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Old 25th June 2006, 09:22 AM   #1
derekyu is offline derekyu  Hong Kong
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Default Preamp output delay

I am looking for a preamp output delay. (kit or scheme is ok)
can anyone assist me?
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Old 26th June 2006, 01:16 AM   #2
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look/search for SY's Heretical Linestage here, he used a fet and a relay for output delay. Frank's Ultimate used the simpliest of all - a mute switch.
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Old 26th June 2006, 01:28 AM   #3
Sherman is offline Sherman  United States
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I just put together a "passive pre" using a pair of circuit boards from diyclub.biz which has a delay circuit built-in. You could use this as the front-end for an active preamp since it supplies volume control and source selection.

I don't remember the exact model number but it is the set that sells for $32 US. You can switch four sources control volume and mute via remote.

When you switch sources the system mutes and then turns the volume control all the way down. It then switches in the newly select source and raises the volume control slightly so it is audible. The delay is also there when powering up the circuit.

It uses LEDs (that you supply) to indicate which source is selected. When the delay from switching sources is active the LED blinks rapidly.

All in all a pretty nice set of boards for a great price.
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Old 26th June 2006, 06:30 PM   #4
yagas is offline yagas  Greece
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Also take a look:

http://www.borbelyaudio.com/eb600312.asp

Suitable relay for delay cicuit
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Old 28th June 2006, 05:49 PM   #5
derekyu is offline derekyu  Hong Kong
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thanks you for all yours helping hands
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