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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

MUSES 72320 electronic volume
MUSES 72320 electronic volume
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Old 3rd February 2018, 03:16 AM   #371
ammel68 is offline ammel68  United States
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MUSES 72320 electronic volume
Too bad there isn't another member here who's willingly to take meldano's boards and populate them with all those nasty, hard-to-solder SMDs then sell them to folks like myself who aren't interested in soldering SMDs but want a MUSES 72320 volume control system for a reasonable price.

Last edited by ammel68; 3rd February 2018 at 03:19 AM. Reason: Spelling error.
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Old 4th February 2018, 02:17 AM   #372
ammel68 is offline ammel68  United States
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MUSES 72320 electronic volume
Quote:
Originally Posted by meldano View Post
No, only pcb and programmed controller.
How much are the boards shipped to the U.S.?

Thanks.
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Old 9th February 2018, 05:16 PM   #373
thuanth43 is offline thuanth43  Viet Nam
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Quote:
Originally Posted by meldano View Post
No, only pcb and programmed controller.
I've PMed you.
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Old 9th February 2018, 06:07 PM   #374
meldano is offline meldano  Germany
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Motor PSU boards avaible
http://www.diyaudio.com/forums/analo...ml#post4608834
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Old 9th February 2018, 07:07 PM   #375
LBHajdu is offline LBHajdu  United States
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Quote:
Originally Posted by ammel68 View Post
Too bad there isn't another member here who's willingly to take meldano's boards and populate them with all those nasty, hard-to-solder SMDs then sell them to folks like myself who aren't interested in soldering SMDs but want a MUSES 72320 volume control system for a reasonable price.
Well if you want something with a wider lead spacing, you could go with the DS1882 it's still surface mount but it's SOIC-16 which has a 0.05 lead spacing that's only half of what a DIP chip would be. It's much cheaper ($1.76) available from Mouser and Digi-key. It's used in the lower end Pass Labs products like the XP-10, XP-20, and INT-60. And the input impedance is higher (45K ohms). Most people agree that the MUSES72320 sound slightly better in fact the replacement to the XP-10 the XP-12 will replace the DS1882 with the MUSES72320. However the XP-10, XP-20, and INT-60 still I am sure made the Stereophile super excellent list and will all be classics. The attenuation is only 0dB to -62dB in 1dB steps. Just like the MUSES there are no built in Op-Amps.
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Old 19th February 2018, 09:43 PM   #376
andorianer is offline andorianer  Germany
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First THANK'S to meldano. I bought some of his PCB and programmed controller. Took some time to get the parts (especially the MUSES72320)...SMD soldering is OK (except some 805 resistors I never found again ) .... and the kit worked from the beginning perfect. I would say a new dimension of a type of preamp. I run the kit with the Power Amp Hypex NC400 or a AVM8000 clone, directly from my Pioneer Bdp LX88. No additional buffer or amplification necessary. Crystal clear , no harsh, you feel each movement of the bass drum and the spatial resolution is great. No more experiments which concept is the best, no more matching of transistors... Remote programming was easy and it works perfect. With some luck a friend brought me the Japanese MUSES kit from akizukidenshi.com. Much easier to solder, there were all SMD parts presoldiered. The ideal base to check out how the different OP Amps can sound... till now I can say that no opamp is the best choose. The only missing link is a remote input selector balanced. Maybe someone can help.
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Old 5th March 2018, 01:57 PM   #377
Sunsun22 is offline Sunsun22  Hong Kong
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I assembled a few 72320 volume control kits from akizukidenshi.com but all of them went into trouble now.

The first one get into problem (please refer to #348 of this thread), add a bit of soldering work and the problem disappeared. However the popping sound returns and this time; no matter how I solder and desolder the decoder, the pops remain there.

The second one went into trouble recently. It generates some high pitch ringing noise. I took out the decoder and connect to the PCB with extension leads, the ringing reduced but it is still there. I changed it to an ALPS VR and the noise is gone. Can anyone give me a clue on what is the problem with this? If you look at the schematic, there are two 10pf caps C1 and C2 in the circuit (refer to thread #353), what is it for? Can I increase the capacitance to cut out the ringing?

Last edited by Sunsun22; 5th March 2018 at 02:03 PM.
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Old 6th March 2018, 05:57 AM   #378
mt490 is offline mt490
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You probably need to inspect it with an oscilloscope to be sure what is going on. It was working, so what changed to make it not working?

First I would check if it is to do with soldering residues left on the board, which can cause issues particularly when the package pitch becomes finer.
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Old 6th March 2018, 06:17 AM   #379
Sunsun22 is offline Sunsun22  Hong Kong
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I did not change any value of the kit except swapped the 10pf caps to silver mica and the input 33R from 1/4W metal film to larger AMRG 3/4W made by Japan Amtrans.

Do you mean I have to trace the lines from input to output by the oscilloscope?

What is the function of the 10pF caps? Does this control ringing?
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Old 6th March 2018, 01:58 PM   #380
andorianer is offline andorianer  Germany
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Zu, I also soldiered one set a week ago. It works perfect from the beginning. Maybe just one of this problems like the bridge over the R out( select external or internal 5V) or the used ops? Please post some photos
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