Reflektor-D builds

[merlin el mago]

Yes, more organic sound, now not sound digital, is incredible what you do, congrats and thanks to share your magic work with us.

 

[Salas]

Is that your Lambo Salas?!

Maybe you could design a simplistic shunt regulated Lambo for us?!!

I am a man of slender means so I only got a few thermionic lamps to design stuff, not Lambos, still the matte black hue seems to be in style.

 

[Salas]

Yes, more organic sound, now not sound digital, is incredible what you do, congrats and thanks to share your magic work with us.

 

[merlin el mago]

I don't know how do you do, but please don't stop to design audio....

 

[merlin el mago]

Peace, rhythm, music, relax, enjoyment....

 

[merlin el mago]

My tx is a R-Core 9VAC 30VA guide said fused 750mA slow blow (T) fuse, have I to use the same value?

 

[Salas]

That value is for safe in line DC fed test. For primary AC fuse whatever the Tx asks for. If it does not have spec on label or on some website, 160mA time lag fuse at 230VAC wall power would be rather normal for a 30VA nominal power transformer (300mA primary time lag fuse in USA).

 

[merlin el mago]

Thanks Salas, I'm waiting the long winter....

 

[merlin el mago]

Can be fused between the psu & reg, how to calculate to protect the reg? something related the value of CCS?

 

[Salas]

Better fuse any Tx primary anyway. Its for nothing catches fire rules of safety. For inline DC fuse like in power amps rails you can monitor the current peak by DMM in DC(A) series mode between incoming DC+ and DC input+ reg. Watch both power on and settle level draw. Then fuse with a fast fuse at +10%.

 

[merlin el mago]

750mA can be enough for R-D

 

[CeeVee]

Ok here goes my first test:

I made my own PCBs for this one because i needed power transistors on the side and because i needed a more compact layout.

2SK117 GR - idss 5.1mA
R1 - 1ohm Caddock MP915
RR - 82 ohms
Filter cap - 10000/16V Nichicon
2 green leds ( 1.90V each )
Rectifiers - MUR 820
Transformer - Selectronic R core 230V primary, 9+9 secondaries.

measurements with load:

Load - 11 R ....for 450 ma load current.
AC in - 11V
DC at Filter cap - 12.3 V

Output - 5.06V at switch on, 4.99V after 10 minutes, 5.00 V after 45 minutes

So i guess it is stable after 10 min!
Heatsink - just a little warm.

 

[Salas]

Those Selectronic are always happier for secondary than nominal. But no big deal when on external sinking. Drift is very small. Success.

 

[CeeVee]

Thanks to you Salas !

 

[Salas]

For what application are they made for? BIII?

 

[CeeVee]

Yes for the BIII I am using with the SDTRANS and SEN IV.

All in one box with a matching one for PSU.

Already played in rats nest test jig and sound was spectacular...i was using BIB at the time.

 

[merlin el mago]

Congrats.

 

[merlin el mago]

750mA can be enough for R-D

Salas is OK?

 

[Salas]

When using external DC feed, not the onboard rectification and big capacitor, there is no power on current surge at that circuit point. So when you had set 700mA CCS, 750mA DC line fuse should not break under normal condition. Did you see any high peak with your A meter at that point during power on?

 

[merlin el mago]

No, I not measured nothing, it's only to protect the R-D. Isn't necessary to fuse?