Relay Stepped Attenuator Schematic

In a high end audio system a noticable sound improvement over potentiomeneters is obtained also compared to audio grade potentiometers.

Relay stepped attenuator schematic. Relay attenuator shield has been designed for audio attenuation after piano dac output by 1db step size its compact and simple circuit just 6 tiny relays implement a 64 step logarithmic stereo attenuation the 64 steps of 1 0db together span a 63db audio attenuation range. The differential amplifier removes common mode interference while maximizing the use of the voltage headroom in the 256 step attenuator. Overview δ1 delta 1 is a high end stereo stepped attenuator implemented in a r 2r resistor laddertopology. However relay attenuators do have a couple of advantages among which that they can be built for a reasonable cost.

A stepped attenuator also has very good channel matching but whereas even the expensive dact only gets you 24 steps typically with 2db between them 128 or even 256 steps of 0 5db each are quite easily achieved with relays. A stepwise volume control is implemented with a set of tiny relays and resistors. Its ir remote control provides convenience over solutions with stepped attenuator rotary switches. Attenuator that provides good performance yet can be built with a few basic tools 1 this unit is designed for use in 50 ω line provides a total attenuation of 71 db in 1 db steps offers respectable accuracy and insertion loss through 225 mhz.

δ1 v1 0 boards are now available at amb audio shop. The differential amplifier delivers a voltage balanced signal to the attenuator stage. It is very unusual to see a stepped attenuator with more than 64 steps.