Though BC/BD devices are generally common in Australia the particular ones used in the 1176 clone aren't. Firstly, the output transistors specified are no longer in production and are therefore difficult to obtain*. I have gotten too busy with www.goly.dk to tend to the kits properly, and feel it is the best decision for now. Documentation, BOM’s, and build support for DIY projects can be found in the lab at prodigy-pro. Users reported excessive hum which was traced to ground loops occurring within the PCB itself. Version F1 Copper Layer (46kB PDF File) OEP is installed natively (its ratio is 1+1:2+2 primary to secondary) for the same result. The original Gyraf Rev 7 board dimensions are 160mm x 100mm - a format apparently called a "Eurocard". It has been inferred somewhere (the old forum?) If you would like to etch your own, Version F (Eurocard) files are available here: Email: sales/AT/controldevices/DOT/net 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. 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. The same item from RS Australia costs $39.10! The OEP A262A2E has been named as a alternative part for the output stage. BD517/518 Version (originally specified transistors) ... All SA-3A Full Kits and SB4001 orders are automatically insured at no additional cost. Pre-etched boards are available (see the Manufactured 1176 Clone Boards page for more board details on the latest revision). Revision H Checkplot 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. They are easily available and are the same transistors Lab Member IJR apparently used in his version of the 1176. Listen in As a long time builder of audio equipment, I can attest to the quality of the components supplied, especially this latest version. Though BC/BD devices are generally common in Australia the particular ones used in the 1176 clone aren't. It also uses an IC opamp for the meter driver stage rather than the bipolar transistors used in earlier versions. DIY Universal Audio (Teletronix) La2a Compressor: New - Updated La2a Layout and Documentation by Gambaholic: There are 2 versions of each layout and there are layouts for the UA LA2A and the UREI 68' (both with a companion heater wire layout as you did). I secured permission from Jakob to base a new design on his Rev 7 board and set about laying out the parts visually in Protel Autotrax using custom components I had created. and first built in 1967. Classic 1176 schematic/parts. DIY kit available for £149. BD136, BF245 (no suffix listed but apparently 'A') By far the most complete description is Jakob Erlund's Gyraf Audio DIY version. Email: sales/AT/controldevices/DOT/net To hear my nearly finished clone with the modified board playing silence for 5 seconds, then a door closing, click here (151kB mp3 file). BD136, BF245 (no suffix listed but apparently 'A') Dick Smith NONE 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. Semiconductors None of the optional bypass or filtering caps were installed (though I have included all pads on my layout). Additional pad for stereo interconnect between two units. 100 William Street Ratio and Meter Switch Layout (21kB PDF File) Given the popularity of the Gyraf design, keeping it similar rather than creating an entirely new design seemed sensible. *However, I know that many builders have access to or have already obtained these rare devices. As always when building DIY equipment, the most difficult part is securing the components with which to build the thing in the first place. Pushbutton Switch Boards: Wes-Wagner BC107, BC560C, BD135, Level 6, Westfield Towers Revision A. PCBs & Parts. Secondly, many people had reported the gain of the stock G1176 was inadequate and far below what the original was capable of producing. None of the optional bypass or filtering caps were installed (though I have included all pads on my layout). For no other reason than aesthetics, I also wanted to use push buttons like the original. Ratio and Meter Switch Copper Layer (18kB PDF File) 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. OLA5 Opto Compressor DIYRE $300.00 Out of Stock EQP5 Passive Equalizer DIYRE $300 ... PR502 2-Slot Extender Kit DIY Recording Equipment From $150.00 see more > Microphones. Three styles of trim pots can be installed on the one board and in any combination. Pre-etched boards are available (see the Manufactured 1176 Clone Boards page for more board details on the latest revision). Read this. The levels were not changed at any point and the silence (or slight hiss) is the entire audio chain passing the signal up until the door. I also polled the Forum for additional features others wanted to see and incorporated some of these in the new board. That's $0.07. 