wiring up a transformer (brian gts kit)

[fusion]

After soldering up the kit i bought from chipamp.com im pretty eager to test the power supply boards and see if I get the right output from em.

problem is i bought the dual mono kit and have two psu boards... and one transformer with 3 sets of 2 wires. blue and brown are input then i have the pairs of red and black then yellow and orange.

im not sure how to wire these to the ac1 ac2 inputs of BOTH boards. did i need two transformers or does the 3 sets of 2 wires mean i can use both boards with one transformer?

officially confused,
richard

[AndrewT]

Hi,
yes, wire up both PSU boards to BOTH sets of secondaries.
The power ground coming from each PSU board will be separate from each other.
I suggest you keep the dual mono set-up and retain the separate audio ground between the channels as well.

When you get around to making this dual mono set-up safe to use you will need to connect the two separate channel audio grounds to the Safety Earth.
I suggest you try using two independent disconnecting networks to make the safety connections. If this fails to give low noise, then direct connection between the audio grounds and Safety Earth may be better but this relies on very close/very short grounding connections between the channels and this can be difficult to achieve.

If all these options/solutions fail to meet your standards then twin transformers is your next route.

[fusion]

might sound stupid but my problem is that i dont know which colours are ground i can guess but... and i dont know what one to connect to either ac1 or ac2 on brians kit....

thanks for the help anyway it was useful

[AndrewT]

Hi,
Firstly, build up a mains light bulb tester.
Use it to power up every project for the first time to avoid expensive/dangerous failures due to mis-wiring. And keep it for powering every time you modify any project.

Identify which secondaries are connected together.
One pair go to AC1 and the other pair go to AC2.

[fusion]

so negative and positive of one secondary go to one ac. (ac1) then the other to ac2...

erm ive got two psu boards which is where i get confused....

thanks again

[Evilsizer]

it sounds like you just need to solder a set of wires to AC1,AC2,ACG1,ACG2 on the transformer or get another transformer.

[AndrewT]

Hi,
don't call your AC wire connections positive and negative. That will confuse both you and us.
Flow and return, or Hot and cold, or Live and Neutral are acceptable alternatives that get adopted depending on context. I'm sure there will be other names that get used and are less confusing.

[Evilsizer]

info on how to wire one transformer to psu PCB is what he needed. even i see that from the first post. not tring to confuse anyone.... at the rate you were giving answers it would have prolly taken 2 more of your posts for him to finally get his answer.

[danielwritesbac]

Originally posted by fusion
so negative and positive of one secondary go to one ac. (ac1) then the other to ac2...

erm ive got two psu boards which is where i get confused....

thanks again

In that case, its perfectly fine to use just one PSU board. Do, however, make the cables to amplifier 1 exactly the same length, and exactly the same length as to amplifier 2.
It isn't necessary to braid, but do keep the hot lines within 1/4" or closer to the ground lines (close to each other).

I have absolutely no idea how to wire the common ground to the case if using a stereo pair and a torrid transformer. Can someone help out here?

[audio1st]

Originally posted by fusion
so negative and positive of one secondary go to one ac. (ac1) then the other to ac2...

erm ive got two psu boards which is where i get confused....

thanks again

I have attached a picture which should give you a clue how it could look..
There should be a picture on the side of the transformer which you should use to check the colours are the same..
The metal case (if you use one) should connect direct to the mains earth. Both of the ChG's (channel Grounds), should also connect to earth . If it hums then check other threads for info.
Please follow info about safety posted by AndrewT..