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on/off thump - use Time Delay Relay ?
on/off thump - use Time Delay Relay ?
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Old 29th June 2008, 03:01 AM   #1
redrabbit is offline redrabbit  Isle of Man
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Default on/off thump - use Time Delay Relay ?

I've built several Cmos circuit type relay "thump" protectors, and they work well in my audio preamps.

But I came across a box of older/unused time delay relays.
They use a tension ribbon and heater method to activate in about 4 seconds....NC (normally closed) contacts.
They de-activate immediately when their coil power is cut.....which is exactly what the other Cmos circuits do.

Is there any reason I should not consider using such a relay for "thump" protection ?


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