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Old 4th December 2012, 09:54 PM   #1401
Salas is offline Salas  Greece
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Quote:
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No it is not. It works very well. My protoamp has run for months with this configuration.

No need to worry.

By using 50R you do not lose feedback. Distortion is the same. Damping factor is the same.
Being a CFB amp, only the 1K Rf position changes the current injection to the input node so the voltage gain division ratio does not modify crucial parameters? Is that a right way to sum it up?
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Old 4th December 2012, 10:03 PM   #1402
sonnya is offline sonnya  Denmark
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More or less.
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Old 4th December 2012, 10:06 PM   #1403
Salas is offline Salas  Greece
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OK, clear. Thanx.
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Old 4th December 2012, 10:09 PM   #1404
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Originally Posted by sonnya View Post
Damping factor is the same.
How is-it possible, while feedback is divided by 2 ?
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Old 4th December 2012, 10:19 PM   #1405
sonnya is offline sonnya  Denmark
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i will write up on this one tomorrow Cristophe.

R11 and C12 sets the bandwidth and R11 and R12 is an "emitter" resistor at lower frequencies.

By set emitter to 50R instead of 100R we raise the open loop gain by +6dB but at the same time we increases the closedloop gain by +6dB. => loopgain is untouched.
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Old 6th January 2013, 09:08 AM   #1406
vgeorge is online now vgeorge  Greece
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Hi Sonny,

one question, can we increase input impedance and if if yes, up to what value? Are there going to be any drawbacks to this?
If possible, it is going to be very helpful to my setup.
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Old 6th January 2013, 10:59 AM   #1407
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i will write up on this one tomorrow Cristophe . . .
Tomorrow never came
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Old 6th January 2013, 11:11 AM   #1408
sonnya is offline sonnya  Denmark
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Tomorrow never came
Sorry.. We have just been to busy.

We work 7 days a week. Have hired an engineer and an assembly lady. Will maybe need a Technician also.....
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Old 6th January 2013, 11:13 AM   #1409
sonnya is offline sonnya  Denmark
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Originally Posted by vgeorge View Post
Hi Sonny,

one question, can we increase input impedance and if if yes, up to what value? Are there going to be any drawbacks to this?
If possible, it is going to be very helpful to my setup.
You could change R1 to 22 - 100K only there will be a offset step when you connect/unconnect you source.
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Old 6th January 2013, 11:52 AM   #1410
vgeorge is online now vgeorge  Greece
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Quote:
Originally Posted by sonnya View Post
You could change R1 to 22 - 100K only there will be a offset step when you connect/unconnect you source.
That means no problem, as I never connect/unconnect live my sources.
Thanks Sonny.
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