I have seen various sites on the internet showing how to build a clone of the UREI 1176 compressor, some better than others. These are suggestions culled from Microphone-parts.com This kit includes components for the 1176 module of our 4-channel frame system. How To Get Started Making Your Own 1176 Compressor. The Gyraf clone has been designed around "European" transistors which generally start with a BC or BD rather than the 2Nxxxx of transistors commonly used in the USA. Semiconductors This hum problem had been solved with the Gyraf Rev #7 boards by running a heavy ground buss soldered to the ground trace lowering the resistance of the track to a point where the hum was nearly eradicated. It was played through an ancient Panasonic SL-S160 CD player through the headphone output into a hastily-made mini-jack to XLR cable, into the 1176 clone with the cover off, the toroid not yet tweaked and the screening can off the output transformer set at the 3/4 mark on input and output with the gain reduction off (passing through all audio stages) out through an equally quickly made XLR-F to mini cable straight into the line in of my Sound Blaster Live! It has been inferred somewhere (the old forum?) Then I checked a source in the US: In April 2004, RS UK listed the OEP transformer for �9.80 or $23.50 Australian dollars. A quick scan of the Rev 7 layout revealed a literal loop where the ground trace ran all the way around the perimeter of the board. *However, I know that many builders have access to or have already obtained these rare devices. Questions? That's about 25.5 times the price of the same part from Mouser at current exchange rates. Lundahl output transformer is installed 'reversed' to increase gain to the equivalent of the original UREI 1176. 5 Knob Compressor Kit Instructions Warranty: BYOC, LLC guarantees that your kit will be complete and that all parts and components will arrive as described, functioning and free of defect. Ratio and Meter Switch Layout (21kB PDF File) I don't agree with the assertion that it is a difficult home-etch; it certainly isn't as troublesome as Gyraf's SSL Mixbus Clone layout in that sense. The ability to mount BD135/136 or BD139/140 output transistors without crossing leads and using shrink tubing or mounting them with an unsightly twist. BD135/136 Version (substitute output transistors) This is a board that evidently is commonly found in pre-sensitised form in the European Union and elsewhere. PCB Grinder provides kits and PCBs for beginner friendly pro audio DIY. The OEP A262A2E has been named as a alternative part for the output stage. I tend to take such claims with a grain of salt. Version F1 Copper Layer (46kB PDF File) It also uses an IC opamp for the meter driver stage rather than the bipolar transistors used in earlier versions. Pre-etched boards are available (see the Manufactured 1176 Clone Boards page for more board details on the latest revision). However, I had a few problems with the Gyraf Revision 7 printed circuit board. Jaycar 7824 Farnell Australia FDH333 While the cost of living is generally low in Australia, many specialty or luxury items are priced well beyond what would be considered reasonable elsewhere. Nor do I believe that it is difficult to stuff the board with parts as others have suggested. Fax +61 - (0)2 - 9368 7199 Wes-Wagner BC107, BC560C, BD135, In April 2004, RS UK listed the OEP transformer for �9.80 or $23.50 Australian dollars. So I have created a version that incorporates all the other features listed but uses the BD517/518 pair. It has a characteristic quality that remains popular to this day. DIY kit available for £149. Newark in the US sells them for $19.34 or around $26 AUD. Dick Smith NONE 100 William Street I don't agree with the assertion that it is a difficult home-etch; it certainly isn't as troublesome as Gyraf's SSL Mixbus Clone layout in that sense. Revision H Checkplot They have the same pinout as the BD135/136 and so are interchangeable on my board. No tubes, but a nice solid-state do-it-yourself project. Version F Layout (96kB PDF File) Revision H Copper Layer Mouser offers freight using US Postal Service at relatively low cost - check shipping options carefully when ordering as the default methods can be fairly expensive. Audio Maintenance Limited make a selection of DIY audio kits. and first built in 1967. It seems to have been worth the effort. Version F1 Layout (97kB PDF File) Nor do I believe that it is difficult to stuff the board with parts as others have suggested. The power supply caps do get a little squeezy but they still fit flush with the board. Star grounding scheme isolating the various sections of the circuit and bringing them separately to the star point beneath the output transformer for elimination of hum. None of the optional bypass or filtering caps were installed (though I have included all pads on my layout). OEP is installed natively (its ratio is 1+1:2+2 primary to secondary) for the same result. Three styles of trim pots can be installed on the one board and in any combination. If you would like to etch your own, Version F (Eurocard) files are available here: Later it was suggested that a wire be run from one side of the board to the other, soldering it where the hum was at its minimum. I burned it onto a CD with about 5 seconds of silence then the door slam to give an idea about levels and noise. Given the popularity of the Gyraf design, keeping it similar rather than creating an entirely new design seemed sensible. Version F1 Layout (97kB PDF File) They are easily available and are the same transistors Lab Member IJR apparently used in his version of the 1176. Mouser offers freight using US Postal Service at relatively low cost - check shipping options carefully when ordering as the default methods can be fairly expensive. It has been inferred somewhere (the old forum?) As always when building DIY equipment, the most difficult part is securing the components with which to build the thing in the first place. Partial Kits. All this meant that the PCB would have to be redesigned although not too extensively. They