Re: Voltage Stabilizer for 12 and 24V Systems - Use a car laptop charger Quote:
Originally Posted by ilangop SMPS charging a Li-Ion battery pack in a Laptop, you dont have to doubt the credibility. Since you have access to an oscilloscope, you can directly check the ripples. In my case I had bought to for an experiment. My Lambretta does not have a battery and the alternator can develop nothing more than 11.5 to 12V. Since the scooter was doing fine, I wasn't interested in opening it up & rewinding for a higher voltage. Instead thought about this idea for boosting the voltage to charge a battery. Yet to implement |
That seems to be quite an interesting project with your lambretta.
I found this on ebay - Universal Laptop CAR Charger 8 Connectors -DC 11 V to 14 V to DC 15V to 24V | eBay
Did you refer to a similar product?
If this works, my all headache will be gone. Quote:
Originally Posted by sgiitk For a heat sink the cheapest solution is either to mount the chip on the casing, or put a small U-shaped aluminium piece on the PCB. If your load is not too high too should work.
The classic thumb rule for the filter (input here) used to be 1000uF per ampere. As for the output as I said even 0.1uF will do. I think 470 for the input is fine. You can reduce the output (primarily for the size) with no loss.
No point of trying with a 12V battery since you must have 14.5+ at all times for the 7812 to work! |
The system is working pretty nice sir. The truck voltage has danced between 22.5 to 29 Volts since last evening. The truck has traveled 550+KM and my sensor output is rock steady.
The local electronics store in Thane did not stock any capacitor less than 1 uF. As the fitting is inside a truck dashboard, I have no space constraint at this scale. So, I guess its ok if I carry on with the 470/1 uF on LM7815.
The current required to drive the sensor is less than 330mA as per the manufacturer. Do you think I can make do without a proper heat sink?
The reason I am asking this is that because there are only three small components, I can get the circuit up without a PCB. The component legs can be soldered together and then they can be wrapped in normal insulation tape. Now, I can use a small metal strip and stick the components on it using quick fix and then wrap them up with tape. Theoretically this also should dissipate the heat from components. Unless I am missing something important.
Actually, if I can make do with jugaad arrangement, I will not have to load up my clients with any extra cost. A pretty solid circuit with triple redundancy (that is three of each component working in parallel) can be built within 100 Rupees.
I can't thank you and other participants of the thread enough by clicking the "thanks button". You guys gotta put "Thanks" door bell on your front doors. But it'll be noisy around your houses then.
Last edited by sen2009 : 27th April 2012 at 16:43.
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