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Old 20th May 2019, 10:46 PM   #101
savvas is online now savvas  Greece
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Originally Posted by Salas View Post
L-Adapter is aimed at substituting SMPS bricks for whole devices but you people will probably find more uses for it.
Yeah, that's what it was needed. It's just that an extra project got in the way and I had to postpone the Tinker thing a bit and I didn't want to leave the L-adapter just standing there.
I don't expect it will take the place of the Reflektor in this particular DAC but generally as pre regulator could have give have an impact that could bring the overall system sound to someone's liking.
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Old 21st May 2019, 12:46 AM   #102
Salas is offline Salas  Greece
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Its yet another interesting application of course. Lets see how it will finally blend there in the Bufallo 9028 DAC.
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Old 21st May 2019, 01:08 AM   #103
dewdrop is offline dewdrop  Singapore
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I noticed there is no provision for snubbers on the board?
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Old 21st May 2019, 01:46 AM   #104
Salas is offline Salas  Greece
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No, there isn't
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Old 21st May 2019, 02:30 AM   #105
alexkosha is offline alexkosha  United States
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L-Adapter
Sound might change a bit since Ele caps must get to the designed spec after long storage time. All semi and resistors are getting to required working points very quickly. I, personally, very skeptical about Burn-in, but defiantly support worm-up. Different subject...

Yes, my DAC is utilizing same chip as Buffalo DAC, which I did not auditioned. So, can’t say anything about compression. The only DAC that I used for comparison is my 9018 based one.
It is day and night in sound, and mostly due to fully independent 3 UntraBIB v1.3 PSUs for Katana components and L-adapter for RPi.

People like “meaty” sound and it is mostly related to the domination of 2nd even harmonic, if not to tweak whole system specifically to achieve such sound. This is typical SE triode tube signature. I like my sound to be bla-bla-bla (marketing nonsense with juicy epithets), but most important for me is realism when I do not see components and imagine performers in front of me.
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Old 21st May 2019, 02:46 AM   #106
Salas is offline Salas  Greece
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Did you ever discover why the HP lab PSU, (that one in your video clip has 1A spec, is it another one?) failed to power the RPi + LCD & 2.5" Hard Disk of your Katana rig? You had mentioned that in another thread sometime ago I think.
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Old 21st May 2019, 03:58 AM   #107
alexkosha is offline alexkosha  United States
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Oh. I totally forgot. My apology. It was V drop over long thin cables, exactly as you predicted. All is started to work fine when I raised Vout to 5.1V. LCD and HD left connected and my total current fluctuated around 1.8A. Itís impossible to measure Vin on Katana Isolator due to USB type C SMD female connector. Way to small pads for my leads. I lost appropriate once. Iíll get new needle probs soon and might be able to reach these pads soon.
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Old 22nd May 2019, 02:13 PM   #108
Malefoda is offline Malefoda  France
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Checking my stock (fresh) caps, does C1/C2 require special specs? Got some Panasonic FR 220ĶF/50V left.
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Old 22nd May 2019, 06:45 PM   #109
Salas is offline Salas  Greece
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No special specs required because this circuit's stability is not influenced by the output capacitor's ESR. Those caps should be 105C rated though, especially when a board level sink will be used for the main transistor and the output power in some applications will be pushing it to high temperature. Because those caps are at close distance. C1 is located the closest to that heat radiator. Its role is being a filter for the reference voltage.

In comfortable temperature installations those capacitors choice can be broadened to 85C types also. C2 at least which stands further from the sink. As it is the output capacitor and some people may have own preferences for such a location. Think with closed box ambient temperatures in mind if there is a plan of using an enclosure for the project at a later point.
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Old 23rd May 2019, 05:35 AM   #110
nano35 is offline nano35  Hong Kong
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I was setting up my own L adapter.

My test transformer secondary is 15Vac (I damaged this transformer so only one pair of 15V secondary winding is working; good for abusive experiment). No load.
Turned on and I saw LED lights and the output Vdc was about 19.9Vdc without adjusting anything yet.

As I switched jumper position, the output Vdc difference is only between 17.xVdc and 19.x Vdc.
Q1: It is supposed to be like this?
And I adjusted the trimpot too quickly and it went down to 7-6-5Vdc etc; both trimpot and LED array unit became extremely hot; then the LED array unit popped.

Q2: What is the relationship between trimpot and jumper setting?
my ultimate goal is to power RPI3...of course.
I got my new transformer-secondary is 2x12Vac.
I will adjust L adapter down to 8Vdc to power the secondary regulatorsx3 (5.1V, 3.3V & 1.8V.)

For the sake of curiosity, I replaced the LED array unit with 10 regular individual LEDs and they worked (leftovers from hotrodded DCB1, good quality clear yellow LEDs from mouser).
Q3: Can the individual LEDs be used in place of the LED array unit?

Sorry too many questions from a newbie
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