aren't interlocked like the original so you have to push one off before pushing another one. Its just an 1176 style compressor, but if you absolutely must know, it is derived from Jakob's Gyraf rev F, which is the exact board and layout that Mnats' (Hairball) used for his rev F. Quote: Originally Posted by kiopo. BD517/518 Version (originally specified transistors) Star grounding scheme isolating the various sections of the circuit and bringing them separately to the star point beneath the output transformer for elimination of hum. Here's what's included with the kit: You can see an example of the assembled module (this is an illustration, the kit contains components in the list only). But later I did and found out that the Australian distributor actually sells them for a price very much in line with the rest of the world: Control Devices Sydney - $65 + GST, $15 + GST shipping; Canford UK �29.14 = 69.87 AUD; K&K USA $48 USD = $62 AUD. that the BD517/518 output pair in the Gyraf version were chosen for their 'sound'. that the BD517/518 output pair in the Gyraf version were chosen for their 'sound'. The power supply caps do get a little squeezy but they still fit flush with the board. The class AB used in the Gyraf version is simpler (because a special transformer is not required) and great for DIY. It is an adaption of the original UREI 1176 LN to components and parts that are available (mostly) everywhere today. BD136, BF245 (no suffix listed but apparently 'A') Depending on which schematic you refer to and which option you choose, the input stage is based either on Rev. RS Australia BC107, BF 245A, BD135, BD136, NE5532 But later I did and found out that the Australian distributor actually sells them for a price very much in line with the rest of the world: Control Devices Sydney - $65 + GST, $15 + GST shipping; Canford UK �29.14 = 69.87 AUD; K&K USA $48 USD = $62 AUD. There doesn't seem to be an easy way around that one. Level 6, Westfield Towers Australia Kalex BC107, NE5532, 7824 While the cost of living is generally low in Australia, many specialty or luxury items are priced well beyond what would be considered reasonable elsewhere. If you would like to etch your own, Version F (Eurocard) files are available here: There is very little, if any, audible hum. Version F Layout (96kB PDF File) It seems to have been worth the effort. If you want to build the G1176, I would suggest you order from Mouser which has all the semiconductors and indeed most of the other parts required for the build. BD139/140 in Modified Board The ability to mount BD135/136 or BD139/140 output transistors without crossing leads and using shrink tubing or mounting them with an unsightly twist. A version for the originally specified BD517/518 pair with all the following modifications also exists. Mouser (USA) FDH333, BC107, BF245A, BC560, BD135, BD136 All PCBs, all metalwork, hardware (screws/nuts/standoffs etc) & any hard to get parts. So I also designed two additional boards using cheap pushbutton switches. Australia Jakob suggested a solution and step-by-step instructions were published on the now-defunct Tech Talk DIY Forum by deanp920 (recovered and republished at The Lab). OEP is installed natively (its ratio is 1+1:2+2 primary to secondary) for the same result. The last and most important major problem I wanted to overcome was the tendency for the clone to hum. Then I checked a source in the US: Control Audio Pty Ltd In April 2004, RS UK listed the OEP transformer for �9.80 or $23.50 Australian dollars. For no other reason than aesthetics, I also wanted to use push buttons like the original. So I also designed two additional boards using cheap pushbutton switches. I started making a list of sources for transistors and other semiconductors in Australia: card. A version for the originally specified BD517/518 pair with all the following modifications also exists. I believe the sound of the line amplifier has more to do with topology than the selection of individual transistors. The Klontz 1176 Rev A clone is a nice showcase of a custom built compressor by, Klontz (in the style of the popular kits available on the DIY forums). A version for the originally specified BD517/518 pair with all the following modifications also exists. But later I did and found out that the Australian distributor actually sells them for a price very much in line with the rest of the world: Control Devices Sydney - $65 + GST, $15 + GST shipping; Canford UK �29.14 = 69.87 AUD; K&K USA $48 USD = $62 AUD. This kit includes components for the 1176 module of our 4-channel frame system. A classic FET compressor. Because I had them lying around I decided to use a BD139/140 pair. Mouser offers freight using US Postal Service at relatively low cost - check shipping options carefully when ordering as the default methods can be fairly expensive. They are easily available and are the same transistors Lab Member IJR apparently used in his version of the 1176. Wes-Wagner BC107, BC560C, BD135, Because I had them lying around I decided to use a BD139/140 pair. Kalex BC107, NE5532, 7824 For no other reason than aesthetics, I also wanted to use push buttons like the original. Take, for example, the FDH333 diodes. Pre-etched boards are available (see the Manufactured 1176 Clone Boards page for more board details on the latest revision). Sure you need a little skill but if skill is a problem you should probably think about buying one pre-made anyway. RS in Australia sells the BC107 for 2.11 AUD; Mouser's price is 40 cents US. Revision H Checkplot When you add the screening can and courier shipping (of which you have no alternative) the transformer ends up costing nearly $80 AUD! It's also worth remembering that the original used different transistors altogether. Additional pad for stereo interconnect between two units. While I had reservations at first about the Gyraf design - in particular the orientation of parts seemingly only to avoid the need for any wire jumpers - my admiration for Jakob's design only grew as I began "connecting the dots".
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