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Old 12th May 2004, 03:27 PM   #21
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Quote:
Originally posted by officeboy
Something like Texas Instruments TL072, or On-semi's MC33078, or Nationals LF412 or LMC662?
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Old 12th May 2004, 03:31 PM   #22
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Quote:
Originally posted by carlosfm


Hah, I have no idea, thatís why I'm asking.
I just looked around for what they called low noise, fast op-amps.
ESP recommends FET type op-amps so that's what Iím trying. (Itís just for a sub crossover so not a huge deal)
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Old 12th May 2004, 04:03 PM   #23
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Quote:
Originally posted by officeboy

(Itís just for a sub crossover so not a huge deal)
Why didn't you say so?
Anything will do, and commercial designs always use the worst they can get (TL072, LM324...).
For peace of mind, and knowing that good op-amps also have better bass , when I made my Sub I used the OPA4228.
Very silent, very good, quad op-amp (or the 2228 for double) and curiously works very well with gains of 1 (buffer), despite of what BB/TI says in the datasheet.
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Old 13th May 2004, 02:06 AM   #24
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Quote:
I have done the parallel opamp thing for headphone amps
Please tell me how to parrarel opamps. It has 3 pins, +input, -input, output. Does parrarel several opamps is directly tied these 3pins with each other? Or have to put small value R for every opamp? Got picture?
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Old 13th May 2004, 02:32 AM   #25
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I built a small headphone amp for a friend using 2 TLO84s Quad opamps( one for each channel) and a TLO82 dual opamp.

The 84s had all of the + input for each chip tied together with a 100 ohm resistor inseries with the chip. The - input of each opamp was tied to the output of that amp with a 100 ohm resistor. the outputs were all connected together with 10 ohm resistors in series. This give an output current rating of about 70 - 80 ma. The TLO82 was set up as the gain stage driving the TLO84 buffers.

Not the greatest headphone amp in the world but not bad. Real cheap to make and very dependable.

Later BZ
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