Relay Stepped Attenuator Schematic

It is very unusual to see a stepped attenuator with more than 64 steps.

Relay stepped attenuator schematic.

Overview δ1 delta 1 is a high end stereo stepped attenuator implemented in a r 2r resistor laddertopology. δ1 v1 0 boards are now available at amb audio shop. Its ir remote control provides convenience over solutions with stepped attenuator rotary switches. A stepwise volume control is implemented with a set of tiny relays and resistors.

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. 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. 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. 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.

By avoiding any active. 256 steps 0 5 db step size. The differential amplifier delivers a voltage balanced signal to the attenuator stage.