Hi everyone
I am a beginner in electronic and i have a transformer that giving me 19v 10a ac after a 20a diode bridge and 35v 2200uf capacitor i get 27v dc
The problem is i need to make a car battery charger from it that means a voltage between 13.5v and 14v but i don't know how to reduce the voltage without reducing the amps.
If you can help me. Plz

 

Actually you’ll need current limiting to keep the current under 10A, to avoid overheating the transformer and certainly below 20A to protect your bridge. For a car battery, voltage regulation only matters towards the end of charging and in trickling. “Bulk” charging under a current limit is what happens before that. Check out Battery University for details.

 

I do not think your skills are enough to play with this type of voltage and current.
If you want to risk "I do not carry any responsibility legaly or not legaly"!

Here is a circuit for you:
https://www.electroschematics.com/6833/car-battery-charger-with-transistors/

 

Thanks for your time reading and advising me but is there any simple way this schematic is a little bit difficult to find its components
And i am always taking my security mesurments
thanks for all

 

Thanks for your time reading and advising me but is there any simple way this schematic is a little bit difficult to find its components
And i am always taking my security mesurments
thanks for all

The circuit you want is a voltage regulator with a current limiter to keep the max current below a dangerous level. This has been done and we can probably help you find one. Patience. If no one else beats me to it, I’ll see what I can find for you later today.

 

The circuit you want is a voltage regulator with a current limiter to keep the max current below a dangerous level. This has been done and we can probably help you find one. Patience. If no one else beats me to it, I’ll see what I can find for you later today.

Go on you are my HERO

 

Go on you are my HERO

The circuit that I gave you is fairly simple. If you need a simpler one, you should give up now. As for the components if you can not find them, we can help you find equivalent ones.

 

Go on you are my HERO

Well, here's one right out of the LM317 playbook. R1 senses the output current and you change R1 to give ~0.6V at whatever your target current is. Trouble is, this circuit is only good up to ~1.5A as-is. I'll keep looking for higher current versions.



And just so you know what's possible, here's what a professional solution looks like:

https://www.maximintegrated.com/en/app-notes/index.mvp/id/621

 

If you can unwind a few turns of the transformer secondary, to get the desired 14V.