Newbie with a question

chevy2410 · 27th January 2006, 10:36 PM

Hey Guys!

I'm putting together my first Gainclone, LM3886 stereo version, and I have a question about the transformer connections. Ok I bought THIS TRANSFORMER and I know that the red, black, orange and yellow wires are the secondaries and go to the terminals on the rectifier board. I know the the grey and brown are HOT and that the blue and purple are NUETRAL. Now I want to add a rocker switch and a 3.0amp fuse. So what I am wondering is do I just tie the 2 HOT wire together as well as the 2 NEUTRAL? Why are there 2 HOT wires and 2 NEUTRAL wires?

Would I go from the L on the A\C to the fuse to the transfromer? Where do I insert the rocker switch?

Thanks,
Chevy

mrlots2do · 27th January 2006, 11:16 PM

Using 120v
1) hot from outlet to switch, to fuse, to gray & brown
2) neutral from outlet to switch (if double pole), to blue & violet
3) ground from outlet to chassis

Best to use double pole rocker switch.
Rocker switch needs to be 250v rated 5a or larger.

I_Forgot · 27th January 2006, 11:19 PM

That transformer has dual 117VAC primaries. You are going to connect them in parallel (assuming you have 117VAC line voltage) as shown on the last page of the .pdf file whose link is on the page you included in your message. The fuse and power switch should be connected to the "hot" side of the power line coming into your amp.

The manufacturer's literature should ALWAYS be your first reference as you can count on the info to be accurate. Unfortunately, you cannot always rely on info obtained from forums like this one. It is often a case of the blind leading the blind...

As you are a self-declared noob, I recommend that you get someone who lives close to you and knows what they are doing with wiring to check what you are doing. There's no future in electrocution.

I_F

chevy2410 · 27th January 2006, 11:55 PM

Quote:

Best to use double pole rocker switch.

The rocker switch is single pole. On/Off. 250v rated 15a

Quote:

neutral from outlet to switch (if double pole), to blue & violet

Since not using double pole, does neutral from outlet to switch still go to blue & violet?

mrlots2do · 28th January 2006, 07:59 PM

Quote:

Originally posted by chevy2410
Since not using double pole, does neutral from outlet to switch still go to blue & violet?

Yes

chevy2410 · 29th January 2006, 07:22 AM

Another question,

On the rocker switch there is 2 teminals. One is copper and the other silver. Which one is HOT?

Chevy

AndrewT · 29th January 2006, 08:21 AM

Hi,
both are hot.
One permanently and the other when the switch is on.

I suggest you put in a short length of terminal strip.
Run you mains cable input straight to it.
Run the hot through a fuse on it's way to the switch.
Bring the switched hot back to the terminal block.
Run your transformer inputs to the terminal block; hot to switched hot and neutral to neutral.
Run a cable from earth to a bolted connection to the metal chassis and NEVER remove this even during testing.
As and alternative run the mains cable earth straight to the bolted earth connection and then bring a cable from bolted earth to terminal block.

chevy2410 · 29th January 2006, 06:25 PM

Quote:

both are hot. One permanently and the other when the switch is on.

Does it matter which one is permanent and which is when the switch is on?

Quote:

Run a cable from earth to a bolted connection to the metal chassis

What?? Sorry I don't follow you.

Quote:

Run you mains cable input straight to it.

What are the mains cable?

Quote:

As and alternative run the mains cable earth straight to the bolted earth connection and then bring a cable from bolted earth to terminal block.

Sorry I don't follow you again.

Also if I get a terminal strip how many terminals do I need to have?

Chevy

AndrewT · 30th January 2006, 09:55 AM

Hi,
before you contemplate working with electically powered equipment you need some training.
Get help and/or supervision.

I do not trust myself to talk you through this process.

mrlots2do · 30th January 2006, 11:33 AM

Quote:

Originally posted by AndrewT
Hi,
before you contemplate working with electically powered equipment you need some training.
Get help and/or supervision.

I do not trust myself to talk you through this process.

I have to strongly agree with AndrewT.

My post #2 was very clear. Since you have a single pole switch then bypass my comments regarding neutral wiring of double pole switch.

Get help before we hear of a serious mishap.

27th January 2006, 10:36 PM	#1
chevy2410 diyAudio Member Join Date: Jan 2006 Location: Abbotsford, B.C. Canada	Newbie with a question Hey Guys! I'm putting together my first Gainclone, LM3886 stereo version, and I have a question about the transformer connections. Ok I bought THIS TRANSFORMER and I know that the red, black, orange and yellow wires are the secondaries and go to the terminals on the rectifier board. I know the the grey and brown are HOT and that the blue and purple are NUETRAL. Now I want to add a rocker switch and a 3.0amp fuse. So what I am wondering is do I just tie the 2 HOT wire together as well as the 2 NEUTRAL? Why are there 2 HOT wires and 2 NEUTRAL wires? Would I go from the L on the A\C to the fuse to the transfromer? Where do I insert the rocker switch? Thanks, Chevy

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27th January 2006, 11:16 PM	#2
mrlots2do diyAudio Member Join Date: May 2004 Location: Philadelpia	Using 120v 1) hot from outlet to switch, to fuse, to gray & brown 2) neutral from outlet to switch (if double pole), to blue & violet 3) ground from outlet to chassis Best to use double pole rocker switch. Rocker switch needs to be 250v rated 5a or larger.

27th January 2006, 11:19 PM	#3
I_Forgot diyAudio Member Join Date: Jan 2005 Location: Phoenix, Az.	That transformer has dual 117VAC primaries. You are going to connect them in parallel (assuming you have 117VAC line voltage) as shown on the last page of the .pdf file whose link is on the page you included in your message. The fuse and power switch should be connected to the "hot" side of the power line coming into your amp. The manufacturer's literature should ALWAYS be your first reference as you can count on the info to be accurate. Unfortunately, you cannot always rely on info obtained from forums like this one. It is often a case of the blind leading the blind... As you are a self-declared noob, I recommend that you get someone who lives close to you and knows what they are doing with wiring to check what you are doing. There's no future in electrocution. I_F

29th January 2006, 07:22 AM	#6
chevy2410 diyAudio Member Join Date: Jan 2006 Location: Abbotsford, B.C. Canada	Another question, On the rocker switch there is 2 teminals. One is copper and the other silver. Which one is HOT? Chevy

29th January 2006, 08:21 AM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, both are hot. One permanently and the other when the switch is on. I suggest you put in a short length of terminal strip. Run you mains cable input straight to it. Run the hot through a fuse on it's way to the switch. Bring the switched hot back to the terminal block. Run your transformer inputs to the terminal block; hot to switched hot and neutral to neutral. Run a cable from earth to a bolted connection to the metal chassis and NEVER remove this even during testing. As and alternative run the mains cable earth straight to the bolted earth connection and then bring a cable from bolted earth to terminal block.

30th January 2006, 09:55 AM	#9
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, before you contemplate working with electically powered equipment you need some training. Get help and/or supervision. I do not trust myself to talk you through this process.