Depends on the amp being used. I guess you rather mean what the effect of the feedback is called as seen from the load's perspective, not the feeback itself:bobodioulasso said:and
So, how do you call the kind of feedback described by the second drawing?
a) is constant voltage (drive impedance = 0)
b) is constant current (infinite drive impedance)
@Andrew: yes, one also can make negative output impedance. The whole span of possible output impedance is possible, from -infinity through zero to +infinity. One of course has to take care of system stability, with negative output impedances espcially.
EDIT: Take a look at this article from Rod Elliott:
http://sound.westhost.com/project56.htm
- Klaus
Re: Balanced F5
I am not shure what you precilely ask but it seems to me that you have to
-either use a balanced F5
-or to convert into an unsymetrical signal. Transfo or opamp.
vitalica said:Pretty please tell me if you can connect the balanced output from AlephP1, 7 second F5 (A + and the other in -)
I am not shure what you precilely ask but it seems to me that you have to
-either use a balanced F5
-or to convert into an unsymetrical signal. Transfo or opamp.
Re: Re: Balanced F5
- or you can go for Michael Rothacher's Amazing Circlotron, an amp derived from F5 that has a balanced input only.
Nelson said it'a a cute design.
http://www.audiohobby.com/
or
http://www.passdiy.com/default.html
bobodioulasso said:
- or you can go for Michael Rothacher's Amazing Circlotron, an amp derived from F5 that has a balanced input only.
Nelson said it'a a cute design.
http://www.audiohobby.com/
or
http://www.passdiy.com/default.html
Hi all
I built one channel of the F5, and now it's under test.
I have some problems. I am running the bias at 350 mA, becouse I have not jet enough heatsink, but I think it should work well.
The problem is that the offset that is 0 mV at idle, rises at about two Volts at clipping, that is about at 18 V when I give a sin wave of 1 KHz. Rails are +/- 23.5 VDC. That without load.
If I connect the load (8 hom 100W resistor), the clipping arrives at 8/9 V and the offset rises at 10 V or so.
Could please anybody give me some advice on this problem?
Thank you
Some pictures of the device under test
[
I built one channel of the F5, and now it's under test.
I have some problems. I am running the bias at 350 mA, becouse I have not jet enough heatsink, but I think it should work well.
The problem is that the offset that is 0 mV at idle, rises at about two Volts at clipping, that is about at 18 V when I give a sin wave of 1 KHz. Rails are +/- 23.5 VDC. That without load.
If I connect the load (8 hom 100W resistor), the clipping arrives at 8/9 V and the offset rises at 10 V or so.
Could please anybody give me some advice on this problem?
Thank you
Some pictures of the device under test
[
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Thank you for answear.
Caps are just DC filtering, can that be a problem?
Yes Papa, the positive wave start to clip and more the volume goes up more the negative wawe decrease, without clipping, until DC is reached. But that just under load. Without load both clips at 18VDC and offset rises at about 2 VDC.
Where have you seen tweeters Bobo?
Caps are just DC filtering, can that be a problem?
Yes Papa, the positive wave start to clip and more the volume goes up more the negative wawe decrease, without clipping, until DC is reached. But that just under load. Without load both clips at 18VDC and offset rises at about 2 VDC.
Where have you seen tweeters Bobo?
Hi Bobo
not jet, i'm at work
This is the actual schematic, nothing special, just added filtering caps and no NTC.
not jet, i'm at work
This is the actual schematic, nothing special, just added filtering caps and no NTC.
An externally hosted image should be here but it was not working when we last tested it.
