buzzforb. The MDC tool above can test other balanced systems. For example, lhquam's "Balanced F5 in a small footprint". His [cascoded or not] is a DIDO void of MDC. By contrast, F5X--the EUVL Approach, and the amp by Mr. Pass which practices US 5,376,899 are DIDOs with MDC.
Mutual Distortion Cancellation [MDC]
I made up this acronym which stands for Mutual Distortion Cancellation in a balanced or bridge amp. The distortion of one amp in the power output signal is mirrored by the companion amp so as to be of equal amplitude and in-phase,and thus not pass through the load or loudspeaker.
I like DIDO better
You seem very doubtful. Why?[/QUOTE]
Don't understand the underlined. Many different mechanisms to attain MDC. I read in EUVL's thread that the mechanism used in his F5X is different from that used by Mr. Pass; both of which are different from Zen Mod's Babelfish F6x. The probability is high that Funny^6 is a DIDO which is void of MDC; so wrote the inventor [Pass] of the patent said above in 1994.
This thread will benefit by including these elements.
- Show a legible schematic of the amp
- Explain to the readership how it works.
- Tell us its strength and weakess if any
best
I fully understand BabelfishF6 Bal; thanks to you via your clear hand drawn schematic. I do not fully understand Funny^6.
I wreote several times ;
in regular F6 , we are having two resistors for feedback net , making voltage divider , connected to bottom of input xformer coil , working in phase with input signal ....... in that way that positive (input) going signal on top of coil is decreased with (smaller) positive going feedback signal on bottom of coil
smaller resistor in feedback net is connected to gnd
if you take two channels of F6 and feed them with antiphase signals , you'll have bridged amp , for load connected to their positive outputs
imagine two (smaller) feedback resistors connected together on lower end, and then to gnd ;
now imagine their common node disconnected from gnd - now they both are acting as virtual gnd to other one , because signal going through each is antiphase to signal through other one ; their common node is still sitting on gnd potential , even if being floating in nature ; voilla! _ you have bridged circuit , with error correction - feedback is X-ed ........ through that node and also through common interaction of xformer coils
that's the same in nature as tail point in SUSY connected LTP ; famous McMilan resistors for SUSY Alephs ( and similar circs ) are having duty of decreasing any possible potential fluctuating in that point , in other words - increasing circuit symmetry
just conclusion - AC voltage in that point is exact measure of circuit assymetry ( and that's error , per se )
buzz can implement McMilan resistors in his Funny^6 too
edit : for reference , Buzz's Funny^6 sch attached :
editedit: attached edited and properly shrinked pic
in regular F6 , we are having two resistors for feedback net , making voltage divider , connected to bottom of input xformer coil , working in phase with input signal ....... in that way that positive (input) going signal on top of coil is decreased with (smaller) positive going feedback signal on bottom of coil
smaller resistor in feedback net is connected to gnd
if you take two channels of F6 and feed them with antiphase signals , you'll have bridged amp , for load connected to their positive outputs
imagine two (smaller) feedback resistors connected together on lower end, and then to gnd ;
now imagine their common node disconnected from gnd - now they both are acting as virtual gnd to other one , because signal going through each is antiphase to signal through other one ; their common node is still sitting on gnd potential , even if being floating in nature ; voilla! _ you have bridged circuit , with error correction - feedback is X-ed ........ through that node and also through common interaction of xformer coils
that's the same in nature as tail point in SUSY connected LTP ; famous McMilan resistors for SUSY Alephs ( and similar circs ) are having duty of decreasing any possible potential fluctuating in that point , in other words - increasing circuit symmetry
just conclusion - AC voltage in that point is exact measure of circuit assymetry ( and that's error , per se )
buzz can implement McMilan resistors in his Funny^6 too
edit : for reference , Buzz's Funny^6 sch attached :
editedit: attached edited and properly shrinked pic
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