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Trickle Chargers - Page 5

post #61 of 72
5/19/11 at 11:39pm
Quote:
Originally Posted by i_djoel2000 View Post

hi again.. say i want to add an LED indicator to indicate whenever the charger is charging the battery. where should i place it?


Anyone ?
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post #62 of 72
5/20/11 at 4:28am

connect the resistor and LED at the power input jack.

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post #63 of 72
5/23/11 at 12:18am

how do i calculate the charging current rate? i'd like to set them to 25-30mA/hour. i'm using LM317T TO-220 style


Edited by i_djoel2000 - 5/23/11 at 12:21am
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post #64 of 72
5/23/11 at 12:44am

Use this formula

1.25/R = I

 

cheers

FRED

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post #65 of 72
5/23/11 at 3:42am
Quote:
Originally Posted by Fred_fred2004 View Post

Use this formula

1.25/R = I

 

cheers

FRED


thanks Fred!

 

in that case, the default configuration in the first page gives you 12.5mA charging current, correct?

 

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post #66 of 72
5/25/11 at 5:48am

i just made my charger, but it doesn't work, the amp won't turn on even though the battery is connected. i don't know what's the problem, and i'm pretty confident i followed the circuit correctly. both diode work well when i checked them with my multimeter. no idea about the LM317 though, but i assume it works decently as well since i've never used it at all until this moment. resistor is 1/4W 60.2 ohm

 

here are some pictures:

25052011420.jpg

25052011424.jpg

red wire is connected to battery, blue to amp (+) pole, black to (-) pole battery, and white to amp (-) pole

 

anybody can point what i did wrong here?


Edited by i_djoel2000 - 5/25/11 at 8:12am
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post #67 of 72
5/25/11 at 10:34am

Is your power jack shorted?

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post #68 of 72
5/25/11 at 9:06pm
Quote:
Originally Posted by Avro_Arrow View Post

Is your power jack shorted?



the lower pin is positive, upper and right pins are negative. i checked with my multimeter and there is no short between the lower pin to upper or right pin

 

i checked the charger last night and i still couldn't find what the problem is.. frown.gif

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post #69 of 72
5/25/11 at 11:22pm

Just trace out the positive path using your multimeter, start at the DC socket and work through the circuit at some point you will find it stops and theres the hole :-)

 

cheers

FRED

 

 

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post #70 of 72
5/26/11 at 5:00am
Quote:
Originally Posted by Fred_fred2004 View Post

Just trace out the positive path using your multimeter, start at the DC socket and work through the circuit at some point you will find it stops and theres the hole :-)

 

cheers

FRED

 

 


i just did..

 

should we have impedance reading across the diode? because i just traced the connection from dc socket, and stopped at the diode connected to LM317 because i didn't get any reading across the multimeter

 

i checked the diode using multimeter too, and they check out

 

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post #71 of 72
5/26/11 at 5:04am

Are you saying there is no positive voltage at the junction of the diode and the lm317 ?

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post #72 of 72
5/26/11 at 5:13am
Quote:
Originally Posted by Fred_fred2004 View Post

Are you saying there is no positive voltage at the junction of the diode and the lm317 ?


i connect the black rod to + dc socket pin, and then work my way down using the red one throughout the positive path and then it stopped at the junction between diode 1 and diode 2

 

sorry if my previous comment misled you..

 

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