Re: Milliamps and voltage help please
Quote:
Originally Posted by
Robin Hewitt
Problem with a 12 Volt battery is you will get over voltage when fully charged. 9 Volts really is the best bet, unless you pop in a regulator.
Can you get a 9 Volt regulator or do they leap from 6 to 12? 12 would very quickly have the same problem, even if low drop out.
Yep, LM2940CT-9 Buy Low Dropout Voltage Regulators 1A,9V,LDO Voltage Regulator,LM2940CT-9.0 National Semiconductor LM2940CT-9.0/NOPB online from RS for next day delivery. 9v out @ 1A max, max 0.2v dropout @ 100mA, typ 0.5v @ 1A. Only £1.33 each. They do a 10v one as well.
As an alternative MC2941 http://www.rapidonline.com/Electroni...egulator-65305 @ £1.75 will also do the same, but is programmable for any output voltage with 2 resistors.
Either will handle 12v -> 9v @ 400mA with no heatsink (tho case will be > 90degC so hot!) but a small clip on heatsink would be advisable (or just a couple of sq in of ally) if using a lead acid cell or other battery thats at 13.6v fully charged
Re: Milliamps and voltage help please
Quote:
Originally Posted by
martin54
What sort of size is the tank it's going into? Sorry don't know much about radio controlled models except some seem to be quite big. Just thinking that a 12v battery from one of those motorized cycles would probably do a good job. Friend of mine lent me 2 to power a small trolley & I was surprised how powerful they were for such a compact size battery.
Maybe if people are interested I should start a new thread I explain what I'm trying to do and get help with trying to it ? May help others in the future.
Re: Milliamps and voltage help please
He's going to attack the Reds from his living room via the Interweb.
Re: Milliamps and voltage help please
Quote:
Originally Posted by
boldford
He's going to attack the Reds from his living room via the Interweb.
I have T59 I know the weakspots lol Thread started if anyone is interested, I'll post as I go :)