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A bit random, but.. ZM, I was always wondering if there is a point of having this kind of symmetrical-balanced amp if all your sources are not balanced?
separate issue , isn't it ;
however , just to spoil part of Buzz's happiness :
As if 4 power supplies wasn't enough, you get closer and closer to the amp in the title 😛
Definitely best to run a balanced source.
Main benefit I see of running balanced circuit with single ended source is power supply is not modulated with signal while in Class A, and you are able to create 4 x the power at the output working with low voltage parts eg sk70/sj74 ie no need for cascode
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me tellin' that gnd is just state of mind ;
take that primary arrangement (ref gnd) just as arbitrary ; connect your + and - from XLR wherever you want ..... even across primary , while stickin' gnd wire to potato
take that primary arrangement (ref gnd) just as arbitrary ; connect your + and - from XLR wherever you want ..... even across primary , while stickin' gnd wire to potato
Concept bias PSUs
The schematic and pictures of the amp suggest the following for the biasing circuit:
A detailed schematic of this concept bias psu will follow.
The schematic and pictures of the amp suggest the following for the biasing circuit:
- PSUs ride atop and are referenced to the power rails; but not to ground.
- May need to read and especially confirm the presence of the bias voltage on each SIT; which must be rock stable.
- Expect different bias voltages for the 4 SITs. This may require up to 4 PSUs [stereo] ; but one may get away with only two; one for each 23 V power rails.
A detailed schematic of this concept bias psu will follow.
Jensen transformer datasheet:
http://www.jensen-transformers.com/datashts/112lcf.pdf
JT-112-L
2SJ28/2SK82=
E=mc2
😀
http://www.jensen-transformers.com/datashts/112lcf.pdf
JT-112-L
2SJ28/2SK82=E=mc2😀
it's best to situate each of these 4 wall mounted PSUs in different room ;
that way , sound will be more diffused and spatial
that way , sound will be more diffused and spatial
The approach which I posted is basically like the one you have already proposed in an earlier post and in the F6 thread; but simpler.it's best to situate each of these 4 wall mounted PSUs in different room ;
that way , sound will be more diffused and spatial
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What be basic characteristic for this transformers maybe i can find some nice equivalents aviable like Lundahl or something
4 independent 150R* windings , usually arranged in 1+1:1+1 , giving 600*:600* , both center-tapped
in fact , common telephone repeater
* so called
in fact , common telephone repeater
* so called
Well, the sleazy fake version of this amp will be not be anywhere near so simple (most certainly not 3 parts - not anything near that), but I'm going to try and limit the pot-tweaking for the power supply to one pot, and limit the supply to one decent center-tapped transformer. At present, I've gotten a simulation to DC balance. I'll look at distortion and actual implementation later, as I have other audio fish to fry (record reviews). Oh yes, and the real details will be in another thread entirely, so as not to dilute this one.
nope , he's saying : "ZM's coffee mug is this big , 3 times a day ..... so that's why there is no night ! "
btw. Pa is cheating - he's using just half of heatsink , for stereo
Nelson's done a fine job showing just how linear these babies can be even in a 'native' state.
That said, this looks Ike a placeholder of sorts like we get in many of his articles.
The output impedance in particular would be happy to get some attention - at 4 ohms (based on the talk), it seems to fall into a strange twilight zone between a voltage source amp and a current source amp. I'm staying tuned for the next episode of .....
That said, this looks Ike a placeholder of sorts like we get in many of his articles.
The output impedance in particular would be happy to get some attention - at 4 ohms (based on the talk), it seems to fall into a strange twilight zone between a voltage source amp and a current source amp. I'm staying tuned for the next episode of .....
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