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Primaluna's AC Offset Killer
Primaluna's AC Offset Killer
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Old 2nd June 2018, 05:45 PM   #21
basreflex is offline basreflex  Spain
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ltspice tell me the the workings of the circuit.

the diodes act as a threshold for the dc component. without the diodes (rsw=1mohm 1A as the 10H coil is 1ohm).
with the diodes much less not zero , but tolerable.
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Old 2nd June 2018, 06:16 PM   #22
Alexandru is offline Alexandru  United States
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Thanks for sharing.

Any reasons for choosing MURS320 instead of STTH12R06FP?

Last edited by Alexandru; 2nd June 2018 at 06:19 PM.
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Old 2nd June 2018, 06:53 PM   #23
freddi is offline freddi  United States
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Primaluna's AC Offset Killer
how about a MUR1560 for the 4 diode circuit? (Crown amp rated 1KW/ch 8 ohm) - those are in the $2.50 range - is there something cheaper?
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Old 2nd June 2018, 07:27 PM   #24
basreflex is offline basreflex  Spain
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just took a diode available in the LT library that was 3A to demonstrate the operation. take any diode you like. you need more diode pairs if the dc offset is larger, and dissipate more in the diodes.

the offset might originate from unbalanced loads elsewhere in the grid.
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Old 4th June 2018, 05:24 AM   #25
Alexandru is offline Alexandru  United States
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It looks like PS Audio has a device that harvests the DC noise and converts it into light.
The owner explains how it works: Youtube1 Youtube2
It's called Noise Harvester and it looks like this:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Last edited by Alexandru; 4th June 2018 at 05:54 AM.
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Old 4th June 2018, 07:24 AM   #26
tomchr is offline tomchr  Canada
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I hope that's an April Fool's joke rather than an actual product.
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MOD686: Up to 240W/8Ω, <0.00025% THD. MOD86: 40W/8Ω, 0.000054% THD. HP-1: 3W/20Ω, -130dBc THD, 128dB DNR.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 4th June 2018, 07:42 AM   #27
basreflex is offline basreflex  Spain
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could be a handy tool for audio contractors. in a theartre it is important to connect your amp to a power socket that is not dimmed. this indicator does trigger on the noise spikes of a dimmed socket. a simpler option is a small cap to a neon bulb.
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Old 4th June 2018, 08:12 AM   #28
tomchr is offline tomchr  Canada
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Yeah. But there's no way it converts noise to light, thereby completely eliminates the noise as claimed in the video. Physics would get in the way of that rather quickly.

Tom
__________________
MOD686: Up to 240W/8Ω, <0.00025% THD. MOD86: 40W/8Ω, 0.000054% THD. HP-1: 3W/20Ω, -130dBc THD, 128dB DNR.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 5th June 2018, 07:37 PM   #29
Alexandru is offline Alexandru  United States
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Paul from PS Audio says it was a designed by one of their mad scientists and they are very proud of this unique product. Well, they says it eliminates noise..but not completely..that's why you probably need more than 1.

Can anybody measure these claims?
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Old 9th June 2018, 04:45 AM   #30
Alexandru is offline Alexandru  United States
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I've found another DC offset blocker. It looks very similar to Primaluna's isn't it?

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