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Old 14th December 2003, 06:27 PM   #1
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Join Date: May 2003
Default headphone amp in 9V battery case

Hello all-

I was trying to think of a good enclosure that would be ultra-compact and unique... and after a 9V battery blew up in my hand and I disassembled the thing I thought of using that...

It was a tight squeeze to get everything in, but I managed to do so... Pics and more about the amp are located here. Comments welcome


Does anyone have a suggestion for a good opamp to use with it? Power supply is limited to 6V (+/-3V) at about 5mA. Thanks
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Old 14th December 2003, 06:36 PM   #2
TNT is offline TNT  Sweden
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nice !

if you put the switch etc on the opposite side you could drive it with an other 9v battery. no cables just "mate" them if you see what i mean ...

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Old 15th December 2003, 11:07 AM   #3
Join Date: Mar 2003
Location: Lisbon, Portugal
Default Re: headphone amp in 9V battery case

Originally posted by needtubes
Does anyone have a suggestion for a good opamp to use with it? Power supply is limited to 6V (+/-3V) at about 5mA. Thanks

Very cute idea, needtubes!
The aswer to your question is simple: OPA2228.
Very good, BTW.
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Old 15th December 2003, 12:12 PM   #4
sek is offline sek  Germany
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You're challenging me, needtubes!

I'm dreaming of a PiMeta in a 9V battery now. Additional two batteries for supply, beautiful cable between the three, perhaps arranged as a stable and neat looking "battery pack"...

Very nice work!


PS: I'm currently developing an SMT version of Tangent's PiMeta for a smaller-than-mint-can enclosure. But a battery... challenging!
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Old 15th December 2003, 06:05 PM   #5
macboy is offline macboy  Canada
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Location: Ottawa, Canada
Both the NE5532 and JRC4580 (NJM4580) are suitable for driving headphones directly. Most opamps are not, as you have found. You would usually put a resistor in series with the output, but with such a low power supply voltage, you can probably omit it. Try it both ways I guess. The 4580 is spec'd for voltages as low as +-2 V, and the 5532 is spec'd for +-3 V. Texas instruments makes "clones" of both, and would probably be my first choice of a supplier (Their JRC4580 is a "RC4580").

Also consider using two batteries instead of one, so that you don't need to waste battery power creating a virtual ground using a voltage divider.
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