer :/
Also you should never use a battery charger as a power supply unless you have some sort of filtering device such as a battery or a large filter capacitor hooked to it.
I am not sure what the input voltage range is on the Tripath amp but I am suspecting that that the extreme ripple voltage may have been what killed it.
jer :/
Those specs only hold with the charger connected to a good battery. It must never be connected to a load without a good battery in parallel. Severely deep cycling the battery, especially if it isn't in great shape, could also allow the terminal voltage to temporarily rise too high when the charger is applied.
Also the spike caused when you hooked up the charger to the battery could have been high enough to take out the amp as well.
This is the same thing as too why you should have both vehicles off when you connect a set of jumper cables to both batteries.
When a large current causes an arc they also cause High Voltage spikes and it sometimes takes out the computer or other devices causing costly electronic repairs in vehicles.
jer 🙂
This is the same thing as too why you should have both vehicles off when you connect a set of jumper cables to both batteries.
When a large current causes an arc they also cause High Voltage spikes and it sometimes takes out the computer or other devices causing costly electronic repairs in vehicles.
jer 🙂
Hook the charger up First then plug the charger into the wall then you should be okay (I hope).
And unplug the charger from the wall first before you dis
connect it from the battery.
You should be much safer that way.
jer 🙂
And unplug the charger from the wall first before you dis
connect it from the battery.
You should be much safer that way.
jer 🙂
The voltage reads 14.4V when charging and 19V when just idle. Weird. That spike sucks. Is there a simple solution I could wire into the circuit to limit the spike? Something to keep it under 15V at all times?
Thanks.
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Thanks.
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post #6 or just leave charger hooked up at all times and then just plug it in to the wall when you need it.
There maybe other methods as well but you said "simple".
jer 🙂
There maybe other methods as well but you said "simple".
jer 🙂
TA2024 shouldn't be supplied more than 12V.
Chances are, the 19V is the charger's unloaded output voltage. If you don't draw enough current from it (and with this amp you won't), the voltage will remain high.
Chances are, the 19V is the charger's unloaded output voltage. If you don't draw enough current from it (and with this amp you won't), the voltage will remain high.
You could build a regulator for it.
I just read the data sheet
16v absolute maxium
12v to 13.2 typical operating maxium.
I was thinking that this chip could handle like 26v or something but it doesn't
Just build a 12v 2or3 amp regulator and you should be doing good!
jer 🙂
I just read the data sheet
16v absolute maxium
12v to 13.2 typical operating maxium.
I was thinking that this chip could handle like 26v or something but it doesn't
Just build a 12v 2or3 amp regulator and you should be doing good!
jer 🙂
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Is the polarity of the connector on the charger correct?
Reverse voltage would certainly kill the electronics.
Reverse voltage would certainly kill the electronics.
Would that Zener diode really work? I am running 12V with a (average 1.0 to 1.5 amp draw with 4 amp peaks). That 1 WATT rating is sufficient? Wired in parallel you mean across the negative and the positive?
Thanks.
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Thanks.
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The safest way is to use a series regulator right before the amp, if you are willing to live with 10-11V reaching your amp.
Alternatively a more risky method - verify the voltage of your charger/battery when it is being super overcharged. If it does not go beyond 15 or 16V, then the zener in parallel only need to pass the 19V spike at the start.
Risk is, if your battery decides to disconnect somehow while charging, steady 19V will pass through the zener.
Alternatively a more risky method - verify the voltage of your charger/battery when it is being super overcharged. If it does not go beyond 15 or 16V, then the zener in parallel only need to pass the 19V spike at the start.
Risk is, if your battery decides to disconnect somehow while charging, steady 19V will pass through the zener.
Here is a regulator for 2amps if you need more current you can just parallel more stages.
This is just one of many types that you can use.
But it is quite simple.
Just use any 1N400x diode for the diodes in the circuit.
A 1 watt zener diode will not regulate 2+ amps at 12volts.
jer 🙂
This is just one of many types that you can use.
But it is quite simple.
Just use any 1N400x diode for the diodes in the circuit.
A 1 watt zener diode will not regulate 2+ amps at 12volts.
jer 🙂
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Just make sure that the LM7812's that you use are rated for 1 amp or greater as some are only .5 to .7 amps.
There are some that are rated at 1.5 amps or more,The LM340-12's are rated at 3 or 5 amps.
I will look up some current numbers.
But if you Google up the LM7812 you will find a ton of info on them.
jer 🙂
There are some that are rated at 1.5 amps or more,The LM340-12's are rated at 3 or 5 amps.
I will look up some current numbers.
But if you Google up the LM7812 you will find a ton of info on them.
jer 🙂
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