All of the parts should be available from Mouser. All of the original components needed for the printed circuit boards are currently available. As indicated on the original schematic, some details regarding the transistors should be noted. I fed a sine wave into the input until I had a +4dBm output at 1kHz. 180k Personally, I like the vintage look of Ed's model and I would guess that the lower price compared to the Cinemag will be attractive for a lot of builders especially considering that there are no performance compromises. Your initial setting should allow the maximum signal to pass through before you perform the calibration. Listings Price Guide. Your initial setting should allow the maximum signal to pass through before you perform the calibration. Notice there is a little ringing. Either set should ensure reasonable performance. Sign me up. On the other hand, you may think it sounds better without one. Currently, the EA-5002 is available from Hairball Audio. I'd probably be looking in the $600-$700 BOM cost per channel. The Cinemag was -3dB at 58.1kHz while the EA-5002 was -3dB at 60.2kHz. Output transformer designations are for the Cinemag replacement transformer. I also did a sweep to find the -3dB upper limit of the two transformers. This is a time-lapse video of the Hairball Audio FET compressor build. The Rev F or later circuits do not require this calibration at all. Back in the day when the 1176 was designed most equipment had a 600 ohm input impedance - much like the input of the 1176 itself. Si resides en un país miembro de la Unión Europea aparte del Reino Unido, los impuestos de importación de esta compra no se pueden recuperar. Personally, I like the vintage look of Ed's model and I would guess that the lower price compared to the Cinemag will be attractive for a lot of builders especially considering that there are no performance compromises. It is worth keeping in mind that resistor tolerances in the original unit were 5% while a tolerance of 1% is typical today even with off-the-shelf parts. These original "trailing edge" bipolar transistors have a different pin assignment than newer devices. your own Pins on Pinterest This will ensure the greatest accuracy when using common values. Please note that there is an error in the video. The Cinemag is connected internally, so it has only two wires at the output. A trimmer potentiometer has been used in place of the selected, fixed resistor (R44) in the original. Matching Q1 and Q11 may ensure accurate tracking of the gain reduction metering circuit that reflect the actual behavior of the audio gain reduction. Revision D Version 2.2 25.02.13 (currently being supplied): Current Revision D Version 2.2 Overlay, Schematic and BOM, Older Revision D Version 2 PDF File with self-etch files, Original Revision D PDF File (includes self-etch files and bill of materials), Some comments have been posted about the choice of input transformer, CJ has posted some scans that show the transformer specs, the last comments in this post from W O'B. ORBAN 412A COMPRESSOR/LIMITER - BLUE FACE NEW OLD STOCK IN BOX WITH MANUAL. Please note that there is an error in the video. Stereo 1176 Rev D: Part 1 Around the time I’d last posted about compressors, I mentioned my next project which was going to be a stereo 1176 Revision D. It’s been a while since then and I’ve made a lot of progress, but I have hit a snag. 39k The first image shows the Cinemag CM-96731 with a 1kHz square wave terminated to a 10k load - fairly typical of modern line input impedances. from rev. en los que posee un envase). El envase debe ser igual al que se puede encontrar en una tienda, a menos que sea un artículo hecho a mano o que haya sido empaquetado por el fabricante con material no comercial, como una caja o una bolsa de plástico sin logotipo. Para obtener información adicional, consulta los. Mnat’s Rev D PCB allows DIYers to build a replica of the 1176LN revisions C, D, and E. The PCB is named after revision D because it replicates the low-noise circuitry first found in that revision. I would suggest that you test each component before stuffing it in the board. This video describes the "Q" Bias Adjustment. The inline pads are for the 2N3707/8 devices. You may wish to select FETs for a particular threshold range. For the Version 2 PCBs currently being supplied, there are additional footprints for Q5, Q12, and Q13 so 2N5088s can be used in these positions too. Jul 10, 2015 - This Pin was discovered by Dylan Emelianoff. Urei. Some differences between the original Revision D and the mnats Revision D are: Professionally fabricated boards have the component designations and values printed on the board. Alternate dielectric choices are left up to the builder, and additional footprints are provided in locations where parts are typically substituted - in the audio