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Old 18th November 2003, 12:04 PM   #81
PMA is offline PMA  Europe
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Quote:
Originally posted by peranders

Yes, I think SMD for DIY'ers is the next thing and also current feedback.....

Next step is to use 0204 parts

.... or TAS5111 ...
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Old 18th November 2003, 02:30 PM   #82
bocka is offline bocka  Germany
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Well, I'm only using µBGA if they're available. Prevents my projects to be copied...

0603 could be used by some DIYers, not small enough and can be soldered when using a fine tip.
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Old 19th November 2003, 04:20 AM   #83
sonnya is offline sonnya  Denmark
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Quote:
Originally posted by peranders
I have done some simulating on a SMD current feedback amp with Diamond buffer and the performance seems to be rather good. Bandwidth up to 25 MHz but how about real world influence? I expect over 1 MHz is very possible, maybe 10 MHz.

I notice that working point aren't very sensitive. 0.5 mA or 5 mA doesn´t mean much.

I'm very keen on making a small cute all SMD headphone amp, mayby with Jung Super Regulators.

I have attached the simulation files if somebody wants to fool around.
Bandwidth up to 1MHz is very possible, also in a poweramplifier. Just use Emitterfollower as output. Maybe use MOSFET's.

Try out other combinations of currentmirrors. As i have found out you can gain more phase margin than with the current mirrors you have used right know.

I my self would like high idle current, so it isn't jumping between class B and A when slewing fast.
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Old 19th November 2003, 07:05 AM   #84
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If I choose to have 10pF I get 70 deg, 22pF, 64 deg, 47pF, 55 deg.

22pF = 14 MHz, 47pF = 6 MHz

Simulationwise I think Wilson mirrors aren't so bad.

I have adjusted the currents somewhat but I have kept them rather low so my poor pcb won't go into flames. Total power consumption for one channel is 0.8 Watt.
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Old 20th November 2003, 08:10 AM   #85
Electrons are yellow and more is better!
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Here is the schematics which I'm working on. At the moment I have only one channel. First I'll make the pcb layout for one channel ready then I will duplicated it.

I wonder how good the temp stability will be? May I'll have to reduce the currents? I'll guess a prototype will give me the answer.
Attached Files
File Type: zip qrv06r0schema_p1.zip (27.9 KB, 180 views)
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Old 25th November 2003, 07:30 PM   #86
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The CAD files have left the computer so I start a new thread here.
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