Other Cabling OptionsĬables can have one lead, two leads, two leads with shield, four leads (with or without shield) and many other variations. Depending on the cable, it can also be white. It will be the shield on your shielded audio cable. The RED cable is always the RIGHT CHANNEL. Here's a picture of a two-lead shielded audio cable: Both to keep the cabling capacitance down and to avoid unnecessary interference. You will want the input signal cable to be as short as possible. NOTE: Make sure that the input is closest to the back panel. They were connected to the back panel in the previous step, and this is where they attach to the phono stage itself. The left side of the board is the input (from your turntable), the right side is the output (to your amplifier). #Reamp box schematic how toThe picture below shows how to hook up the phono stage, using two-lead shielded audio cable: The two audio cables, input and output, that connect to the back panel must also be connected to the phono stage. Connect another cable to the output, which is the two remaining RCA connectors, and the back panel is done. Here's how the input cable is connected to the RCAs. The best choice will be to use a shielded phono cable, especially for the input. These are the cables that connects the phono stage. Connect them all together as shown in this picture: The first thing we'll do is to make sure all the grounds are the same for every RCA connector and the ground screw. Two female RCA panel connectors for output.Two female RCA panel connectors for input. We're not completely finished yet, we need to input the sound from the turntable and output the amplified and equalized signal. We have even learned a lot of stuff along the way, and should be able to change the circuit to suit our needs. Soon you'll be spinning records like never before. This concludes the build of the Muffsy Phono Preamp. Even more interesting information in the hackaday.io Project Log.Detailed documentation and build instructions at Instructables.Terminal blocks can be used on the input/output/power connections.The board uses only standard component values.Easy connection of two-lead shielded audio cable.It's got a high quality companion power supply. #Reamp box schematic fullThe PCB is dual layer with a full ground plane.The PCB is 40% smaller than the original size.The Muffsy Phono Preamp PP-2 has improved upon this circuit: Passive RIAA equalization between the two gain stages.In its original form, it has the following features: This project would not exist without all the work that has been done by the guys that hang out at AudioKarma. The AudioKarma CNC Phono Stage started its life on the AudioKarma forums, ignited by user Fasterdamnit: Input Impedance: 17k-150k ohm in fifteen steps.SNR: 112.83 dB (Shorted inputs, relative to 1 Vrms/0 dBV).
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