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Thread ID: 54689	2005-02-19 09:48:00	Build a DC-DC converter	george12 (7)	PC World Chat

Post ID	Timestamp	Content	User
326491	2005-03-05 10:06:00	Yeah, at first I tried with a single 4AH battery from an electric scooter ( I have four of these). But it really struggled to put out the 4.6A the PC demanded, voltage dropped to 11V and the HDD wasn't spinning fast enough. So I stuck another two in parallel and it runs nicely. I'm using the 5v rail right now to charge my cellphone :D. I don't have a charger for it, but the 5v from the PSU is close enough to 5.2v for it to be happy. I had to solder the wires to the phone temporarily :(. It's a Kyocera 2235 I got for free (three of em actually, plus a Gtran 4020 (nice phone!:D) and three Nokia 5120/6120s. From the Telecom Willis St place, the recylce bin - all working great, but the Gtran doesn't have a battery :(. And I grabbed a pager with a nice big screen for the LCD. See my thread about the Gtran (I need to wire up a battery and charger).	george12 (7)
326492	2005-03-06 01:53:00	You might be able to pick up a cellphone car charger ... DSE have some at $4 at the moment ... I'm using a Motorola one which gives 8.2V to run a Sony HandyCam (which cost me $5). :) The trick there was making the connector to worklike the Sony one. You can open these up and change the voltage ... look for the voltage divider across the output which feeds pin 5 (needs 1.25 V at the regulated voltage) of the MC34063 regulator chip. I even unsolder the chips --- I got a box of 80 of these chargers for a good price -- and build bigger supplies.	Graham L (2)
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