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TDA1387 continuous calibration dac
TDA1387 continuous calibration dac
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Old 19th October 2017, 01:15 AM   #141
abraxalito is offline abraxalito  United Kingdom
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Quote:
Originally Posted by matt_garman View Post
At the risk of patronizing you, are you sure the polarity of the cap was correct? Positive to pin7, negative to ground? What kind of cap was it? Are you sure the cap is good?
Since I have hollowman on ignore I'll just point out here that the leakage of the cap could be an issue -a new cap might well take time for the oxide layer to form. With high leakage there will be little or no sound as the pin7 voltage will be lower than normal. I cannot explain the presence of hum - sounds like some wiring mistake was made in the process. I've shorted pin7 to GND (pin4) and the result was silence on my DAC, not hum.
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Old 19th October 2017, 03:19 AM   #142
didiet78 is offline didiet78  Indonesia
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I use 2200uF, and its sound good on my Orange Pi PC
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Old 19th October 2017, 03:46 AM   #143
matt_garman is offline matt_garman  United States
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TDA1387 continuous calibration dac
Quote:
Originally Posted by didiet78 View Post
I use 2200uF, and its sound good on my Orange Pi PC
That looks awesome!

Did you happen to post any details on your build anywhere else? I'd be interested in reading more about it if you've done any kind of write-up.
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Old 19th October 2017, 04:12 AM   #144
abraxalito is offline abraxalito  United Kingdom
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Very impressive for what looks like a hand-drawn PCB didiet! Are you using active I/V?
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Old 19th October 2017, 04:20 AM   #145
jambul is offline jambul  Belgium
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that is your IV richard, using bc560 before IV R. btw i use bc560 with your transistor IV which connect the base using around 2.5K resistor without any ccs .and its sound good.
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Old 19th October 2017, 04:28 AM   #146
abraxalito is offline abraxalito  United Kingdom
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Cool! Next step up then is putting the 5th order CLCLC filter before the I/V transistor. I've compared with and without filter and having the filter in 'cleans up' the soundstage allowing every instrument to fall into its allotted place no matter how loud they're playing.
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Old 19th October 2017, 04:53 AM   #147
didiet78 is offline didiet78  Indonesia
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Originally Posted by abraxalito View Post
Very impressive for what looks like a hand-drawn PCB didiet! Are you using active I/V?
Yep, your 1 transistor IV like om Jambul said.
If your 5th order CLCLC filter small in size, i will considered
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Old 19th October 2017, 04:55 AM   #148
didiet78 is offline didiet78  Indonesia
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Originally Posted by matt_garman View Post
That looks awesome!

Did you happen to post any details on your build anywhere else? I'd be interested in reading more about it if you've done any kind of write-up.
I just make pcb of abraxalito Dac to my need , nothing fancy
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Old 19th October 2017, 04:58 AM   #149
abraxalito is offline abraxalito  United Kingdom
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The red board you can see in this picture holds the CLCLC filter (left side) and the right side is the I/V stage. Because the filter needs a well-defined load, I bias the I/V transistor with more current (about 20mA) to get this particular load impedance. The extra transistors on the right are biassing current sources.
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Old 19th October 2017, 05:07 AM   #150
didiet78 is offline didiet78  Indonesia
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Did you post the schematic ?
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