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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Simple High Performance DC Coupled Class A HPA with sub PPM THD
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Old 16th June 2018, 12:19 AM   #51
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
I am able to run my 86dB 50ohm HE400i’s on 95mA bias and it plays quite loud without distorting. The voltage swing is also important so maybe go for +/-18v at 95mA to 110mA would be a good combo without too much heat.
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Old 18th June 2018, 12:42 AM   #52
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Working with JPS64 on prototype PSU with hone etched board to test our concept.
System has CMC choke, DC-DC isolated step up with dual +/-24v outputs, followed by Texas Instr LDO VR’s, then a capacitance multiplier for slow ramp up starting, finally a CRCRC to clean it all up.

Here is the etched board ready to be drilled.

This could be a handy dual rail PSU for any application where you want ultra low noise supply wothbup to 310mA and up to +/-20v with simple 8v to 18v input.
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Last edited by xrk971; 18th June 2018 at 12:45 AM.
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Old 18th June 2018, 03:30 PM   #53
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
New PSU design verified to work now.

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Old 19th June 2018, 12:46 PM   #54
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
PSU was tested on amp and sounds great. Silent and hum free. Very compact compared to linear solution currently inside the case. Also, very liberating and safe to not be tied to 120vac mains. PSU supports up to 150mA bias per channel.

Simple High Performance DC Coupled Class A HPA with sub PPM THD-faa0c939-859c-4dff-bbb4-cd49578664cc-jpeg
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Old 19th June 2018, 02:49 PM   #55
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Given the success of the critical new DC-DC dual rail PSU, any new interest in this GB given no need for working with mains voltages needed for this amp?

Quote:
Badboygolf16v - 1 pair
Dabore84 - 1 pair
funch - 1 pair
kartk - 1 pair
Yourownbuzz - 1 pair
BabyDontHertzMe - 1 pair
Stellarelephant - 1 pair
passive420 - 1 pair
Pinnocchio - 1 pair
vvs7 - 1 pair
sarathssca - 1 pair
Gwrskien - 1 pair
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Old 19th June 2018, 03:44 PM   #56
ernesternest is offline ernesternest  Europe
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Hi X, please add me to your list. This is a bit complicated on my mobile.

Best

Ernst
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Old 19th June 2018, 05:19 PM   #57
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
GB List update

Quote:
Badboygolf16v - 1 pair
Dabore84 - 1 pair
funch - 1 pair
kartk - 1 pair
Yourownbuzz - 1 pair
BabyDontHertzMe - 1 pair
Stellarelephant - 1 pair
passive420 - 1 pair
Pinnocchio - 1 pair
vvs7 - 1 pair
sarathssca - 1 pair
Gwrskien - 1 pair
Ernesternest - 1 pair
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Old 19th June 2018, 05:52 PM   #58
stellarelephant is offline stellarelephant  United States
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Quote:
Originally Posted by xrk971 View Post
PSU was tested on amp and sounds great. Silent and hum free. Very compact compared to linear solution currently inside the case. Also, very liberating and safe to not be tied to 120vac mains. PSU supports up to 150mA bias per channel.
Cool PSU... Out of curiosity, does it sound any different to you compared with the torroid?
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Old 19th June 2018, 06:09 PM   #59
jwjarch is offline jwjarch  United States
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Count me in too! Looking forward to A/B'ing the Whammy, AKSA Lender, and this one!

Badboygolf16v - 1 pair
Dabore84 - 1 pair
funch - 1 pair
kartk - 1 pair
Yourownbuzz - 1 pair
BabyDontHertzMe - 1 pair
Stellarelephant - 1 pair
passive420 - 1 pair
Pinnocchio - 1 pair
vvs7 - 1 pair
sarathssca - 1 pair
Gwrskien - 1 pair
Ernesternest - 1 pair
jwjarch - 1 pair
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Old 19th June 2018, 08:56 PM   #60
ermine22 is offline ermine22  Australia
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Hmmm, guess I will have to bite...count me in for 2 pairs - 1 as a HPA and another to play around with as a fleawatt tweeter amp.
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