There is no need at least for now and even if I took jlsounds I would certainly spend months improving it and would certainly not get the sound I am looking for.
PMD100 ,but it needs a great PCB and two separate low-noise regulatorsI'm using a DIR9001 too, but with an optical connection.
Which are the best sounding DFs in your opinion?
I'm working on my dac now. It's almost complete. Yesterday I added +5V on Jlsound - I don't know does it make sense? Anyone compared with and without?
Also I want to add some display for tech info - still looking that. I thinking to short the psu wires - do I need to?
Give me some advice on what else to do.
Also I want to add some display for tech info - still looking that. I thinking to short the psu wires - do I need to?
Give me some advice on what else to do.
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Should I change the radiator on Jlsound? He is hot!
I heard about dying Jlsound when man try to add a secondary psu and cut the jumper.
I heard about dying Jlsound when man try to add a secondary psu and cut the jumper.
That cooler on the regulating transistor (BD139 i think) also seemed too hot to me. I put a bigger cooler and reduced the supply voltage of the XMOS part to about 4.1V. Put one Si diode (1N4001) in the positive supply line to JLS. Now in the summer, the temperature of that cooler is around 50C. It will work like this for 100 years. 🤣
Yep, i changed it, worked great. Others then changed as well, worked for them too. So trialed and tested proper 🙂Should I change the radiator on Jlsound? He is hot!
I heard about dying Jlsound when man try to add a secondary psu and cut the jumper.
Yes, there is a pad below to be cut when suppling external power.
4,1V? - is that enough?That cooler on the regulating transistor (BD139 i think) also seemed too hot to me. I put a bigger cooler and reduced the supply voltage of the XMOS part to about 4.1V. Put one Si diode (1N4001) in the positive supply line to JLS. Now in the summer, the temperature of that cooler is around 50C. It will work like this for 100 years. 🤣
Yes4,1V? - is that enough?
From JLS manual: Using two external power supplies. One must cut external power supply jumper
located on the bottom side of the board, then provide external power supply for
USB side (400mA; 4.0V to 5.3V) on H1.1 and H1.2, provide external power
supply to H3.17 and H3.19 (100mA, 4.5V to 5.3V).
Slightly bigger cooler + slightly lower power supply voltage = 15C difference.
I don't know how important it is, but a lower temperature is certainly more favorable.
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I didn't reduce V with diode as diodes are noisy buggers, trimpot reduced to 4.7v on psu for xmos. It's enough with a slightly bigger heatsink than nixie's. I used this one https://www.mouser.com/ProductDetail/Aavid/ML26AAG?qs=8CFAbMbqSIh6s26TKymh3g==&countryCode=US¤cyCode=USD
It is possible to reduce the voltage on an adjustable regulator, but I use a fixed regulator LM1117T-5.0, so I added a diode. A 2.2 ohm 2W resistor can also be placed instead of a diode. TO220 cooler, the largest that can fit without touching anything. I isolated it from the transistor with a silicone pad.
In principle, there is no room for a much larger cooler than the original one, but we like to complicate things. 😎
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