Shared Projects by rsdio

Phono head amplifier with flat frequency response, designed for digitization of vinyl where RIAA equalization will be performed in the digital domain.

CV fixed gain, variable offset

This started out as an educational schematic to show how to take a Control Voltage that ranges from 2.2V to 10V, and expand it to cover 0V to 10V. The differential amplifier gain is set by R2/R1 and R4/R3, where the resistors should match. The trim resistor allows 0V to be dialed in.

Passive phono to ¼" stereo and ¼" TRS

I needed a way to ground my turntable when connecting directly to a high-end, balanced digital audio computer interface, but I did not want to design an expensive metal case. So, I found the Pyle PP444 product for $15 and designed this PCB to fit the existing holes and mounting screws.

You can convert the dual RCA phono inputs to both a stereo ¼" headphone jack and a pair of balanced ¼" TRS jacks for stereo audio. There are various grounding options available by installing jumpers.

The power input and LED are not actually used, but you could hook them up if you like.