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13th July 2005, 06:26 PM
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#1 |
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diyAudio Member
Join Date: Jun 2004
Location: Kerala, INDIA
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Kunthrandum - OpAmp biased MOSFET amp
Hello again...
please share your valuable opinions and advice about this amp. http://www.ronybc.8k.com/kunthrandum.htm |
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14th July 2005, 05:24 PM
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#3 |
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diyAudio Member
Join Date: Jun 2004
Location: Kerala, INDIA
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There is minor changes to the page
I didn't construct this amp yet. Please check my design and let me know whether there is anything to be added, avoided or altered.
Please share your knowledge and experience over this circuit. Thank you... |
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16th July 2005, 12:25 AM
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#4 |
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diyAudio Member
Join Date: Jun 2004
Location: Warsaw
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check it for cross-conduction at 10kHz
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17th July 2005, 07:20 AM
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#5 |
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diyAudio Member
Join Date: Jun 2004
Location: Kerala, INDIA
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The simulated currents at both mosfet sources are shown in the figure. Using 1Vp-p, 10kHz at input, I found no problems. Please give me more details about the cross-conduction problem. I'm using LTspice here. What was the voltage across bias capacitor..?
Sometimes I get starting problems which could be eliminated by starting the 'quiescent current adj.' voltage from zero. |
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17th July 2005, 11:53 AM
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#6 |
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diyAudio Member
Join Date: Jun 2004
Location: Warsaw
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Very nice then. I thought a non-inverting opamp driving a lower BJT may have some phase shift and cause output stage mosfets to switch in wrong moments. But it looks OK.
regards |
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10th August 2005, 06:30 PM
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#7 |
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diyAudio Member
Join Date: Jun 2004
Location: Kerala, INDIA
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Version 1.2
Heyyy...
SORRY... I saw high cross conduction when I simulated the circuit with High gate capacitance mosfets, feed with a High-High signal (30Vp-p@200kHz). The circuit will smoke. I've modified the circuit and posted it on my website. Now it is OK in such conditions. Using current mirrors instead R15 & R16 in the previous circuit works also. Please donate... |
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