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". It also uses an IC opamp for the meter driver stage rather than the bipolar transistors used in earlier versions. Because I had them lying around I decided to use a BD139/140 pair. It seems to have been worth the effort. Given the popularity of the Gyraf design, keeping it similar rather than creating an entirely new design seemed sensible. Futurlec BC107, NE5532 Ratio and Meter Switch Layout (21kB PDF File) 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. Mr. Rick Dowel If you would like to etch your own, Version F (Eurocard) files are available here: In the end I was satisfied with my OvErPriced transformer though as it apparently has a higher distortion rating than the Lundahl and sounds good and dirty - a positive characteristic for a distinctive compressor like the 1176. Dick Smith NONE There is very little, if any, wasted space and there are ZERO jumpers. Dick Smith NONE Nor do I believe that it is difficult to stuff the board with parts as others have suggested. I tend to take such claims with a grain of salt. All of our PCB's are manufactured to the highest quality standards. This is a recording I made in the Union Street Parking Garage in San Francisco a zillion years ago on my Panasonic SV-255 DAT recorder. NE5532, 7824 DIY WIKI? It has been inferred somewhere (the old forum?) Fax +61 - (0)2 - 9368 7199 Ratio and Meter Switch Layout (21kB PDF File) Revision H PDF files are here (note - these layouts do not conform exactly to Eurocard dimensions): Certainly there would be less difference between the BD517/518 pair and the BD135/136 than there would between this class AB amplifier and the completely different class A amplifier from the earlier UREI models. In the end I was satisfied with my OvErPriced transformer though as it apparently has a higher distortion rating than the Lundahl and sounds good and dirty - a positive characteristic for a distinctive compressor like the 1176. That's $0.07. Pushbutton Switch Boards: I tend to take such claims with a grain of salt. They are easily available and are the same transistors Lab Member IJR apparently used in his version of the 1176. Go Pro. Sure you need a little skill but if skill is a problem you should probably think about buying one pre-made anyway. (With a Perspective from Australia) The UREI 1176 is a classic audio compressor designed by Bill Putnam et al. These are suggestions culled from Microphone-parts.com A version for the originally specified BD517/518 pair with all the following modifications also exists. Revision H PDF files are here (note - these layouts do not conform exactly to Eurocard dimensions): Build your own 1176 compressor: Hairball Audio FET/Rack kits If you’re not afraid of picking up a soldering iron, you can also build your very own 1176 replica. The ratio options are 4:1, 8:1, 12:1, or 20:1. Mouser (USA) FDH333, BC107, BF245A, BC560, BD135, BD136 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. So I have created a version that incorporates all the other features listed but uses the BD517/518 pair. Certainly there would be less difference between the BD517/518 pair and the BD135/136 than there would between this class AB amplifier and the completely different class A amplifier from the earlier UREI models. The new board, dubbed Rev F after my own lettered revisions (having nothing at all to do with the various UREI schematic revisions), incorporates the following features: Version F Copper Layer (46kB PDF File) Take, for example, the FDH333 diodes. Ratio and Meter Switch Layout (21kB PDF File) Bill Putnam created the first 1176 compressor in 1967. ... Hey, there are so many kits on the internet. It has a characteristic quality that remains popular to this day. ugly kludge (scroll down the linked page to see a photo), literal loop where the ground trace ran all the way around the perimeter of the board, grouping the ground points in each circuit block and returning each group separately to a central star point, two additional boards using cheap pushbutton switches, Ratio and Meter Switch Layout (21kB PDF File), Ratio and Meter Switch Copper Layer (18kB PDF File). A 500 series kit based on the 1176 blue face compressor. This kit includes components for the 1176 module of our 4-channel frame system. Altronics BD135, BD136, NE5532, 7824 SWITCHABLE BLACKFACE AND BLUESTRIPE. Futurlec BC107, NE5532 One additional note: even though the screening can had been cited as essential in a post on Tech Talk, it isn't necessary at all. For nearly a decade Hairball Audio has partnered with talented PCB designer Mako Natsume. Revision H PDF files are here (note - these layouts do not conform exactly to Eurocard dimensions): But as it involved reversing the output transformer it required (again) an ugly kludge of cutting circuit board tracks with a Dremel tool and adding pieces of wire. Firstly, the output transistors specified are no longer in production and are therefore difficult to obtain*. Kalex BC107, NE5532, 7824 Depending on which schematic you refer to and which option you choose, the input stage is based either on Rev. Then I checked a source in the US: Users reported excessive hum which was traced to ground loops occurring within the PCB itself. It's also worth remembering that the original used different transistors altogether. Yet at Farnell's Australian site they cost a whopping $2.55 Australian Dollars each! ... SHOW ALL DIY COMPONENTS. that the BD517/518 output pair in the Gyraf version were chosen for their 'sound'. The LA-2A Leveling Amplifier is an audio compressor invented by James F. Lawrence II, founder of the Teletronix Engineering Company in Pasadena, California in the early 1960s. Due to coronavirus situation postal shipments are delayed. Ratio and Meter Switch Copper Layer (18kB PDF File) BD135/136 Version (substitute output transistors) 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. The new board, dubbed Rev F after my own lettered revisions (having nothing at all to do with the various UREI schematic revisions), incorporates the following features: They aren't interlocked like the original so you have to push one off before pushing another one. Ratio and Meter Switch Layout (21kB PDF File) 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. It