Hi i am looking for a diagram on a battery charger with diodes, as I have very old battery charger without diodes.
If anyone can give the drawing on how to replace Diodes with diode velue.
Thanks
Lofty

 

However old it is it must have at least one diode!
How much current is the charger rated at?

 

Hello,

Does it contain a component with a lot of ribs?



That could be a selenium rectifier:
https://en.wikipedia.org/wiki/Selenium_rectifier

Bertus

 

Simplest one uses a bridge rectifier and transformer ...

 

Does the battery charger have something that looks like this?




This is a photo of a selenium rectifier (diode).

 

Hi This is a English DAVEN set 6/12 volts, It is so simple it does not have selenium rectifier.
Let me give you the photo how it is inside and outside.

 

There's only one wire going to the thermal cut-out at top right of the picture, so what you show can't be the complete charger.

 

hi,
Check this image.
E

 

There's only one wire going to the thermal cut-out at top right of the picture, so what you show can't be the complete charger.

Yes it is just like you see let me exemple how this Charger works, there are two out put one is 6 volts and the other is 12 volts the main wire goes through fuse and the other wire goes from thermal to two way switch to select charging current 6/12 volt that it.
It is working just fine but I need to put Diode can i do that.

 

If it worked previously without a diode than why does it need one now?

 

If it worked previously without a diode than why does it need one now?

Just thought to put diode so if someone puts the positive on wrong side it should help the fuse or thermal cut-out.

 

Just thought to put diode so if someone puts the positive on wrong side it should help the fuse or thermal cut-out.

A diode won't help that.
Think about it.
The normal charging current it out of the charger and into the positive battery terminal.
If the battery is reversed, the current will still be in the same direction, only much larger, so the only protection for that is a fuse or circuit breaker.

 

hi,
Looking at the TS's photo's, there seems to be a regular cartridge fuse.
In series with the secondary winding, is what looks like a thermal cut out, could that actually be very a old fashioned mechanical vibrating rectifier that is magnetically energised by its proximity to the transformer magnetic field.????
E

 

could that actually be very a old fashioned mechanical vibrating rectifier that is magnetically energised by its proximity to the transformer magnetic field.

Good thought. It may well be.
Does it vibrate when the transformer is connected to the mains? That would clinch it.

 

could that actually be very a old fashioned mechanical vibrating rectifier that is magnetically energised by its proximity to the transformer magnetic field.?

The magnetic field would pull the contact at twice the line frequency, so I don't see how that could work as a mechanical rectifier.

 

The magnetic field would pull the contact at twice the line frequency, so I don't see how that could work as a mechanical rectifier.

Unless the blade is magnetised or has a magnet attached to the back.

 

hi Babu,
Could you confirm that when you last had it charging a battery, it had no rectifier of any kind.??

E

 

hi Babu,
Could you confirm that when you last had it charging a battery, it had no rectifier of any kind.??

E

Yes and it is working very okay.

 

hi Babu,
Could you confirm that when you last had it charging a battery, it had no rectifier of any kind.??

E

yes there are no rectifier