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Old 6th September 2007, 10:28 AM   #11
Gordy is offline Gordy  United Kingdom
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Quote:
Originally posted by kubeek
No LT10 or mje243/253 in here
I think Bonsai meant LT1010.

See the first figure on the LT1010 datasheet: LT1010 + LT1056 + LM334 = instant headphone amplifier (just add potentiometer and 18Volt power supply).
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Old 7th September 2007, 12:45 PM   #12
kubeek is offline kubeek  Czech Republic
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I fugured that out too, but LT1010 costs here cca 6 bucks, so I will probably stick with the opamp + discrete buffer version, which is a way cheaper solution.
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Old 7th September 2007, 02:22 PM   #13
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Even cheaper, skip the diodes and have the output of the opamp on the emitters of the driver devices.
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Old 7th September 2007, 03:01 PM   #14
djk is offline djk
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"Even cheaper, skip the diodes and have the output of the opamp on the emitters of the driver devices."

Skip all that and have the opamp drive one output, and use a voltage regulator as a constant current source.
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Old 7th September 2007, 03:30 PM   #15
jcx is offline jcx  United States
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some relatively common headphones can require over 100 mA peak current to reach realistic spl

most older (available in PDIP) op amps can't drive that much current and require output current boost/buffers

but there is little need for darlington level current gain

a single ef with Class A ccs bias should be fine as output buffer inside the op amp feedback loop
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Old 7th September 2007, 05:13 PM   #16
djk is offline djk
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Any good opamp can deliver 10ma, drive an output with a Beta of 50, you can drive 500mA peak.

Build an Aleph type current source and set it to 200mA, it will be able to provide 400mA peak.

Run it all on ±10V, the output and current source will both dissipate 2W, and be able to drive 1.25W class A into 16 ohms.
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