[BUILD] 1176LN Rev D DIY

[studiostuff]

Just a quick note to say thanks to Hairball and MNATS for the great Rev. D kit and board!!

With all the material out there, especially this thread and the wiring guide and setup videos, I was able to get my kit assembled and flying with no problems. I did have to read some things and watch some of the videos more than once before it all soaked in... But I got it done and it sounds great.

I may get another to see if I can improve on the look of the wiring job. It was fun and pretty easy to do. Thanks again!

 

[Sillen]

Do you think the reason my compressor don't seem to get any power is because the wires from the transformer going into the screw terminal is totally tinned?

/Isak

 

[sr1200]

Def not. I usually tin any wire that goes to a screw terminal.  Never had an issue with that, infact it saves the wire from getting frayed.

 

[Harpo]

Do you think the reason my compressor don't seem to get any power is because the wires from the transformer going into the screw terminal is totally tinned?

Measure AC mains voltage arriving at the back side of your IEC socket. No voltage showing up, the fuse fitted inside the IEC connector is broken or missing.

 

[Sillen]

I wouldn't be exactly sure where to put the probes. I'd have to remove the heat shrink from the wires to be able to measure that right?

I tried to measure at the back of the IEC now and got a result of about 237 volt ac which I suppose is legit? And when I measure it going into the closed terminal or whatever it's called (back of the bypass button) i get the same result. -- 237 v ac from transformer primaries as well.

 

[sr1200]

If you have the wires going into screw terminals you can measure at the screws of the terminal.

 

[Sillen]

If you have the wires going into screw terminals you can measure at the screws of the terminal.

Measuring the screws gives me a result of arround 1 v AC. Do you think my transformer is broken? ://

 

[exspence]

Hey,
I could be wrong, but when it comes to wiring the secondary, two documents are contradicting each other. Mnats wiring guide states " Just make absolutely sure you have tied the two 0V ( Center tap) wires together." In my case, this would be BLK and ORA. The hairball document states "The end of winding 1 and the start of winding 2 are tied together." This would be Red and ORA. I've attached an image of my transformer for reference. I'm in Canada, so I will be wiring the primary in series. Lastly, my transformer is dual secondary, ordered from Hairball, but the guide says to wire it as center tapped?

Best,

Spence

 

[mnats]

Hey,
I could be wrong, but when it comes to wiring the secondary, two documents are contradicting each other. Mnats wiring guide states " Just make absolutely sure you have tied the two 0V ( Center tap) wires together." In my case, this would be BLK and ORA. The hairball document states "The end of winding 1 and the start of winding 2 are tied together." This would be Red and ORA. I've attached an image of my transformer for reference. I'm in Canada, so I will be wiring the primary in series. Lastly, my transformer is dual secondary, ordered from Hairball, but the guide says to wire it as center tapped?

Best,

Spence

You're wrong. If you're using the Avel-Lindberg transformer sold by Hairball there is a page linked from the text that specifically refers to that transformer. But if you're using the generic page you have quoted out of context as the text refers to Mark Burnley's illustration, not any other diagram.

 

[Spendor]

Hi all - I'm building a REV D rotary version. All seems OK regarding voltages and I went through calibration OK. My problem is I have SO much gain! If I turn the output pot past 9 o'clock its audibly hissy.  It all seems in the output stage  - I'm using a 250k log pot. Is this correct for the rotary version? I haven't installed a trimmer on the ratio board - is that OK? Thanks

 

[sr1200]

The pair i have are pretty hot too, and so was the old UREI one I used to use.  I took that as pretty normal, but 9 o'clock seems kinda early for that to start happening.  Mines usually around 12 or 1 it gets unbearable, but it also depends on where you have the input gain set, dont forget the unit is a fixed threshold and cranking the input gain isn't really warranted (for what i do at least).

 

[Sillen]

Could anyone tell me how to figure out if my power transformer is broken? Barely no ac (1-2 v) is coming through the secondary windings.

 

[Harpo]

Could anyone tell me how to figure out if my power transformer is broken? Barely no ac (1-2 v) is coming through the secondary windings.

Probably not as long as you don't tell us what type/model your mains transformer is and how you hooked it up. Colour coding of transformer wires is not standarized.
Barely no secondary AC (1V-2V) already tells you, the transformers primary connection might be OK (a dual primary winding could still be wired out of phase), but else nothing would arrive across its secondary winding connections.

