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Old 28th December 2012, 04:09 AM   #1
Zoodle is offline Zoodle  Australia
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Join Date: Jun 2009
Default 'Soft-on' a good idea?

Hi DIYers,

I finally built something (making use of advice received here, thanks

I thus have a -/+15 power supply (LM317/337) fed by a dual 15v (nominal) AC toroidal (50VA total). This supplies a small device that has five dual op-amps (it's an electronic crossover).

At the moment, there is no switch, I just plug the power cord into the wall.

I'm slightly concerned that the crossover and/or the power supply circuit might be receiving a 'rude awakening' when I plug the power cord into the wall.

I will be making one for someone else, and want to do a good job in every way, and that brings me to the following situation:

The device needs to last well in regular use. When not in use, the transformer's primary must be isolated from the mains (not negotiable).

So, IYO, should I provide some kind of time delay relay, which connects power to the crossover after a couple of seconds? Or is it better to place it after the transformer (IE before the PSU circuit)?

What are the issues (if any) when connecting/disconnecting a dual rail supply? Do you make/break the ground instead (or is that a bad idea)?

Will be grateful for the benefits of your experience.
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