HELP REQUIRED! run battery gadget via USB. - Electronic Circuits Projects Diagrams Free

Spatie1982 · 11th May 2009, 06:59 PM

Hi!

I have a set of headphones that I use regularly with my PS3. They plug into a control box thats fed from the optical output of the PS3. Unfortunately it's run via 2 AA batteries, and it's costing me a fortune! Rechargeable batteries don't seem to last long enough.

I'm looking to create something like this to power it, but it's been years since I did electronics at college, so I've forgotten most of what I have learnt!

I'm good at the actual building side of things, I'm just no good at designing circuits, so I'm hoping someone on here can help!

Thanks,
Richard

chconnor · 4th June 2009, 02:16 AM

My latest draft might be of use:
Kooky?: Replacing battery power with leads...

audioguru · 4th June 2009, 02:53 AM

The important two capacitors are not optional and are missing from the Instructables circuit.

Both circuits have the value of R1 too high. It must be 120 ohms or less for an LM317. It can be 240 ohms for a more expensive LM117.
When the value of R1 is too high then the output voltage rises when the load current is low.

Sceadwian · 4th June 2009, 03:05 AM

2 AA batteries is only 3 volts. 5 volts may be too much for your little device. Why do you have such a weird headphone setup? What's the point using the optical jack from the PS if you can't get power? You could use a simple 3 volt regulator.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar
Title	Starter	Forum	Replies	Latest
Battery help required	Toastedghost	General Electronics Chat	5	25th January 2009 06:30 PM
Help required for this SMPS Battery Charger	xyz9915	General Electronics Chat	1	7th June 2008 10:36 AM
Help with a LED gadget	Skeptical	Electronic Projects Design/Ideas/Reviews	6	15th May 2007 03:17 PM
Gadget of the week	tansis	Chit-Chat	3	27th June 2005 07:43 PM
working out the size of battery required	jon_jon_phenomenon	General Electronics Chat	4	21st March 2004 09:02 PM

11th May 2009, 06:59 PM	#1
Spatie1982	HELP REQUIRED! run battery gadget via USB. Hi! I have a set of headphones that I use regularly with my PS3. They plug into a control box thats fed from the optical output of the PS3. Unfortunately it's run via 2 AA batteries, and it's costing me a fortune! Rechargeable batteries don't seem to last long enough. I'm looking to create something like this to power it, but it's been years since I did electronics at college, so I've forgotten most of what I have learnt! I'm good at the actual building side of things, I'm just no good at designing circuits, so I'm hoping someone on here can help! Thanks, Richard

4th June 2009, 02:16 AM	#2
chconnor	My latest draft might be of use: Kooky?: Replacing battery power with leads...

4th June 2009, 02:53 AM	#3
audioguru	The important two capacitors are not optional and are missing from the Instructables circuit. Both circuits have the value of R1 too high. It must be 120 ohms or less for an LM317. It can be 240 ohms for a more expensive LM117. When the value of R1 is too high then the output voltage rises when the load current is low. __________________ Uncle $crooge

4th June 2009, 03:05 AM	#4
Sceadwian	2 AA batteries is only 3 volts. 5 volts may be too much for your little device. Why do you have such a weird headphone setup? What's the point using the optical jack from the PS if you can't get power? You could use a simple 3 volt regulator. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."