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Old 4th July 2007, 04:32 PM   #1
scaesic is offline scaesic  United Kingdom
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Default fuses for tda2050

what current rating fuse should be used before the power section powering a tda2050?
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Old 5th July 2007, 09:13 AM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
what supply voltage are you planning?
What speaker impedance do you intend using?
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Old 5th July 2007, 02:44 PM   #3
scaesic is offline scaesic  United Kingdom
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15-0-15 trafo providing around +/-20V into 8 ohm speaker
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Old 5th July 2007, 02:47 PM   #4
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Ohm's law says I = V / R

So I = (20 x 0.707) / 8 = 1.77 amps

Use a 2A fast/quick blow fuse
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Old 5th July 2007, 03:21 PM   #5
AndrewT is offline AndrewT  Scotland
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Hi,
you might get away with F1.6A in the supply rails after the main smoothing caps.
These fuses would allow continuous peak currents of about 3.2A to flow to the speaker. That is equivalent to 40W into 8r0, way above what this proposed amp can send into an 8ohm speaker.
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Old 5th July 2007, 04:14 PM   #6
scaesic is offline scaesic  United Kingdom
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the reason i asked is i gutted a tda2030 commercial amp and it had a 160ma fuse, can anyone explain this?

also, i plan to have the fuse before the traffo.
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Old 5th July 2007, 05:06 PM   #7
AndrewT is offline AndrewT  Scotland
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AGH!!!
mains fusing is a different ballgame.
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Old 5th July 2007, 07:52 PM   #8
scaesic is offline scaesic  United Kingdom
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so what fuse rating ?
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Old 5th July 2007, 09:33 PM   #9
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Ipri = (Idc / 0.62) x (Vsec / Vpri)

= (1.77 / 0.62) x (30 / 230)

= 0.372A

So use 400mA slow blow / time delay
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Old 6th July 2007, 01:24 AM   #10
Leolabs is offline Leolabs  Malaysia
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2A will do.
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