> Can anyone please share the Linear Audio volume 3 where this headphone amp discussed?
Linear Audio | your tech audio resource
I am sure we all respect copyright of Jan and are happy to pay the €3.49.
Patrick
Linear Audio | your tech audio resource
I am sure we all respect copyright of Jan and are happy to pay the €3.49.
Patrick
RNMarsh amp sikahr layout build manual v1.0
It's a good idea to specify Rf as 1/2 Watt -- happier thermally.
It's a bit of over-kill, but I use 1W Panasonics for the emitter resistors.
Uber lo noise
If you were going to build an over-the-top, cost-no-obect, unber-lo-noise power supply for a headphone amp, what would you recommend? TPS7A33, LT1963, Jung or Didden super-regs are obvious choices. If it could be done without remote sensing I'd prefer that. I'm hoping to save the cost of building and evaluating each, and would rather just use what others have already evaluated.
If you were going to build an over-the-top, cost-no-obect, unber-lo-noise power supply for a headphone amp, what would you recommend? TPS7A33, LT1963, Jung or Didden super-regs are obvious choices. If it could be done without remote sensing I'd prefer that. I'm hoping to save the cost of building and evaluating each, and would rather just use what others have already evaluated.
A suggestion--do the taste test yourself -- piano, male vocals and male speaking voice.
Somewhat like "reverse PSRR" -- the LM317 seems to put harmonics back on the rails:
An externally hosted image should be here but it was not working when we last tested it.
Unlike the Jung/Didden:
An externally hosted image should be here but it was not working when we last tested it.
This was a test suggested by one of the respondents to the LA article. It was done months after the article came out so there wasn't any "ex ante" bias.
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That is using 317_337 driving the load direct ?
It has been proven that many high NFB "Super Regulators" will oscillate with the F5-HA.
That actually includes my lab PSU, as well as the beloved Salas shunt.
An open loop PSU (cap multiplier or variants) has no such problems.
And the F5-HA has quite good PSRR.
So the verdict is still out, at least for that particular circuit.
I would tend to think that The Marsh has equally good PSRR ?
Patrick
It has been proven that many high NFB "Super Regulators" will oscillate with the F5-HA.
That actually includes my lab PSU, as well as the beloved Salas shunt.
An open loop PSU (cap multiplier or variants) has no such problems.
And the F5-HA has quite good PSRR.
So the verdict is still out, at least for that particular circuit.
I would tend to think that The Marsh has equally good PSRR ?
Patrick
Disregard previous
In retrospect, asking a power supply question in the Marsh thread was maybe not the best of ideas.
I ask that my question be ignored as it's not relevant to the Marsh Amp topic.
In retrospect, asking a power supply question in the Marsh thread was maybe not the best of ideas.
I ask that my question be ignored as it's not relevant to the Marsh Amp topic.
Thanks. I understand it isn't a test of Richard's device. "subjected to a 1kHz signal" - forgive me for being stupid but it is this bit that I don't fully get. The load is 1kHz sinusoidal? How done? If this is too off-topic then I will gladly transfer the tuition to PM correspondence.
Hundreds of pcb have been produced for this headphone Amplifier. Who have used shunt supplies? And, what are the thoughts from those many others now listening to their favorite music? Are there many using higher PS voltages?
Did anyone else also do the auto-EQ for flat response at the ear that was a part of the Linear Audio article?
THx-Richard Marsh
Did anyone else also do the auto-EQ for flat response at the ear that was a part of the Linear Audio article?
THx-Richard Marsh
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