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Ted205 22nd September 2008 11:39 AM

Relay delay
Sorry for the newbie question.

Looking to implement a delay to the preamp output to avoid pops on start up.

I'm trying to use a simple 555 timer. I've simulated this:

theory says this should work. But in the simulation doesn't.

Am i being stupid ?

Nuuk 22nd September 2008 12:34 PM

Not sure about your circuit Ted but this one on Decibel Dungeon works fine, and you can vary the delay to suit different pre amps/buffers. ;)

CJ900RR 22nd September 2008 01:19 PM

I seccond that. Nuuks solution works like a charm :smash:

Ted205 22nd September 2008 02:28 PM

so the version on dd starts high and goes low after x seconds?

as this is how i have it working on bread board :)

the schematic of the circuit in multisim:

but it does work as it does in the real world. or am i being stupid?

i want to integrate it into my psu pcb so would like to be able to sumulate and route it :)

Nuuk 22nd September 2008 02:53 PM

Ted, why the PSU? :confused:

Ted205 22nd September 2008 03:29 PM

turns out it was just the software settings :xeye: working ok now (set initial conditions to zero)

i want to use it in the psu to switch the power amp V+ and V- on after a short period (i.e after power has been applied to the buffer and allowed it to settle)

Nuuk 22nd September 2008 05:11 PM

I still think that is is better to mute the audio out from the buffer until it has settled but good luck anyway. ;)

Ted205 22nd September 2008 07:46 PM

its a work in progress, just trying to keep the signal path free :P.

Thanks for the circuit btw.

Nuuk 22nd September 2008 10:07 PM

But that is the point of the design shown on DD, ie it is not in the signal path. ;)

Ted205 23rd September 2008 06:56 AM

i read it that the relay shorts the buffer output to ground for a short period while the power is applied to it. I was planning to switch the power amp section on after the buffer has settled.

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