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Old 7th May 2018, 10:23 AM   #4191
Salas is offline Salas  Greece
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Then ok with the fets. How much voltage drop you got across R201 and what value dummy load resistor you use?
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Old 7th May 2018, 03:24 PM   #4192
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0.537 volt between R201 legs and i use 39 ohms dummy load. R201 is 2.2 ohms but i remember measured it as 2 ohms. almost forget : i remember before changing the last 2 components that i measured output voltage (F+ and F0) without dummy load at all and its value is 9 volts, the same value with dummy load attached. so as if the voltage reference doesn't exist at all.
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Old 7th May 2018, 05:29 PM   #4193
Salas is offline Salas  Greece
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0.537V there is unusually low. Are the sinks getting any hot?
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Old 8th May 2018, 09:47 AM   #4194
goodjingan is offline goodjingan
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yes, it's lower than positive rail which is almost 0.7 volt but the CCS mosfets on both rail do warm up.
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Old 8th May 2018, 07:11 PM   #4195
Salas is offline Salas  Greece
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Exclamation UltraBiB

Salas SSLV1.3 UltraBiB shunt regulator
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Old 20th May 2018, 08:31 AM   #4196
goodjingan is offline goodjingan
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finally got the time to finish my project. it turns out this DAC can be powered with 9 volts on analog and 5 volts on digital. reducing the voltage output especially on Ref-D made CCS mosfets get really hot like my amp. but it has played for 4-5 hours without problem so i'll leave it as it is.



i know they seem to be not ideally positioned and messy but i still need room to build I/V converter in the future. although i still use cheap op-amps as I/V converter right now, it does sound very good. never been a fan of foobar, but this NOS DAC made foobar very enjoyable. i guess the naturalness of treble and more transparency balance things up. except for small mechanical hum on my transformers, it's very quite. if you see on the photos i don't use any noise reduction tantalum caps as the AD1862 datasheet suggested. i do use reservoir caps : 330 uF elna silmic 2 on analog and nichicon polymer (RNU series) on digital in the bottom side of the DAC.


overall this project is worth every penny of it. thank you Salas and Tea-Bag !
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Old 20th May 2018, 11:35 AM   #4197
Salas is offline Salas  Greece
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Congratulations! Nice to see that you have finished it. Great that you also like it so much. Maybe it can still play well with a little reduced CCS setting in the Ref-D? Even 10% less can make a difference for the sinks.
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Old 20th May 2018, 01:39 PM   #4198
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i don't have the correct bias resistors but i do have back up for every kind of mosfet here. so i'll be ready if any mosfet fails. maybe i like it hot
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Old 20th May 2018, 01:52 PM   #4199
Salas is offline Salas  Greece
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Alright
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