Of course if you already have reservoirs in there. I did not think that only missing regulators was the problem but it was about no DC nowhere around. Ripple is no problem to an LED.
Ok thank you and try the noDAC with only DSD, is the way to go.
Thanks and try the noDAC is the way to go ��.
Thanks and try the noDAC is the way to go ��.
I just only have a C-Media USB --->I2S & TOS card for Subbu (which still plays much better from DVD). My better native USB DAC is Aune S16. I will see what filter components I may have around and try the card on P2D noDAC some time. Good luck with your new PSU (or is it a full new Valve Itch?) build.
*won't work, it takes a more modern chip USB card as I saw later
The LED will behave like a half wave rectifier diode and the 2K2 resistor as the load I believe and it will light up on positive wave bursts.
I strongly recommend either connecting a reversed diode across the LED or connecting a rectifier in series with it. Most LEDS do not like being reverse biased and will break down with as little 3 - 4V reverse polarity across them. Note on 50Hz power you might find the flicker annoying. Operating on DC is preferable.
Are you sure that you compare the same mastering or copues from the master?
When the digital master is not the same as the nalaogue master ist so forget it. Let the de-emphasis of the RIAA like it is - flat.
By the way, it is well known that, sometimes still today, mastering studios use the old RIAA-emphasis curves they had used before RIAA was established - for example it was for companies like DECCA, RCA etc. to expensive to throw away the old equipment.
Logical it's better to use the correct de-emphasis for those records - here for example old mono records (and use a good mono cartridge as well). You will be astonished about the sound quality of those old "black gold"!!!
Yes good advice. AC source for an LED is not optimum. But what if in need and having no other parts than a heaters trafo an LED and a resistor? A very unlike scenario but I thought lets investigate it just for fun. This little generic LED proved a tough guy at 6V RMS 50HZ. For half an hour at least until it was too boring to wait for it anymore for doing something bad. 🙂
It wasn't as bright as with DC of course but still bright enough. The flicker was showing up through the phone's screen refresh but it was elusive to the naked eye.
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They may last hours, days or even weeks but they will degrade over time, and in some cases they fry quickly. I can't imagine a scenario where some suitable diode isn't available in a short time frame, but a pair anti-parallel connected LEDs would work. Tuner Information Center (TIC) has many references to the LED replacement lamps running on AC that failed or got dim very quickly.
The flicker is more or less annoying to specific individuals and is most often noticed in the field of peripheral vision. I found the flicker from 50Hz incandescent lamps noticeable from some angles as a teenager. These days I don't know. Very visible on 25Hz which was common in upstate NY and a few other places into the 1960s. NYC's MTA was still using 25Hz rotary converters in the late 1990s to make 600VDC track power, CON ED had a contract to provide 25Hz power for this purpose until 2000.. IIRC.
I changed UF4007 B+ rectifiers for schottky SIC C3D02060F WOLFSPEED, Diodo Schottky de Carburo de Silicio, SIC, Serie Z-Rec 600V, Unico, 600 V, 4 A, 4.8 nC, TO-220-F2 | Farnell element14 Espana
Also I will try only one power transformer (Lundhal) in place the Lundhal only for B+ plus two more 12V 3A for heaters.
Merlin, it's your turn to search which master is used - Google is your friend.
I only want give you the information about the "truth" of records emphasis and de-emphasis. You should keep more calm about that things and not running to change any things because of one record... Some are building phono stages with adjustable EQ-variants - but this is a hot thing to design and I will not make a design course for this applications.
Anyway, record-EQ is one thing and the other truth is that even when the mastering engineers use the same master the result can very from mastering engineer to mastering engineer. What means that? For example two different engineers use the same master but one makes the mastering for analogue and the other one for digital. This can also result in different sound quality of the records.
So, like mentioned above, keep calm and enjoy the music.
Don't think so, heater regulators can't reach 6,1VDC
Transformer can deliver 63% current with cap input = 3A = 1,89A
Transformer can deliver 63% current with cap input = 3A = 1,89A
DC without regulator connected 8VDC
AC from tx 6,53VAC without regulator connected, only connected the bridge diode & mains cap filter.
AC from tx 6,53VAC without regulator connected, only connected the bridge diode & mains cap filter.
8VDC is not enough for non LDO regs. Its important we know of how much it drops when loaded then if to change something. Even if used for heating 2x 6N2PEV + 2x 6SN7 its theoretically just enough because they would ask for 1.88A at 6.3V. Little more at 6.1V. Measure DCin at connected regs.
Too low. The PSU schematic asked for 9V AC trafos. You heat all tubes from regs through one same winding?
Seems theoretically not wimpy for delivering 1.88/2=0.94A heating current for each branch. Is the mains AC alright at around 230V AC? Maybe your diodes have more than average spec drop? You can measure drop across their anode to cathode.