Fet based phase splitter?

danielwritesbac · 12th November 2011, 01:57 AM

Just for fun and curiosity, is it possible to make something very much like the MooseFet IRF710, except with the major difference being phase splitter duties for bridging amplifiers?

danielwritesbac · 12th November 2011, 09:03 AM

http://classicvalve.ca/docs/MooseFET_docs_v1.pdf There is the moosefet preamp with schematic. Howabout a phase splitter much like that?

But, really most any fet based concertina / phase splitter would be interesting to try. Failing that, well, just please "anything" more interesting than yet another boring DRV134.

danielwritesbac · 13th November 2011, 05:57 AM

I have to purchase and/or build several options to interview for bridging the LM1875 Triple Parallel project.

These modules need something to bridge them, and I wouldn't want anyone to get bored. Notice the current handling. These are for loud fun playback, of concerts. But more specifically, the amplifiers themselves are able to provide the feature of fore-aft depth from a monophonic speaker, but they fail to provide the matching width feature to complete the requirements of a plausible substitute for a concert.

The apparent width presented by a (each) monophonic speaker will have to be provided at the input of the amplifier. I'm hoping to find the means to bridge them that will include this missing feature, because that would be elegantly streamlined.

danielwritesbac · 13th November 2011, 09:07 AM

Research is progressing slowly, but turned up:

OP275 by Iam444
Post: Anyone else tried an opamp as a driver?
Schematic:
This looks very do-able, but not necessarily better than DRV134? Opinions?

"MOSFET as a cathodyne splitter by" Miles Prower
Post: FET Phase inverter to drive valve PA
Schematic:
This doesn't quite look ready for prime time.

RJM1 · 12:02 PM

Probably overly complicated, but works well.
Note: R5, C1 not needed, on the schematic to see error voltage without DC offset

kenpeter · 13th November 2011, 02:47 PM

Re 1st schematic of post#4:
I don't see any purpose to the 100R that the 1K stopper won't do.
And no purpose to the 470K, that the feedback resistors won't do.

Lazy Cat · 13th November 2011, 03:31 PM

According to address of the thread topic, I suggest you something like this.

kenpeter · 04:12 PM

Throwing my own confusion at it.

Choice of njfet not critical, any
pair that matches and conduct
up to 7mA without forward bias
on the gate.

If you tryin' to drive some toobage,
might even get a little A2 action...

kenpeter · 04:27 PM

Lazy, I'm at a loss to see how yours splits phase?
Seems like both paths to output are inverting, and
nothing to guarantee a specific gain or gain balance....

-----

OK, unity gain non-inverting. Confusing cause you
drew neg rail at the top, and abuse symbols that do
not suggest which ends might be source and drain.

Yeah yeah, I know some jfets are symmetrical.
But doesn't help clarity to draw them that way...

It still don't split...

mickeymoose · 13th November 2011, 04:15 PM

No circuit from me!

You are not splitting anything, you are inverting
It is not phase, it is polarity

Beeing a tech forum we should use correct terms, I know it sounds petty and pedantic, but you would not like your doctor say: you have HepB when it is HepC, would you? E

12th November 2011, 01:57 AM	#1
danielwritesbac diyAudio Member Join Date: Nov 2007	Fet based phase splitter? Just for fun and curiosity, is it possible to make something very much like the MooseFet IRF710, except with the major difference being phase splitter duties for bridging amplifiers?

13th November 2011, 04:06 PM	#9
kenpeter diyAudio Member Join Date: Nov 2007 Location: Dallas	Lazy, I'm at a loss to see how yours splits phase? Seems like both paths to output are inverting, and nothing to guarantee a specific gain or gain balance.... ----- OK, unity gain non-inverting. Confusing cause you drew neg rail at the top, and abuse symbols that do not suggest which ends might be source and drain. Yeah yeah, I know some jfets are symmetrical. But doesn't help clarity to draw them that way... It still don't split... Last edited by kenpeter; 13th November 2011 at 04:27 PM.

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12th November 2011, 09:03 AM	#2
danielwritesbac diyAudio Member Join Date: Nov 2007	http://classicvalve.ca/docs/MooseFET_docs_v1.pdf There is the moosefet preamp with schematic. Howabout a phase splitter much like that? But, really most any fet based concertina / phase splitter would be interesting to try. Failing that, well, just please "anything" more interesting than yet another boring DRV134.

13th November 2011, 05:57 AM	#3
danielwritesbac diyAudio Member Join Date: Nov 2007	I have to purchase and/or build several options to interview for bridging the LM1875 Triple Parallel project. These modules need something to bridge them, and I wouldn't want anyone to get bored. Notice the current handling. These are for loud fun playback, of concerts. But more specifically, the amplifiers themselves are able to provide the feature of fore-aft depth from a monophonic speaker, but they fail to provide the matching width feature to complete the requirements of a plausible substitute for a concert. The apparent width presented by a (each) monophonic speaker will have to be provided at the input of the amplifier. I'm hoping to find the means to bridge them that will include this missing feature, because that would be elegantly streamlined.

13th November 2011, 09:07 AM	#4
danielwritesbac diyAudio Member Join Date: Nov 2007	Research is progressing slowly, but turned up: OP275 by Iam444 Post: Anyone else tried an opamp as a driver? Schematic: This looks very do-able, but not necessarily better than DRV134? Opinions? "MOSFET as a cathodyne splitter by" Miles Prower Post: FET Phase inverter to drive valve PA Schematic: This doesn't quite look ready for prime time.

13th November 2011, 02:47 PM	#6
kenpeter diyAudio Member Join Date: Nov 2007 Location: Dallas	Re 1st schematic of post#4: I don't see any purpose to the 100R that the 1K stopper won't do. And no purpose to the 470K, that the feedback resistors won't do.

13th November 2011, 04:15 PM	#10
mickeymoose diyAudio Member Join Date: Nov 2008	No circuit from me! You are not splitting anything, you are inverting It is not phase, it is polarity Beeing a tech forum we should use correct terms, I know it sounds petty and pedantic, but you would not like your doctor say: you have HepB when it is HepC, would you? E