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Recharging Circuit on Pint Amp

post #1 of 7
8/17/10 at 11:53am
Thread Starter 

Hello,

 

I was wondering how I would go about finding the parts and putting a rechargeable circuit in a pint amp? I pm'ed someone about it but he was a douche. Can anyone help? Thanks!

 

Joseph Kim

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post #2 of 7
8/17/10 at 12:18pm

The charging circuit on that amp is basically just 3 parts. U2 is a LM317, R1 is a 75 ohm resistor and D2 is a S1A diode.

 

Mouser part numbers are:

621-S1AB-F

511-LM317LZ

71-CRCW1206J-75-E3

 

viewer.png

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post #3 of 7
8/17/10 at 12:20pm

 

Tangent's Pimeta v2 schematic. Checkout page 2 (D1, IC1, RCCS).http://www.tangentsoft.net/audio/pimeta2/misc/sch-2.01.pdf

 

Hope that helps.

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post #4 of 7
8/21/10 at 5:58pm

I breadboarded the Pimeta v2 charging circuit. I had some problems with it , but it did recharge the NiMH battery.

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post #5 of 7
8/21/10 at 6:54pm

This little circuit has been a great help, sorry not sure who came up with it, it wasn't me :-)

 

tricklecharge1.jpg

 

LM317, 2 diodes, a resistor

 

I/1.25=R

 

I is the trickle charge current, R is the resistor in the circuit

 

I can't find the link but there was great pics

 

cheers

FRED

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post #6 of 7
8/21/10 at 7:46pm

Here is a circuit I use for my NiHM and Li Po batteries.

Current and voltage limited.

It's Figure 12 from the LM317 data sheet.

 

CHARGER.JPG

Limit voltage is set by P1 and current is set by R1

Sorry I don't know the formula for R1.

VS1 represents your power supply and V1 is the

battery under charge.

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post #7 of 7
8/21/10 at 9:15pm

The trickle charging circuit everyone points to:

53cabd22_trickle.png

 

U1 is a LM317 setup for constant current use with current set by R1.

 

There is calculator on this page to tell you what size R1 is for your desired current:

http://www.reuk.co.uk/Using-The-LM317T-With-LED-Lighting.htm

 

And a good judge for desired current for this kind of current is 0.01C where C is the battery size in mAh.  This will slow charge the battery.

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