path. Similarly, "European" BC devices have different pinouts as well. If these exact values are unavailable to the builder, some suggested replacements using typical values are suggested below. I know 1176's are noisy but the trade off for a so-so and specific tone isn't worth it. R12 Value should be 1.8k rather than 920 Compartir en Facebook (se abre en una nueva ventana o pestaña), Compartir en Twitter (se abre en una nueva ventana o pestaña), Compartir en Pinterest (se abre en una nueva ventana o pestaña), Estados Unidos y muchos otros países We have here a very rare 1973 1176 Revision E. As you may know, the most famous revision is the revision D, often imitated. It uses a three-terminal regulator for the +30V 50mA rail rather than a hard-to-get power zener. Year 1176 was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar. It must be performed after the "Q" Bias Adjust described in the video above, otherwise the adjustment is meaningless. 7.5k Sequentially, this adjustment comes before any of the other calibration steps of the gain reduction meter circuit. Check out the last comments in this post from W O'B. Compressors and Limiters. $375.00 + shipping. Note that on the Rev A you put your meter on the null test points between the two collectors. Alternate dielectric choices are left up to the builder, and additional footprints are provided in locations where parts are typically substituted - in the audio path. One subtle difference is that the GR (Gain Reduction) meter setting doesn't ground one terminal of the VU meter in the discrete version as it does in the IC circuit and special rotary control PCBs have been designed with this in mind. The revision E is just the same as revision D but with a 240 volt switch for More from our DIY builders. This step applies only to the DIY Revision A and D boards with the discrete transistor meter circuit, not to the G1176 or similar Revision F or later boards with the IC in the meter circuit. Click on any of the images for a larger version. Known forks (0) We didn't find the known forks. Adaption includes changing to standard european transistors, component values, Lundall output transformer and rotary switches for easier enclosure layout. It has a 600-ohm input transformer made by Peerless that was later replaced with a UTC unit. In great shape, fully functional. It is clear from the schematics that the designers saw it fit to select components in the early versions and to make use of precision resistors in this part of the circuit when they became available. I know the 4-710 has limited versions of the 1176, but it's less than that per channel, with the pres! Revision D Version 2 10.03.08 errata: Beats the plugins for sure. Contributors. It is clear from the schematics that the designers saw it fit to select components in the early versions and to make use of precision resistors in this part of the circuit when they became available. So either transformer will make a fine match for the circuit. The next image is the same 1kHz square wave terminated into a 10k load but using the EA-5002. |, Se proporcionará al completar la transacción, Este monto incluye aranceles, impuestos, corretaje y otras tarifas aplicables. I fed a sine wave into the input until I had a +4dBm output at 1kHz. Imprecision in this circuit might result in different levels of gain reduction if the same asymmetrical signal is inverted in polarity. Ed Anderson kindly sent a sample of his version of the special output transformer that I'll call the EA-5002. These values ensure that both the positive and negative swing of the input signal is treated identically. Love the Rev D I just built. Open in Editor. There is no resistor at this location on the Rev A as there is on the Rev D. The next step applies to all versions of the 1176 limiter. The boards are 3.7" x 6.7" (94mm x 170.2mm) so two of them will easily fit in the average 2U rack case. Please refer to the manual linked in the paragraph above for a full explanation of the calibration procedure. Purple Audio also had a reproduction of the UTC made which is now available from Hairball Audio. Some of the UA reissues don't use the same input configuration, but rather something more like the G1176 project uses in the transformer input option. Contact Us. “Rev C” introduced new low noise circuitry, as well as a new feedback circuit to minimize distortion. Stay updated & informed Receive product updates and DIY Tips. Next is Step 2: Calibrating the Discrete Meter Circuit. 