Check the listing for details. Calrec DL3678-2 Compressor DIY Racking PCB. Listed at 25.00 USD. There are a ton of these compressors floating around right now. After grabbing some myself, I created some PCBs to both power the compressors and break them out to XLR. This PCB provides you with a very simple solution that allows you to use the card's own ribbon cable connector so all you have to do is assemble the PCB and plug the compressor card in. If you have a set of these cards, I also offer a four-card version that uses DB25 connectors for inputs and outputs. In terms of a DIY build, this is pretty easy. Harder than wiring a DI box, but easier than building most high-end audio processor clones. If you're good with a soldering iron, know how to use a multimeter to adjust a trimpot to a specified voltage, and have wired a toroidal transformer or bipolar power supply, you will not struggle with this. The toughest part of soldering this PCB is the ribbon cable connector (you'll want a fine tip for that), but all of this is through-hole soldering. No SMDs anywhere. I have parts lists and will provide support, however you may need to look for drop in equivalents- I've found that components I specify will be sold out a week later. As a result, it's essentially impossible to give you an exact mouser cart that will have everything in stock. The crucial, harder-to-find components (DB25s, ribbon cables and connectors) are fortunately not typically out of stock. This is for the PCB only. It is an original creation of my own- it's not an official Calrec product. I've build out both this and the four-card version and the designs are confirmed working. KEEP IN MIND that the compressor cards floating around on ebay are in varying levels of functionality- some work well, but others have problems. These PCBs don't process or pass audio other than directing the audio out of the card to standard XLR or DB25 connectors. If, for example, you have some signal loss in one channel, but not the other, that's almost certainly an issue with the card. Swapping with another card (if you have one) will confirm this. There are no refunds for these, but I'm offering free domestic shipping. If you buy more than one PCB, I'll combine shipping. Let me know if you have any questions.