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Old 1st July 2020, 08:25 PM   #41
kamis is offline kamis  Serbia
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What is the PCB copper thickness, 1 or 2oz?
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Old 3rd July 2020, 08:04 AM   #42
kamis is offline kamis  Serbia
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Mr Ovidiu, what is the copper foil thickness of the PCB-s you showed here? I wish to order a few. Bipolar version HPS 4.3 from your site is also interesting, but there is no schematic and gerbers for it.
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Old 4th July 2020, 04:26 PM   #43
syn08 is offline syn08  Canada
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Quote:
Originally Posted by kamis View Post
Mr Ovidiu, what is the copper foil thickness of the PCB-s you showed here? I wish to order a few. Bipolar version HPS 4.3 from your site is also interesting, but there is no schematic and gerbers for it.
All PCBs were 1oz copper (35u thick).

Is there a bipolar 4.3 mentioned on my web site? I seem to remember that 4.2 was the last bipolar version, 4.2 schematic and Gerbers are available on my web site.
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Old 4th July 2020, 04:59 PM   #44
kamis is offline kamis  Serbia
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Thank you very much. I am not able to open your site at the moment , it is a picture.
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Old 5th July 2020, 01:13 AM   #45
syn08 is offline syn08  Canada
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Quote:
Originally Posted by kamis View Post
Thank you very much. I am not able to open your site at the moment , it is a picture.
That's 4.2 not 4.3.
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Last edited by syn08; 5th July 2020 at 01:38 AM.
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Old 5th July 2020, 06:26 AM   #46
kamis is offline kamis  Serbia
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Quote:
Originally Posted by syn08 View Post
That's 4.2 not 4.3.
Which one to build? Is HPS6.1 better than 4.2? I have BF862 fets and also low noise bipolars. There is no dimensions information in your 4.2 gerber file.
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Old 5th July 2020, 05:06 PM   #47
syn08 is offline syn08  Canada
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Quote:
Originally Posted by kamis View Post
Which one to build? Is HPS6.1 better than 4.2? I have BF862 fets and also low noise bipolars. There is no dimensions information in your 4.2 gerber file.
There is no "better", there are only requirements and preferences. 4.2 is extremely low voltage noise (0.28nV/rtHz), has 5-10pA/rtHz (or larger, depending on the transistors you are using) input current noise, up to 100nA DC input current (after nulling, due to the thermal drift) and is rather power hungry (runs pretty hot). 6.1 has higher noise (0.4nV/rtHz), virtually zero input current noise (can be used with low output MM cartridges or high output MC cartridges), virtually zero DC input current and can be fed from batteries. Make your choice depending on your cartridge and preferences. Myself I am currently using 6.1 with a Benzo Micro low output MC cartridge.

Board size is 10.5 x 3.2 inches.
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Old 6th July 2020, 05:16 PM   #48
kamis is offline kamis  Serbia
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Low output MM cartridge? Is 3.5mv/5cm/sec MM suitable for HPS 6.1?
HPS 4.2 PC foil is also 1oz?
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Old 6th July 2020, 05:40 PM   #49
rsavas is offline rsavas  Canada
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When you order the boards you specify in the quote menu the fab choices such as copper weight, solder mask colour etc but these small powered boards usually only need 1 oz Cu
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Old 6th July 2020, 06:14 PM   #50
kamis is offline kamis  Serbia
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But HPS 4.2 designer told that it is power hungry and runs hot. Thicker copper is good for heat sinking.
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