Comments on: Car battery charger

By: hari

hari — Sun, 13 Nov 2011 03:24:26 +0000

Tanks

By: seetharaman

seetharaman — Sat, 05 Nov 2011 17:13:51 +0000

Hi Binesh see my reply to Hari. the same will hold good for you also.

By: binish

binish — Fri, 04 Nov 2011 07:23:15 +0000

hai i have 12-0-12, 4a , can i use that in this circuit..

By: seetharaman

seetharaman — Mon, 31 Oct 2011 02:27:10 +0000

Hi Hari 4nos BY127 as bridge is ok but 12 volt may not be sufficient, you require 0-15 volt transformer. you can use 12 volt transformer with 4 BY127s in bridge and connect the output of the bridge rectifer through 2 ohm 20 watts wire wound resistance in series with positive lead to battery to be chargerd is just sufficient, no need for any IC etc.

By: hari

hari — Sun, 30 Oct 2011 06:32:13 +0000

Hai Seetharaman,
I have a 0-12v 3Amp step down transformer.I think,In this case ckt will change with Arranging BY127 as bridge order… is’t ok…?

By: seetharaman

seetharaman — Sun, 30 Oct 2011 03:05:27 +0000

Hi Nidesh C2 & C3 are ceramic disc capacitors with working voltage of 40volts or above.

By: Nidesh k g

Nidesh k g — Sat, 29 Oct 2011 17:28:52 +0000

sir,in this circuit, if the capactors c2,c3 are ceramic or polyster? and what is the voltage rating of c2,c3. sir its very urgent Pls reply thanks.

By: Andrew.sk

Andrew.sk — Fri, 04 Feb 2011 08:13:49 +0000

Hello peter we appreciate all the schooling and guidance but how do we get in touch with u for practical and theory lessons and can somebody study on line and get a certificate or diploma maybe even degree in the electrical and radio telecommunication? If yes please give us more details about this.

By: Seetharaman

Seetharaman — Thu, 14 Oct 2010 11:25:32 +0000

Hi Abhi the DC voltage will become low and as the battery voltage builds up your charging current will become too low and the battery may not get fullt topped up.
If you have only 12-0-12 2A on hand then use 2nos 1N5404 and a 2.2 ohms 10watts resistance and charge no other electronics is required. This will be the simplest charger watch for the terminal voltage once it reaches 14 volts terminate the charge, as the peak DC voltage can reach 12 X rt2(1.414). (appoximately 17 volts).

By: Abhi

Abhi — Wed, 13 Oct 2010 18:21:36 +0000

Can I use a 12-0-12 (2A) step down transformer instead of 15-0-15(3A) step down transformer? Please tell me.