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Old 22nd September 2008, 12:39 PM   #1
Ted205 is offline Ted205  United Kingdom
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Default 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:
Click the image to open in full size.

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

Am i being stupid ?
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Old 22nd September 2008, 01:34 PM   #2
Nuuk is offline Nuuk  United Kingdom
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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.
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Old 22nd September 2008, 02:19 PM   #3
CJ900RR is offline CJ900RR  Sweden
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I seccond that. Nuuks solution works like a charm
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Old 22nd September 2008, 03:28 PM   #4
Ted205 is offline Ted205  United Kingdom
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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: Click the image to open in full size.

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
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Old 22nd September 2008, 03:53 PM   #5
Nuuk is offline Nuuk  United Kingdom
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Ted, why the PSU?
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Old 22nd September 2008, 04:29 PM   #6
Ted205 is offline Ted205  United Kingdom
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turns out it was just the software settings 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)
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Old 22nd September 2008, 06:11 PM   #7
Nuuk is offline Nuuk  United Kingdom
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I still think that is is better to mute the audio out from the buffer until it has settled but good luck anyway.
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Old 22nd September 2008, 08:46 PM   #8
Ted205 is offline Ted205  United Kingdom
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its a work in progress, just trying to keep the signal path free :P.

Thanks for the circuit btw.
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Old 22nd September 2008, 11:07 PM   #9
Nuuk is offline Nuuk  United Kingdom
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But that is the point of the design shown on DD, ie it is not in the signal path.
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Old 23rd September 2008, 07:56 AM   #10
Ted205 is offline Ted205  United Kingdom
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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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