Reflektor-D builds

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#1,186
Reflector-D transformer sharing

Hi here fellow diy'er 🙂

As i had some accident's, i think i rather ask a few times more, than less!

I am planning to use a transformer with two secundarys (call them A and B)

If you look at the drawing, it is much easier to understand what i am trying to do. -Is it okay this way ?

Regards; Jesper.
 

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#1,187
I don't think you can do that.
You can have sec A feeding one regulator via a PSU.
You can have sec B feeding one regulator via a different PSU.
You can series connect these PSU to create a dual polarity supply.

That leaves you short of any Secondaries for the 5Vdc and 3.3Vdc supplies
 
#1,188
I agree with AndrewT.
You should use transformer with 3 secondaries in such case.
Also I would not mix powering I/V (analog) with Xmos (digital) on same 5V line.

However ideally in your case I would use two transformers with two secondaries each and have four reflectors:
One transformer for with two secondaries to power 5V line for xmos and 3.3V line. (digital section)
Second transformer with two secondaries to create -/+5V for I/V. (analog section)
 
#1,189
#1,190
Hello,

I have build a Reflektor D with 1ohm CSS resistor, and I want to power a Beagle Bone Black. With a dummy resistor I have 5,24V and the LED's are lighting fine. If I connect the BBB, the board is working fine, but the Reflektor's LEDS is not working and I have only 4,32V. It is that normal?
 

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#1,191
stefan646 said:
Hello,

I have build a Reflektor D with 1ohm CSS resistor, and I want to power a Beagle Bone Black. With a dummy resistor I have 5,24V and the LED's are lighting fine. If I connect the BBB, the board is working fine, but the Reflektor's LEDS is not working and I have only 4,32V. It is that normal?
Click to expand...
No it does not seem normal, indicates current starving in the reg. The BBB must be asking more mA than available. Try a 3.3R across the 1R to boost the current by 200mA more and see.
 
#1,192
Salas said:
No it does not seem normal, indicates current starving in the reg. The BBB must be asking more mA than available. Try a 3.3R across the 1R to boost the current by 200mA more and see.
Click to expand...

Hello Salas,

You are right, it is a current problem, but I don't understand why. User Palmito used his BBB with the ReflektorD and he reported a power consumtion of about 450mA. Instead of 1ohm I put a 0,75ogm resistor, the LED's are now lighting normally, but from time to time they fade. I measure the current and the average is about ~0,75A with spikes of 0,82A(when the LED are fading). I don't understand why it drains such more power. I have a back-up battery connected to the BBB but I don't think that whill make the power consumtion difference. The odd thing is that the board with the battery connected to the USB port of the computer is working fine, and the USB port should have a maximum 500mA current.
 
#1,193
Hello Salas,
I have a question regardings CM in DC Flexy. From what I see in your documentation, you suggest 6800uF for CM, but there are no mention about voltage for CM. If I want to use it to power one Reflektor mini board with output max 450mA, what is your recommend voltage ratings for CM, 25V, 50V or 63V?
 
#1,194
stefan646 said:
Hello Salas,

You are right, it is a current problem, but I don't understand why. User Palmito used his BBB with the ReflektorD and he reported a power consumtion of about 450mA. Instead of 1ohm I put a 0,75ogm resistor, the LED's are now lighting normally, but from time to time they fade. I measure the current and the average is about ~0,75A with spikes of 0,82A(when the LED are fading). I don't understand why it drains such more power. I have a back-up battery connected to the BBB but I don't think that whill make the power consumtion difference. The odd thing is that the board with the battery connected to the USB port of the computer is working fine, and the USB port should have a maximum 500mA current.
Click to expand...

Hello

I can't answer the BBB conundrum of consumption from no experience with it, maybe remove the battery first to see if it badly interacts with the Ref-D, but when you measure a certain peak current demand its really there and you must set the CCS properly for it. Add another 100mA margin via the setting resistor if nothing changes in the end I would say.
 
#1,195
trung224 said:
Hello Salas,
I have a question regardings CM in DC Flexy. From what I see in your documentation, you suggest 6800uF for CM, but there are no mention about voltage for CM. If I want to use it to power one Reflektor mini board with output max 450mA, what is your recommend voltage ratings for CM, 25V, 50V or 63V?
Click to expand...

25V is more than enough but the higher the voltage characteristic in an electrolytic capacitor the better its parameters in general. So if it still fits the mounting dimensions and a price difference is no object for you prefer the higher voltage spec between electrolytics of same brand and type.
 
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