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Old 19th August 2003, 12:08 PM   #11
joensd is offline joensd  Germany
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I think that´s a good start.
You´ll have to experiment a little with component values or do more search what others used.
Basically it makes the gain depend on frequency.
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Old 19th August 2003, 03:21 PM   #12
protos is offline protos  Greece
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I made a "textbook" opa 627 , buf 634 headamp yesterday the sound of which was not bad at all but nothing special.This was powered by a regulated bench power supply.
I was wondering why we need the buf634 or indeed any buffer as most people are using (peranders ?) here and elsewhere .
I drove my Senn 600 directly from the 627 output which provided more than enough volume plus it was much more transparent than with the BUF.
I have also driven the headphones directly with just a DRV134 balanced line driver and this set-up seemed to me the best.It is also the simplest since you only need a couple of decoupling caps - no resistors needed.I used balanced drive and in this mode you get about 6db gain which might not be huge but is more than enough if you are driving it from a standard cd line out.
So for me it seems that keeping it simple sounds the best - no need for extra output buffers/stages when your cans only need less than 10ma.
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Old 19th August 2003, 06:08 PM   #13
joensd is offline joensd  Germany
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The "normal" opamps in typical DIP-packages are not intended for low impedance loads. Datasheets of such give performance and output voltage/current into 1kOhm for example.
Some opamps deliver +-50mA and more and might suffice at normal listening levels.
You probably even get away with 32ohm cans with high sensitivity.
Most 300ohm cans like Sennheiser should be OK but still distortion and performance should be much better with a buffer.
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Old 19th August 2003, 07:29 PM   #14
MBK is offline MBK  Singapore
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Hmmm, built an OPA2134/BUF134 combo and it sounds painfully detailed
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