 

[Sillen]

Could anyone tell me how to figure out if my power transformer is broken? Barely no ac (1-2 v) is coming through the secondary windings.

Probably not as long as you don't tell us what type/model your mains transformer is and how you hooked it up. Colour coding of transformer wires is not standarized.
Barely no secondary AC (1V-2V) already tells you, the transformers primary connection might be OK (a dual primary winding could still be wired out of phase), but else nothing would arrive across its secondary winding connections.

I'm using the transformer provided with the Hairball audio kit (Avel Lindberg 2X25 30VA dual primary/secondary toroidal power transformer) Wired the primaries as described in its dedicated guide. Wired the secondaries 0volt windings to the centre of a screw terminal and the other two remaining windings to their own place in the screw terminal. I just checked it over again and i'm almost totally sure it's correct. The only thing i'm not sure of is if the screw terminal I bought in a local store works for this but I assumed all screw terminal blocks were the same. Are they?

 

[Harpo]

I'm using the transformer provided with the Hairball audio kit (Avel Lindberg 2X25 30VA dual primary/secondary toroidal power transformer) Wired the primaries as described in its dedicated guide. Wired the secondaries 0volt windings to the centre of a screw terminal ...

Dual secondaries have NO 0V winding. This is only an indicator where a winding starts in respect to its other end. You have to read the complete sentence of the dedicated guide, IE follow the illustration from Mark Burnley or have a look at the datasheet for your transformer.

 

[Echo North]

Wired the primaries as described in its dedicated guide. Wired the secondaries 0volt windings to the centre of a screw terminal and the other two remaining windings to their own place in the screw terminal.

This is not at all what it says in the guide.

http://hairballaudio.com/docs/FETGUIDE/Section%20D%20-%20Power%20Section.pdf

Look at the images of the windings on the left of page 9.  Look at your Avel transformer windings.  Does that say to tie the "0V" leads together?

 

[Echo North]

I'm in Canada, so I will be wiring the primary in series.

I was born/grew up in Canada.  Canada has 120V main voltage.  Wire your primary in parallel.

I could be wrong, but when it comes to wiring the secondary, two documents are contradicting each other. Mnats wiring guide states " Just make absolutely sure you have tied the two 0V ( Center tap) wires together." In my case, this would be BLK and ORA. The hairball document states "The end of winding 1 and the start of winding 2 are tied together." This would be Red and ORA.

The error is on the Avel Transformer winding images.  It's misleading.  See Harpo's post below.  There is no "0V" lead.  It's Avel's really misleading and shitty way of indicating polarity.  IGNORE the 0V labels on the Avel transformer.  You're creating a 0V CT reference by using the end of one winding and the beginning of the other.

I'll clarify this on the build guide.

Mike

 

[Echo North]

OK, so I guess I am being stupid, but I compared transistor voltages today to the actual MNATS ones. My Q11 aND Q12 are off and everything else is right within reason. Anyone have ideas of what might be amiss? I know Echo North won't be back until Monday... My "10.56V" is more like 17V, and the "9.26V" on Q12 is more like 16-17V as well...

Still not passing audio?  I'd put your unit in GR OFF mode and don't even worry about anything in the Meter or GR AMP section until you get audio passing.

Did you trace the signal through the unit?

Mike

 

[tazman]

Hi - my 1176 Rev D has been working great for 2 years and now all of a sudden it's acting very strange.  While being used it's as if the amount of compression changes and you can see it in the meter as well.  It's almost like the threshold is changing  from one setting to another one.  Any suggestions as to where I could start the troubleshooting process?

Thanks,

Rob

 

[Spendor]

Hi all - I'm building a REV D rotary version. All seems OK regarding voltages and I went through calibration OK. My problem is I have SO much gain! If I turn the output pot past 9 o'clock its audibly hissy.  It all seems in the output stage  - I'm using a 250k log pot. Is this correct for the rotary version? I haven't installed a trimmer on the ratio board - is that OK? Thanks

Sorry to ask again - I think my problem is also related to the fact that if I connect a 1k 0db signal to the input it suddenly drops to approx 0.25 V ! This happens regardless of whether the unit is switched on or off and even if i bypass the input transformer and T-pad. Any ideas? Thanks.