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Relay
switching for audio

up vote2down votefavorite

I'm designing an audio equalizer with the option to relay switch
between a solid state and transformer output path. I'm worried that the
relay will cause an audible pop on the output as the relay switches. My
thought is to use an additional relay that creates a resistive path to
ground a moment before the output relay switches and remains active until
the output switch becomes stable. I'm thinking for half second before and
half second after. This needs to be accomplished with the Output Select
DPDT switch. When the switch is activated the resistive shunt relay would
need to activate half a second before the output relay switches and
release half a second later. This process will occur each time the switch
is pushed in or out. I will have 24 volts to activate the relays and the
circuit. Does anyone have ideas

relay

share|improve
this question

edited
Mar 10 '14
at 6:03

asked Mar 9 '14 at 23:31

user38467

113

2

Why
not an analog mux/demux? – Ignacio
Vazquez-Abrams Mar 9 '14 at
23:53

@user38467
If you post a schematic or a block diagram of your proposed design,
it will be easier to understand your question.
– Nick
Alexeev♦
Mar 9 '14 at 23:56

add a comment |

2 Answers 2

active oldest
votes

up vote2down vote

Anything that switches rapidly can cause a pop. Here's an example of a
switch that is "popless" because it gradually changes the attenuation
(courtesy of Vampire Squid Labs).

Some audio mux chips have a zero cross switching function built in
which performs a similar function.

share|improve
this answer

answered Mar 10 '14 at 0:18

Spehro
Pefhany

95.4k245159

So
you would use one of these circuits for every input that needs to be
switched, and tie them together at the node marked "To Amplifier"
? – tcrosley
Mar 10 '14 at 19:05

add a comment |

up vote1down vote

A relay in an audio path is going to cause a "pop" under two
conditions:

If there's a voltage across it at the moment it closes.

If there's a current flowing through it at the moment it
opens.

There's no way around this; if you can't avoid these conditions, then a
relay may not be the correct solution for your application.

share|improve
this answer

edited
Mar 10 '14
at 2:04

answered Mar 10 '14 at 1:45

Dave
Tweed♦

67k772138

add a comment |

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