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Old 15th March 2011, 03:42 AM   #601
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If it's a depletion mode fet, then depending on the matching and
relative Vds figures the Gate may be negative with respect to the output.

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Old 15th March 2011, 07:44 AM   #602
angcl is offline angcl  Singapore
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Quote:
Originally Posted by Nelson Pass View Post
If it's a depletion mode fet, then depending on the matching and
relative Vds figures the Gate may be negative with respect to the output.


Hi Mr Pass,

Stupid question from me again.

1) How many VA for T1 and what is the suitable VDS if i use "IXTH6N50D2"?
2) is the sound better than the bulb ?



Thanks
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Old 15th March 2011, 01:50 PM   #603
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Quote:
Originally Posted by Nelson Pass View Post
If it's a depletion mode fet, then depending on the matching and
relative Vds figures the Gate may be negative with respect to the output.

Great ! Infact in this case , not matching the D Fets , the gate to output voltages are -2 and -4 V.
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Old 15th March 2011, 04:14 PM   #604
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My experience is that you can use an IRFP240 as the upper
transistor and save lots of money. To the extent that you
want a pure current source and can spare a volt, you can
raise the value of its Source resistor also.

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Old 15th March 2011, 06:40 PM   #605
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Quote:
Originally Posted by Nelson Pass View Post
My experience is that you can use an IRFP240 as the upper
transistor and save lots of money. To the extent that you
want a pure current source and can spare a volt, you can
raise the value of its Source resistor also.

And it works . Thanks a lot . So I set R5 1,47 for now , if it is correct probably we can also rise the rail Voltage to 40 volts or so
Attached Images
File Type: png FIGURE CS IRFP.png (39.1 KB, 578 views)
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Old 15th March 2011, 07:09 PM   #606
ra7 is offline ra7  United States
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You are fast Stefano!

IRFP240 must drop at least 4 volts. What is your drain voltage and current draw now?

This is turning out to be a great little 'tutorial' amp.
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Old 15th March 2011, 07:36 PM   #607
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You are fast Stefano!

IRFP240 must drop at least 4 volts. What is your drain voltage and current draw now?

This is turning out to be a great little 'tutorial' amp.
The current is the same , as set from the self-biasing D mosfet Q1 and is 1,6 A . Drain voltage at half the rail like before .
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Old 15th March 2011, 07:41 PM   #608
Variac is online now Variac  United States
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Great to have a definitive (for the moment) diagram.

Thank you Stefano (and goes without saying: thank you Papa too)
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Old 15th March 2011, 08:12 PM   #609
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I may have missed it, but what sonic difference does it make?

Fran
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Old 15th March 2011, 08:20 PM   #610
angcl is offline angcl  Singapore
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Originally Posted by woodturner-fran View Post
I may have missed it, but what sonic difference does it make?

Fran
Any ideal what is the output wattage for this setup ? same as before ?
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