headphone amp in 9V battery case
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
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 ...
Re: headphone amp in 9V battery case
Very cute idea, needtubes!
The aswer to your question is simple: OPA2228.;)
Very good, BTW.
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! ;)
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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