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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Over sensitive Expensive fuses ??? posted by ABliss on June 10, 2007 at 08:57:36:
How 'stiff' a power supply are you operating, i.e. how many uF per rail ? You must remember that a capacitor acts as a dead short until it has reached 2/3 of its'full charge. One solution would be to add a 'soft start' circuit consisting of a 120v dpdt delay relay and a pair of 40-50 ohm R's. Wire the relay so that upon start up of the equipment the R is between the tfmr. secondary and the power supply in each channel. Set the delay of the relay for about 5 seconds with the second poles of the relay bypassing the R in each channel. At start up the R will pad the circuit limiting the current flow to the power supply. After the 5 second delay the relay cycles and bypasses the padding R's. It would also be a good idea to install a 250v 0.01 uF ceramic cap accross the contacts in the relay (4 required) to prevent arcing between contactcs as the relay cycles, greatly prolonging the life of the relay. These relays are available on the surplus market for under $10.
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Follow Ups
- RE: Over sensitive Expensive fuses ??? - pkell44 18:35:36 06/15/07 (0)
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