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Hairball Audio 1176 Compressor Build Stage 5

Hairball Audio 1176 Compressor Build Stage 5

The final thing I do is to wire up the ratio board with the correct lengths of coloured wire as per Mnats instructions. Some of the colours are different due to what was available to me but as long as you are keeping a note of what colours you have switched you’ll be fine. You can see from the picture that the wires are fairly tough, straight wire – this is the smallest gage hookup wire I could get at Maplin as the holes on the ratio board are quite small diameter. In my first build I had to cut away some of the copper wires to fir them through the hole so hopefully this will make a better connection. The only problem with this wire is that the shield melts very easily when soldering but a bit of practice goes a long way! You can see from the picture below that the hookup of the ratio board with the attack and release pots is fairly complex  so take your time but if the wires are the right lengths then you shouldn’t have any issues. The toughest bit I find is where you have to suspend wires, a capacitor (with very short legs) and also a resistor on the attack pot and solder them all together – I find one of those leg tools with clips on very useful at this stage. At this point you should be ready to simply hook all the other cables to the molex headers on the main PCB  to make the connections before the final stage – the meter circuit board and the...
Hairball Audio 1176 Compressor Build Stage 5

Hairball Audio 1176 Compressor Build Stage 4

At this point you can start to stuff the main PCB. It’s a really good idea to stuff the power section of the board first and also hoookup the power transformer so that you can test your power rails and make sure you don’t blow the board. This will also save some heartache later on if things don’t work and you have to start troubleshooting…… First I hookup the power transformer: Next I stuff the power section of the PCB ONLY: Then once you have checked your power rails, you can stuff the rest of the board: ….and then mount the PCB in the chassis: Next will be the ratio board and main...
Hairball Audio 1176 Compressor Build Stage 5

Hairball Audio 1176 Compressor Build Stage 3

Okay so the next stage is to get the switch units connected up. The Hairball audio compressor kit comes with 2 switch units, one for the meter switches and one for the ratios. The pack also comes with 2 mini PCBs for the switch assembly. Solder on the required resistors and then solder in the switches themselves as per the photos below: The next stage that I do as this point os to wire in the XLR input and output and also hook up the input transformer and hook that up ready for the main PCB: Next we can solder the main input section of the PCB and also hook up the power transformer and test that it’s working before populating the rest of the PCB……....
Hairball Audio 1176 Compressor Build Stage 5

Hairball Audio 1176 Compressor Build Stage 2

So once you’ve unpacked all the parts to your new 1176 clone what next?? The first thing I do is to assemble the sides, front and back of the chassis as per the picture below: It’s imperative to test the chassis for continuity at this point as well, to make sure that all sides of the unit make contact so that it will earth properly. I use a continuity tester with an audible ‘beep’ and test at various points. You may need to scrape off some paintwork at the screw holes to make sure there is adequate contact. The next things to do is to fit the VU meter, the IEC socket and the power transformer. I put these on first as the first stage in the PCB build will be the power stage to check that’s right before stuffing the rest of the board so it’s handy to have the power stage ready. I only loosely fit the power transformer as you will need to move this around as and when you start wiring up but it helps to start getting everything in place. I also add the VU meter at this stage as it’s really fiddly to fit last when the switch PCBs are mounted. I also fit the “0” adjust pot now as well. See pictures below. The last thing I do at this stage is to mount the output transformer on the chassis. This is so that the PCB gets mounted at the right position in the case to facilitate wiring up without having to extend the output wires etc. That’s it for now. The...
Hairball Audio 1176 Compressor Build Stage 5

Hairball Audio 1176 Compressor Build Stage 1

I love 1176 compressors. So much so that I have already built 2 Blackface Revision D 1176 clones from Hairball Audio Now I will document here the new build of my Revision A Silverface 1176. First – unpacking everything!! This shot show the box plates and all the bags you get direct from Mouser – bags full of capacitors, resistors, diodes and transistors. This may look a little daunting but there is nothing more rewarding than creating your own hardware. Hairball Audio have a full step-by-step process on their website which makes the whole process way easier than it would be ordinarily. Remember – I had never done anything like this before and built 2 working units so anyone can do it! Check back for progress!...