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[tonysmoke]

 :-\hi all from jersey, hope some one can help i am looking for a transformer  240 to 12 vt  if someone can help regards  tonysmoke,

[boatmadman]

hi,

If you mean 240v mains to 12v dc, you cant do it with a transformer, you need a rectifier.

Ian

[tonysmoke]

hi Ian  you have lost me now, help wot is a rectifer,  i have a pro-peak constellation charger and it runs on 12v thanks tony

[Sandy Calder]

Hi Tony,
You mean a 12 volt power supply unit.(PSU)
The pro-peak charger is a field charger of some sort,probaly for fast charging race packs.
There may be issues unless your PSU is very high current...I don't know for sure.
It may be designed to draw from a 12 volt battery or a car's cigar socket.
Regards
Sandy Calder

[tonysmoke]

thanks sandy i have tried a pro-peak 240mains to 12volt power supply 13.8v and it blew up sent it back to westbourne twice, thay can do no more,

[Sandy Calder]

I see the IP2000  Pro-Peak Power Supply  is capable of 20 amp.
That translates to 240 watt where the charger can deliver 120 watt max.

I'd recommend you stick to a 24 amp hour leasure battery.
I wonder what sort of overload protection the PSU has or if it has a current limit.
An engineers bench top PSU usually has a dial current limit.

[tonysmoke]

thanks sandy, i will look into a leasure bat ,looks like the way to go regards tony,

[Martin (Admin)]

Constellation Pro-Peak Charger
from Ripmax

Main Features

• Fast Charge and Discharge
- 1-25 cell NiCad/NiMH Batteries
- 2-12v lead Acid Batteries
- 3.6-14.8v Lithium Ion/Lithium Polymer Batteries
• 100-700OmA Fast Charge Current (120Watt Maximum)
• 100-300OmA Discharge Current (20 Watt Maximum)
• User Definable Memories for
- Battery Pack Type, Number of Cells, Capacity
- Charge/Discharge Current
- Delta Peak sensitivity (NiCad/NiMH only)
• 2 Line LCD Display
• Delta Peak Detection/Zero Current Voltage Check
• Temperature detection voltage cutoff
(NiCad/NiMH only)
• 12v DC input voltage
• Audible Function Alarm
• Integral Cooling Fan

http://www.sussex-model-centre.co.uk/shopexd.asp?id=4985

[Martin (Admin)]

thanks sandy i have tried a pro-peak 240mains to 12volt power supply 13.8v and it blew up sent it back to Westbourne twice, they can do no more,

If you're blowing up the recommended PSU, that sounds like there is something wrong with your charger!
Personally, I use a modified PC PSU  - http://www.modelboatmayhem.co.uk/forum/index.php?topic=10935.0
I also use a 15v laptop power adaptor for another charger.

[boatmadman]

Sorry, I confused things there - I didnt click onto the fact you were meaning a charger circuit.

Ian

[malcolmfrary]

hi,

If you mean 240v mains to 12v dc, you cant do it with a transformer, you need a rectifier.

Ian

To clarify (?), To get from mains, (240V AC) down to 12 volts, you use a transformer.  You now have a nominal 12 V AC.  To turn this into DC, you need a rectifier, usually 4 diodes wired appropriately, or a bridge rectifier, which is one lump containing 4 diodes that somebody else has wired for you.  The nominal 12 V DC that you now have will need a regulator of some sort to prevent damage to whatever it is powering.  There are, of course, lots of variations on the theme.

[Sandy Calder]

hi,

If you mean 240v mains to 12v dc, you cant do it with a transformer, you need a rectifier.

Ian

To clarify (?), To get from mains, (240V AC) down to 12 volts, you use a transformer.  You now have a nominal 12 V AC.  To turn this into DC, you need a rectifier, usually 4 diodes wired appropriately, or a bridge rectifier, which is one lump containing 4 diodes that somebody else has wired for you.  The nominal 12 V DC that you now have will need a regulator of some sort to prevent damage to whatever it is powering.  There are, of course, lots of variations on the theme.

I couldn't put it better.
You'll notice plug in PSU's are getting smaller lately as 31 kHz transformers replace clunky 50Hz transformers in the consumer market

If it's not 100% clear what this thread is about.
an £ 80 field charger  in the picture is blowing a £35 20 amp IP2000 switch mode psu by the same "brand"
Regards
Sandy Calder

[dougal99]

Get yourself a mains/12v charger.

I've got a Jamara X-Peak 220. Runs off mains and a 12v DC input

Does Nicads, NIMHs, Lead Acid and Lipos

About £80 from dealer in the Mayhem List (usual disclaimer)

Cheers

Doug

[tonysmoke]

thanks all for all the help, new 240volt charger on its way,  cheers all tony , jersey