Reflektor-D builds

[orelli]

Hi all,I just build five reflektor d for all my digital items. SSD hard disk, Cubieboard, CDPRO 5v, TPA Metronome and BIII. I build them on teflon board point to point.
K 117 in place of 1k resistor .I'm very satisfied with sound quality. the clear voices and shining highs are the highligths. But also dinamic and sense of being there are outstanding.
I changed my speakers, now I get a 4 way fullhorn biamped and also at very hi spl the sound is clear and without any trace of distortion.
My previous volt regs are Salas 1.2r.
Thanks Nick for another great work!!!

 

[Salas]

Nice to know. Congratulations.

Any pictures?

 

[orelli]

some pictures

 

[Salas]

Looking good. I remember alike Teflon handwork in SSLV 1.0 by a Greek member Marinos, and now I see from you, maybe there was another case or two, but its generally seldom to see.

 

[orelli]

I always work with teflon 2mm thick, cause is relatively inexpensive, easy to cut, don't melt at hi temps and at very hi frequency the dielectric coefficent
matter

 

[orelli]

Is Selectronic closing? Out of business?.
All the items are 40% discounted, but it's impossible to order them.
Any suggest?

 

[Brumjam]

Is Selectronic closing? Out of business?.
All the items are 40% discounted, but it's impossible to order them.
Any suggest?

Yes they're closing/have already closed.

 

[orelli]

thanks Brumjam, I suspected so.

 

[orelli]

Hi Salas, where can I buy R core transformer in Europe, now that Seletronic is closed?

 

[Salas]

I have no idea

 

[euro21]

Hi Salas, where can I buy R core transformer in Europe, now that Seletronic is closed?

ebay?
r core transformer | eBay

 

[orelli]

Thanks for replay, but on ebay there is few voltage choice and the VA is in the lower side,
too small for me.

 

[alazira]

Thanks for replay, but on ebay there is few voltage choice and the VA is in the lower side,
too small for me.

Take a look at VT4C

Audio Catalog

Ideally try to organize a group buy for 10+ for a significant discount.

 

[lykkedk]

Hello here

I am finishing my proto pcb for an "special" ReflectorD build for an RaspberryPi B.

The PI need's 4,75 - 5,25 VDC (Min/Max) voltage, and uses around 400 - 800mA depending on load.

Well i would use IRF9640 instead of the IRF9610 for this setup, and 0,56ohm for Rset for approx. 1000mA CCS according to the buildguide.

Those things was suggested, but i need to know, what the approx. voltage drop will be, when calculating the Vout. I would like 5.10VDC out, but maybe the regulator has to be calculated for 5,30VDC for giving this?

Hope somebody here can answer this?

Jesper.

 

[Dimdim]

Hi there Jesper, I've read that the RPi3, even with no peripherals connected, needs a lot of available current to properly work. The sneaky part is that the high current consumption is not constant - it has very short spikes of high consumption.

Just FYI..

 

[TioFrancotirador]

Hi there Jesper, I've read that the RPi3, even with no peripherals connected, needs a lot of available current to properly work. The sneaky part is that the high current consumption is not constant - it has very short spikes of high consumption.

Just FYI..

Exactly. I would afraid of two things when applying shunt regulator to various load like computer (Rpi3 in this example):
1. high, short current consumption spikes (you would have to set your CCS very high)
2. Assuming 1 is met then I would afraid of huge amount of heat to sink during processor idle times.

 

[lykkedk]

Thanks...

I know, there could be some issuses here, but case is that i need to build 2-3 of them for a new dac i am building (Old AD1856 R2R).

So if this one fails for my RPI B (Which peaks at max 800mA i hope ), i can use it for my XMOS USB to I2s.

Let's see how it goes

Jesper.

 

[lykkedk]

Hey here

First fireup on this shuntreg. was success

First setup is loaded with 5.04 / 20 ohm = 250mA

The voltage (5.04 VDC) is excatly was the LED's *2 + 1.22 was giving me. I was not thinking, that there was no voltagedrop, but is it right that this voltage will be stable until CCS (0.61/0.56=~1000mA) is reached ?

I will find another resistor, and try to load the reg. a little more now.

But! --- It is getting hot But with some good sinks, it will be doable i think; my transformer is delivering 12vac, which does not make things better.

Anyway i now know that my pcb is working, just wishing i had a scope right now

Jesper.

 

[Salas]

Hey, its ticking. The more loaded the less heat from the output Mosfet. For output voltage drop don't expect a lot. Can't say how much in your arrangement, depends on heat proximity to the four BJTs mainly. Load it heavier and see.

 

[Salas]

P.S. Don't forget to temperature check the bridge diodes, its 1A or more you run CONSTANTLY there. No different hardship than for a bridge in a Class A high bias amp.