has a characteristic quality that remains popular to this day. Version F Layout (96kB PDF File) The new board, dubbed Rev F after my own lettered revisions (having nothing at all to do with the various UREI schematic revisions), incorporates the following features: For no other reason than aesthetics, I also wanted to use push buttons like the original. Nor do I believe that it is difficult to stuff the board with parts as others have suggested. *However, I know that many builders have access to or have already obtained these rare devices. If you would like to etch your own, Version F (Eurocard) files are available here: Revision H Copper Layer Blue face FET compressor. More recently, a trace cut has been suggested and tried with good results. Pre-etched boards are available (see the Manufactured 1176 Clone Boards page for more board details on the latest revision). I started making a list of sources for transistors and other semiconductors in Australia: Mouser (USA) FDH333, BC107, BF245A, BC560, BD135, BD136 The partnership, based on a passion for quality design, has yielded some of the best DIY projects on the market today. Quality ribbon mics are a boon for many a studio situation and the Austin kits boast powder-coated brass bodies, hand-selected components, and a variety of transformer options, including Lundahl and Cinemag, to choose from. *However, I know that many builders have access to or have already obtained these rare devices. We are shipping orders within 3 working days, but we have no control over the packages after they ship. Three styles of trim pots can be installed on the one board and in any combination. Der 1176 ist vermutlich der bekannteste klassische, analoge Studio-Kompressor den es gibt. SEND N' BLEND. 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. We are an authorized dealer of these kits. There is no difference in the level of hum with or without the screening can. A special thanks to Gyraf Audio for making this design available. Additional pad for stereo interconnect between two units. Options for either OEP or Lundahl input AND output transformers. No site content can be published outside the www.rackneve.com without written permission from the content owner. This is a recording I made in the Union Street Parking Garage in San Francisco a zillion years ago on my Panasonic SV-255 DAT recorder. For no other reason than aesthetics, I also wanted to use push buttons like the original. A version for the originally specified BD517/518 pair with all the following modifications also exists. So I have created a version that incorporates all the other features listed but uses the BD517/518 pair. BD136, BF245 (no suffix listed but apparently 'A') While versions of the compressor are still commercially available, the adventurous will want to build their own. There doesn't seem to be an easy way around that one. That's about 25.5 times the price of the same part from Mouser at current exchange rates. OEP is installed natively (its ratio is 1+1:2+2 primary to secondary) for the same result. Version F1 Layout (97kB PDF File) RS Australia BC107, BF 245A, BD135, BD136, NE5532 Australia Though BC/BD devices are generally common in Australia the particular ones used in the 1176 clone aren't. Pushbutton Switch Boards: The UREI 1176 is a classic audio compressor designed by Bill Putnam et al. Altronics BD135, BD136, NE5532, 7824 It's also worth remembering that the original used different transistors altogether. card. These kits include only the highest quality USA made custom enclosure and transformers. They have the same pinout as the BD135/136 and so are interchangeable on my board. Version F Layout (96kB PDF File) There is very little, if any, wasted space and there are ZERO jumpers. It seems to have been worth the effort. The power supply caps do get a little squeezy but they still fit flush with the board. Mouser (USA) FDH333, BC107, BF245A, BC560, BD135, BD136 Mouser (USA) FDH333, BC107, BF245A, BC560, BD135, BD136 100 William Street Parts They have the same pinout as the BD135/136 and so are interchangeable on my board. Farnell Australia FDH333 The same item from RS Australia costs $39.10! Email: sales/AT/controldevices/DOT/net Revision H Checkplot 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. Revision H Copper Layer To hear my nearly finished clone with the modified board playing silence for 5 seconds, then a door closing, click here (151kB mp3 file). Ratio and Meter Switch Copper Layer (18kB PDF File) 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. Certainly there would be less difference between the BD517/518 pair and the BD135/136 than there would between this class AB amplifier and the completely different class A amplifier from the earlier UREI models. Additional pad for stereo interconnect between two units. It seems to have been worth the effort. There is no difference in the level of hum with or without the screening can. Version F1 Copper Layer (46kB PDF File) Though the layout isn't necessarily the most beautiful I've discovered it is truly a masterpiece in its own way. Each layout has a version where every component has a label or number. Below is a list of tools and supplies you’ll want to have on hand before embarking on your DIY experience. Futurlec BC107, NE5532 Kalex BC107, NE5532, 7824 We are working on alternative solutions. Wes-Wagner BC107, BC560C, BD135, I thought a more elegant solution to this band-aid approach would be to try