Relay Stepped Attenuator Schematic

The differential amplifier delivers a voltage balanced signal to the attenuator stage.

Relay stepped attenuator schematic.

A stepwise volume control is implemented with a set of tiny relays and resistors. By avoiding any active. Its ir remote control provides convenience over solutions with stepped attenuator rotary switches. 256 steps 0 5 db step size.

In a high end audio system a noticable sound improvement over potentiomeneters is obtained also compared to audio grade potentiometers. Overview δ1 delta 1 is a high end stereo stepped attenuator implemented in a r 2r resistor laddertopology. 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. 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.

However relay attenuators do have a couple of advantages among which that they can be built for a reasonable cost. The differential amplifier removes common mode interference while maximizing the use of the voltage headroom in the 256 step attenuator. It is very unusual to see a stepped attenuator with more than 64 steps.