Relay Stepped Attenuator Schematic

A stepwise volume control is implemented with a set of tiny relays and resistors.

Relay stepped attenuator schematic.

It is very unusual to see a stepped attenuator with more than 64 steps. 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. It uses high quality miniature latching relays and precision discrete resistors to achieve a level of performance unattainable with conventional potentiometers or mechanical switch based rotary stepped attenuators. By avoiding any active.

Overview δ1 delta 1 is a high end stereo stepped attenuator implemented in a r 2r resistor laddertopology. In a high end audio system a noticable sound improvement over potentiomeneters is obtained also compared to audio grade potentiometers. 256 steps 0 5 db step size. Its ir remote control provides convenience over solutions with stepped attenuator rotary switches.

The differential amplifier removes common mode interference while maximizing the use of the voltage headroom in the 256 step attenuator. The differential amplifier delivers a voltage balanced signal to the attenuator stage. 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.