1176 Rev D; 1176 Rev D. This is a build supplied by the good folks at Hairball Audio. Refer to the original schematics in the 1176 manual linked in the sidebar if you have any questions. Set 1: (FET Compressor Rev A/D Bundle with Enclosure $360 direct, www.hairballaudio.com; 1176 Rev A or D boards set $26, www.mnats.com; remaining parts approx $35, www.mouser.com or www.digikey.com) Tape Op is a bi-monthly magazine devoted to the art of record making. Summer – Emperor Manuel I (Komnenos) assembles a Byzantine expeditionary force and marches towards Iconium the Seljuk capital. Use the alternate base pad between the collector and emitter pads that form a triangle. Refer to the manufacturer's pinout if you are unsure. All external wiring points on the main board terminate at the edges of the board and are placed on 0.2" centers. Select Q12 and Q13, matching hFE within 10% (the absolute value is not critical). Q7 through Q10 must be selected for an hFE of 250 or above. The Comp76 plugin by Overloud offers three versions of their 1176 recreation: Rev A, Rev D, and Rev F. By emulating these three units, each with their own distinct tones, you can create an “original” warm sound (Rev A), the classic “low-noise” model (Rev D), or a tight, modern sound (Rev F). Though the procedure is essentially the same for all revisions of the 1176, this video is specific to the Rev C/D/E in that it names the trim pot by those revision's designation for the pot (R59). He offered these transformers in July 2008 at the Prodigy-Pro Black Market. The 1176 was meant to be a "true peak limiter" with a very fast attack of up to 20 microseconds, and lots of gain for a compressor: up to 45 dB! Colors are marked on the board and on the PDF overlay screen layer page. The next image is the same 1kHz square wave terminated into a 10k load but using the EA-5002. After relaunching the brand in 2000, the design team at Universal Audio took cues from the Blackface 1176 LN, including the C, D and E revisions of the famous compressor. Revision D Version 2.2 26.01.09: 7.3k When it comes to modern versions of the 1176, the first place to start is with the Universal Audio 1176 LN. These original "trailing edge" bipolar transistors have a different pin assignment than newer devices. Use the alternate base pad between the collector and emitter pads that form a triangle. The magnitude of a given signal is accurately converted into an exact DC control voltage regardless of the polarity. At 1:54 the video says to turn the trimmer so the wiper is closest to ground. Sequentially, this adjustment comes before any of the other calibration steps of the gain reduction meter circuit. Even if your eyes are very good and you know the resistor codes backwards and forwards you can usually count on a bad component if you don't check before inserting it into the board. The negative supply is unchanged. The output transformer is available direct from Cinemag. Notice that the ringing is completely gone now. Note that on the Rev A you put your meter on the null test points between the two collectors. You hardly ever see these earlier revisions come up for sale. While the 1176 has seen a huge number of revisions in its history, the most significant revision to the 1176 circuit was designed by UREI engineer Brad Plunkett in an effort to reduce noise — hence the birth of the 1176LN (LN stands for low noise) at revision C. Numerous design changes followed, resulting in at least 13 revisions and variations on the 1176. This makes them ideal for screw terminal blocks, simplifying wiring and allowing alterations to be made without de-soldering and potentially pulling up printed circuit board traces. The mnats revision D printed circuit board for the 1176 DIY project will allow you to build a near-exact replica of the 1176LN Revision C/D/E compressor with the correct external components, but also allows room for experimentation in the output and, particularly, the input circuit. All of the original components needed for the printed circuit boards are currently available. 4 août 2015 - Cette épingle a été découverte par Sándor Juhász. The Cinemag is connected internally, so it has only two wires at the output. Alternatively, you can refer to a post by Studio Electronics' guru David Kulka: here for Rev D calibration in a nutshell. Please note that the video below describes the second step of the calibration process. With the Version 2 boards a footprint is provided to either wire a link or solder in a three pin header to put the Tracking Adjust trimmer in or out of circuit. This is an adaption of the original UREI 1176 LN rev#F to components and parts that is available (hopefully) everywhere. I fed a sine wave into the input until I had a +4dBm output at 1kHz. Copyright © 1995-2021 eBay Inc. Todos los derechos reservados. The trimmer is normally out of circuit on the Version 2 boards so you will have to link the rounded rectangular pads together once the initial Null Adjust trimming is done, otherwise your gain reduction meter circuit will not operate correctly. The next picture above shows the Cinemag terminated into a 619 ohm resistor.
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