SSLV1.1 builds & fairy tales

diyAudio Chief Moderator
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Too heavy a dummy load. Should be drawing half your CCS to 3/4 is correct. Use a 15R 2W-5W dummy to emulate ~220mA draw, set for 350ma to 450mA CCS. Check voltage drop across R301 to estimate what current you have available to use.
 
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You will have to know what the circuit draws without Tridents since you are about to check without them. I have read that a Buff 2 draws 410mA with Tridents on it. Anyway, keep in mind to have whatever it needs in the end +100mA in CCS reserve. If it takes 200mA for instance, you are OK with 300mA.
 
diyAudio Chief Moderator
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I am not Russ to surely tell you what consumes how much in those modules, but I trust you will make it out in practice. Its shown that your reg works when the currents are at correct proportions, that's enough to start. Good luck.
 
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Soul COME BACK:D

Better & more bass, more transients, more fast, better mids, glorious highs.

No Tridents, No Lifepo batteries, winner Salas BiB regulator:c_flag:

N.B. When your regs are more near the signal is born sounds better;)
 

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Normally 3.3V, but the AVCC throws about 3.5V to achieve better dynamic range. Not shure about the current, but i guess it would be a few mA. I was thinking that the most significant sonic influence would be on the analog supply. That' s why the stock Buffalo II had shunt regs is this position from the beginning.
 
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...quad of green LED's rather than triplet in CCS...

Whoa, that woke it up. E/R=I, 3.25V across R1, R1=5.6 ohms.... 580mA. Dummy load is 12.6 ohms, output set at 5.3V = 420mA to simulate Buffalo 2 w/ Trident regs. (DC Vin is 11.3V, 6V headroom)

One of my CCS LED's glows a bit yellow, anything I should be concerned about? My 5W Vishay's should be here in a couple of days so I'll try those out before any more "quad mods". But, an interesting experiment, and would certainly power my DAC at this point for a test.
 
diyAudio Chief Moderator
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What can I do with you Buffalo guys all over, I talked to Crt for adding a 4rth one in the next run for your convenience.:D They can be red also, to keep the voltage diff a bit tamer. Near 2W burning constantly on your 5.6R, now... Will make a 5W spec very hot in practice. Keep it off PCB distant enough.

One of my CCS LED's glows a bit yellow, anything I should be concerned about?

Better change it.
 
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Normally 3.3V, but the AVCC throws about 3.5V to achieve better dynamic range. Not shure about the current, but i guess it would be a few mA. I was thinking that the most significant sonic influence would be on the analog supply. That' s why the stock Buffalo II had shunt regs is this position from the beginning.

It's linked to your clock frequency. It about 36mA under 3.3v @ 50mhz and should be about 55mA 3.3v @100Mhz
100~150mA shunt reg should be Ok

Thank you guys:)
 
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Well, new current set resistors are in. Good and bad news. Legato supply current is almost exactly where I want it. Positive side is +14.9V@334mA (Rset=5r). Negative side is -13.9V@296mA (Rset=3.3r). These rail voltages put my Legato in the "sweet spot" (VCC/2)-1V . It all looks quite sinister on my chassis, Darth Vader would probably use these regs in his projects. Tried a 2r for Buffalo supply (5.3V), ....runs 650mA, so I plan to back that off. Probably needs about a 2.5r I would guess.

Can't comment on the sound quality because I've done something to the right channel on my Legato, no fault of the supply itself. I won't go into it because this is the BiB thread. I'll try to get it sorted out next week. My solder rework equipment at my workplace far exceeds what I have at home.