fuses for tda2050

scaesic · 4th July 2007, 04:32 PM

what current rating fuse should be used before the power section powering a tda2050?

AndrewT · 5th July 2007, 09:13 AM

Hi,
what supply voltage are you planning?
What speaker impedance do you intend using?

scaesic · 5th July 2007, 02:44 PM

15-0-15 trafo providing around +/-20V into 8 ohm speaker

richie00boy · 5th July 2007, 02:47 PM

Ohm's law says I = V / R

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

Use a 2A fast/quick blow fuse

AndrewT · 5th July 2007, 03:21 PM

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.

scaesic · 5th July 2007, 04:14 PM

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.

AndrewT · 5th July 2007, 05:06 PM

AGH!!!
mains fusing is a different ballgame.

scaesic · 5th July 2007, 07:52 PM

so what fuse rating ?

richie00boy · 5th July 2007, 09:33 PM

Ipri = (Idc / 0.62) x (Vsec / Vpri)

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

= 0.372A

So use 400mA slow blow / time delay

Leolabs · 6th July 2007, 01:24 AM

2A will do.

4th July 2007, 04:32 PM	#1
scaesic diyAudio Member Join Date: Jun 2007	fuses for tda2050 what current rating fuse should be used before the power section powering a tda2050?

5th July 2007, 09:13 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, what supply voltage are you planning? What speaker impedance do you intend using? __________________ regards Andrew T.

5th July 2007, 02:47 PM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Ohm's law says I = V / R So I = (20 x 0.707) / 8 = 1.77 amps Use a 2A fast/quick blow fuse __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

5th July 2007, 03:21 PM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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. __________________ regards Andrew T.

5th July 2007, 05:06 PM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	AGH!!! mains fusing is a different ballgame. __________________ regards Andrew T.


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

5th July 2007, 02:44 PM	#3
scaesic diyAudio Member Join Date: Jun 2007	15-0-15 trafo providing around +/-20V into 8 ohm speaker

5th July 2007, 04:14 PM	#6
scaesic diyAudio Member Join Date: Jun 2007	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.

5th July 2007, 07:52 PM	#8
scaesic diyAudio Member Join Date: Jun 2007	so what fuse rating ?

5th July 2007, 09:33 PM	#9
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Ipri = (Idc / 0.62) x (Vsec / Vpri) = (1.77 / 0.62) x (30 / 230) = 0.372A So use 400mA slow blow / time delay __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

6th July 2007, 01:24 AM	#10
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	2A will do.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Tda2050	Jpoole908	Vendor's Bazaar	0	1st June 2008 06:34 PM
TDA2050 parallel. HELP!	Matthewong	Chip Amps	5	9th March 2006 03:47 AM
Tda2050	Mr. Triatic	Solid State	8	26th April 2004 06:00 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read