I am going to try these resistors. Will mount to a CPU cooler with a fan. Supposedly non inductive and high power.
EBG UXP/300-10RK, High Power Resistor, 10-Ohm, 300W, Non-inductive | eBay
EBG UXP/300-10RK, High Power Resistor, 10-Ohm, 300W, Non-inductive | eBay
That's what I did to make a metal thin film dummy load here (16 x 2w 3.3ohm resistors in series-parallel):
Very low distortion and cheap for a 20W load (run below 32w max which is too hot). However, making a 200w one is more of a challenge.
TPA3255 Zero Zone
Hi amigos,
Can someone help me to connect my RCA connectors to this TPA3255 Zero Zone board ? :
I need to connect my 2 RCA connectors, is the ground wire important ?
Hi amigos,
Can someone help me to connect my RCA connectors to this TPA3255 Zero Zone board ? :
I need to connect my 2 RCA connectors, is the ground wire important ?
An externally hosted image should be here but it was not working when we last tested it.
Apparently balanced inputs ("in-put-L" and "in-put-R"). The two "-" terminals have to be connected to "G" for each of the two inputs. Center pins (rear) of the RCA connectors go to "+" and the two RCA ground terminals go to "G" for each input.
Alternative: Follow red text instructions on the last board photo of this link: Hifi TPA3255 Class D Power amplifier board BTL High Power amp 150W +150W L21-23 | eBay
Alternative: Follow red text instructions on the last board photo of this link: Hifi TPA3255 Class D Power amplifier board BTL High Power amp 150W +150W L21-23 | eBay
Last edited:
You mean like this ? :
But wich input is the right one ? The one marqued in black or the red ?
red = unbalance mode ?
black = balance mode ?
Any idea guys ?
Last edited:
This was taken from the ad...
input: support Unbalanced or balanced
( this board default is set for Unbalanced input. if you want change to balance input. need change two Resistor's direction. checking the bottom Illustrating.)
If this is true, hook up the right rca to IN-PUT-R (your red circle) and the left rca to IN-PUT-L (your black circle). Center pin to of rca to +, ground ring of rca to G.
Mike
input: support Unbalanced or balanced
( this board default is set for Unbalanced input. if you want change to balance input. need change two Resistor's direction. checking the bottom Illustrating.)
If this is true, hook up the right rca to IN-PUT-R (your red circle) and the left rca to IN-PUT-L (your black circle). Center pin to of rca to +, ground ring of rca to G.
Mike
As far I understand your explanation, in Unbalanced mode, the - (negative) is not used ?
UNBALANCE MODE : Is it right ???
Last edited:
Correct! In balanced mode, you would connect the inverted input signal there. In unbalanced mode you leave it open.
Look like a pain to convert the amp to balanced.
Thanks so you confirm that the above pictures is correct ?
Looks correct to me!
Thanks so you confirm that the above pictures is correct ?
Hi Dani,
Your picture is correct with a small extension: The "-" input(s) normally has to be connected (shorted) to "G" (ground). Leaving one of the two inputs lines in a balanced input open will cause hum. Therefore, you short-circuit the other input line ("-") to ground so it does not pick up noise (hum).
I am sorry... I do not understand. Can you explain via a picture like I did above ?
You mean I need to connect the - (negative) to the ground RCA as well ? LIKE THIS ?
Last edited:
I am sorry... I do not understand. Can you explain via a picture like I did above ?
You mean I need to connect the - (negative) to the ground RCA as well ? LIKE THIS ?
Correct! You do not need to take the "-" input wire all the way to the RCA connector - a small jumper to the neighboring "G" pad will do.
A logical reply would be "apparently" but it is unusual. First, you have to make sure that the white noise does not enter via the input from a previous stage.
So, unless you have already done this, disconnect the source and short the amplifier inputs to ground. Still a clear imbalance in the white noise?
If you still have a clear imbalance of white noise, it is likely to be a capacitor that makes unusually much noise in the right channel.