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 23rd November 2002, 04:11 PM #1 Dj BASS AMP Account Disabled   Join Date: Jul 2002 fuse i have a DJ amp 800W X1 (4 Ohm) (8 tr' of 2SC5198-2Sa1941) in my amp dont have a fuse or protection... i want to put a fuse for protection.... how much (A) fuse i needed for speaker out?? and how much (A) fuse i needed for power supply in my amp?? (48V AC 600VA)
 23rd November 2002, 04:21 PM #2 trwh   diyAudio Member     Join Date: Apr 2002 Location: UK Hi DJ To calculate the correct speaker fuse value, we can use the equation P = I^2*R, which is rearranged to I = sqrt(P/R). Thus, a 800W 4 ohm speaker should draw an RMS current of about 14.1A. A 15-18A speaker line fuse would therefore be suitable. For a symmetrical 48V supply with a 600VA transformer, ignoring any rectifier losses, a maximum current of about 6.25A per rail can be supplied. A 6.3A slow blow fuse in each rail would be about right - maybe a 10A if you experience any nuisance blowing. Make sure you place the fuse in the supply line _after_ the reservoir capacitors. As a side note, the fact that your "800W" amp only has a 600VA transformer and absolutely no output protection, shows it is a poor design. Like I say, consider proper PA equipment next time. Hope I've answered your query, Tim.
 23rd November 2002, 04:29 PM #3 Dj BASS AMP Account Disabled   Join Date: Jul 2002 can i make him stronger....? change the transformer to 50V AC 800VA change the tr' (2SC5198-2SA1941) to 2SC5200-2SA1943 ?? (i build this amp...)
 23rd November 2002, 04:33 PM #4 trwh   diyAudio Member     Join Date: Apr 2002 Location: UK "can i make him stronger....?" Not easily. The whole design must be considered, you cannot just increase the capacity of the transformer and change the output transistors. If you need more power I wouldn't waste time and money on this amp - try a different design. Tim.
 23rd November 2002, 04:44 PM #5 Dj BASS AMP Account Disabled   Join Date: Jul 2002 i have a lot of strongs Dj Amplifiers... of GEMINI and PYRAMID (bad amp) and NUMARK AMPS... for my dj... but i want to build a amp... soo can i shange the part in my amp to make him stronger? the money is not a problem...
 23rd November 2002, 04:47 PM #6 jleaman   Banned   Join Date: Apr 2002 dj bass amp if you want raw nice out put power and you want tobuild it i would go witha pair of av800's from www.aussieamplifiers.com i ordered my boards and wow they look nice. it might cost ya a few pennies but hey youll have TONS of crisp clean and reliable power. like me..: O )
 23rd November 2002, 04:51 PM #7 dhaen   diyAudio Moderator Emeritus     Join Date: Jun 2002 Location: U.K. Generally "silicon fuses" blow faster than real fuses. When the real fuses blow, it's often too late. BTW: I'm not saying don't use them - just an observation!
 23rd November 2002, 04:53 PM #8 trwh   diyAudio Member     Join Date: Apr 2002 Location: UK "soo can i shange the part in my amp to make him stronger?" No. Not just the transformers and transistors. "but i want to build a amp..." The "double barrelled" Leach amp would be a good choice, or maybe one of the designs from www.aussieamplifiers.com. Tim.
 23rd November 2002, 04:54 PM #9 trwh   diyAudio Member     Join Date: Apr 2002 Location: UK Oops, sorry Jason, I was writing my post while you suggested www.aussieamplifiers.com!

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