The SL 4000 from SSL could be considered the quintessential analog mixing console. Please note: if you encounter a problem, please do not post on the monome forumsTehn will surely help you, but I don’t want my clone to cause them trouble and work.The Ultimate SSL Bus Compressor Plugin Roundup. An open source, protocol-compatible clone of the monome arc. This model compressor does 'glue' and 'tranparent' with ease.Link for differing resistor values if you use alternate VCA chipsMonome Arc Clone Github. The original compressor that this is a clone of has probably been used on more hit records than any other compressor over the past 30 years. The Radioman Stereo Buss Compressor is a state of the art 1U rack mount clone of the G-Series consoles from the Oxford-based company.
Ssl Compressor Clone Free From TubesBut the SSL4000 desk is priced as to be out of reach for most small studio owners. But it has a nice moving coil meter at least.My reason for doing this clone is that the SSL is one of the worlds widely recognized stereo mix compressors – it has a well known sound, and is lusted after by many recording engenieers. And sorry, this design is absolutely free from tubes and transformers. Time constant selector.This is a design I did way back in my early years, so you’ll have to bear with the ugly pcb layouts. Threshold control (Variable, 0 to 30 dB).Ssl Compressor Clone Series Of ChangesThe main changes concerns the electronically balanced input and output and the removal of unneded components regarding the autofade and main fader circuits. The SSL mixbus compressor is an integral part of the mixer’s main quad fader and autofade system – cards 82E26 and 82E27, and as you can see if you compare these to my schematic, a series of changes have been made for rehousing the circuit. The beauty of this design is that – contrary to a lot of other esoteric projects – the components are (relatively) easy available anywhere, and no special knowledge, tools or adjustments are needed.The compressor is cloned from our good old SSL4044E desk, dating back from ’85. Music from schindler39s listAlways take care when handling mains voltages!!. There’s space for a on-board power transformer, but depending on the quality and size of this, you might want to mount a transformer – preferably a toroid type (2x15V, say 10VA or more) – off the pcb. One is the mainboard, carrying most of the electronic and the power supply. This might seem like a big change, but actually the sonics are preserved very close to the original, and tracking errors are cancelled.The PCB are in two parts. We did things like that to the SSL in the old days. No cooling should be needed for the regulators. Also take care that the housings of the 7815/7915 voltage regulators dont touch each other, one carries 0V, the other -15V. VCA) is oriented reversed compared to the others, and two NE5534’s are also mounted differently. For the THAT VCA’s (that are single-in-line types) just cut a 16-pin socket in halves.Observe that one of the three VCA’s (the SC. When mounting components onto the PCB, use IC sockets – the “turned pin” types are the best. The signal carrying 22u and 100u electrolytics are high quality, low ESR types, the PSU decoupling are standards. If you run completely out of room, you could always mount come of the smaller capacitors from the underside of the PCBThe 100nF bypass caps are standard 5mm polyester types – marked “.1″ on the component overlay – and 100pF and downward are all ceramics. Sorry about this, but – as said – this is a very early layout, and “if it works – dont fix it”. Around the output stage the PCB gets a little overcrowded, so be stratetic in the order you mount the components. In case you choose a IEC power inlet connector with a power ground, you should connect it to this point also.For the power switch I prefer a rotary type, but any type heavy enough to safely carry mains voltages will do.The second PCB is 30x160mm (one third of a 100×160 piece), connects to the mainboard via a 10 pole cable, and carries the controls – the switches for ratio, attack and release. For connections between the boards, and to and from the in/outputs, you can use pcb connectors like I did, or just solder the wires directly onto the PCB (there’s not much space to do so – you may want to solder the wires onto the underside of the PCB).The chassis should be connected to 0V at – and only at – the ground (pin1) of one of the input XLR’s. The easiest way is to use an IEC power inlet with integral fuseholder. The easiest way to handle PDF-files on Internet is to right-click on the link and select “save target as”. If in doubt, use the text on the board as reference. Please note that the PCB (copper) side is drawn MIRROR’ED – enabling closer printout-to-photoresist contact when making the PCB.
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