grouping the ground points in each circuit block and returning each group separately to a central star point. The FET/RACK compressor series is no exception. *However, I know that many builders have access to or have already obtained these rare devices. Parts RS Australia BC107, BF 245A, BD135, BD136, NE5532 But as it involved reversing the output transformer it required (again) an ugly kludge of cutting circuit board tracks with a Dremel tool and adding pieces of wire. Farnell Australia FDH333 One additional note: even though the screening can had been cited as essential in a post on Tech Talk, it isn't necessary at all. BD517/518 Version (originally specified transistors) Dick Smith NONE RS Australia BC107, BF 245A, BD135, BD136, NE5532 There is no difference in the level of hum with or without the screening can. Revision H PDF files are here (note - these layouts do not conform exactly to Eurocard dimensions): I secured permission from Jakob to base a new design on his Rev 7 board and set about laying out the parts visually in Protel Autotrax using custom components I had created. 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. Semiconductors Partial Kits. U76a DIY raw kit. I have seen various sites on the internet showing how to build a clone of the UREI 1176 compressor, some better than others. However, I had a few problems with the Gyraf Revision 7 printed circuit board. They have the same pinout as the BD135/136 and so are interchangeable on my board. Revision H Copper Layer The original Gyraf Rev 7 board dimensions are 160mm x 100mm - a format apparently called a "Eurocard". The levels were not changed at any point and the silence (or slight hiss) is the entire audio chain passing the signal up until the door. There is very little, if any, audible hum. Sure you need a little skill but if skill is a problem you should probably think about buying one pre-made anyway. 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). MP573 Questions? 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. It has been inferred somewhere (the old forum?) This kit includes components for the 1176 module of our 4-channel frame system. Newark in the US sells them for $19.34 or around $26 AUD. 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. that the BD517/518 output pair in the Gyraf version were chosen for their 'sound'. OEP is installed natively (its ratio is 1+1:2+2 primary to secondary) for the same result. 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. 100 William Street When you add the screening can and courier shipping (of which you have no alternative) the transformer ends up costing nearly $80 AUD! A classic FET compressor. 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! That's about 25.5 times the price of the same part from Mouser at current exchange rates. Email: sales/AT/controldevices/DOT/net Options for either OEP or Lundahl input AND output transformers. Please don't forget to get the 4-channel Frame System Basic Kit if you're going to install this module into 1U enclosure. I started making a list of sources for transistors and other semiconductors in Australia: Revision H files now include rotary switch layouts. 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. So I have created a version that incorporates all the other features listed but uses the BD517/518 pair. that the BD517/518 output pair in the Gyraf version were chosen for their 'sound'. Nor do I believe that it is difficult to stuff the board with parts as others have suggested. This is a board that evidently is commonly found in pre-sensitised form in the European Union and elsewhere. While versions of the compressor are still commercially available, the adventurous will want to build their own. AU-Sydney NSW 2000 When you add the screening can and courier shipping (of which you have no alternative) the transformer ends up costing nearly $80 AUD! Kalex BC107, NE5532, 7824 Lundahl output transformer is installed 'reversed' to increase gain to the equivalent of the original UREI 1176. The resulting recording was then converted to the mp3 format with LAME. A version for the originally specified BD517/518 pair with all the following modifications also exists. Version F1 Copper Layer (46kB PDF File) These cost seven US cents from Mouser. None of the optional bypass or filtering caps were installed (though I have included all pads on my layout). They have the same pinout as the BD135/136 and so are interchangeable on my board. The same item from RS Australia costs $39.10! Ratio and Meter Switch Copper Layer (18kB PDF File) They are easily available and are the same transistors Lab Member IJR apparently used in his version of the 1176. Because I had them lying around I decided to use a BD139/140 pair. I started making a list of sources for transistors and other semiconductors in Australia: Secondly, many people had reported the gain of the stock G1176 was inadequate and far below what the original was capable of producing. 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. 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! Farnell Australia FDH333 1176 INSPIRED FET COMPRESSOR. Farnell Australia FDH333 Mouser (USA) FDH333, BC107, BF245A, BC560, BD135, BD136 While I had no such restrictions, usually cutting a board to size and coating it myself with photoresist, I thought I would try sticking to those dimensions anyway to see if it was possible to incorporate all the features into a size and shape many were familiar with.