"The Wire" Ultra-High Performance Headphone Amplifier - PCB's - Page 185 - diyAudio
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Old 3rd June 2013, 09:13 PM   #1841
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Yes, I know. Just been having problems wiring up my switch.
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Old 3rd June 2013, 09:36 PM   #1842
JBdV is offline JBdV  Netherlands
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maybe using it just as a single pole on/off switch for now by only wiring one mains wire through the switch can save fuses ....???
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Old 3rd June 2013, 10:05 PM   #1843
opc is offline opc  Canada
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Quote:
Originally Posted by qusp View Post
what size were you using? you might have to look for another reason the fuses are popping ... the current draw on this amp is VERY small; 0.5A @ 120V is 60W, the amp draws less than 5W, and I doubt the inrush current is too huge. I would think 0.2A would be more than enough.
yeah... I'd second that.

After all the confusion with the switch, and the fact that indeed the circuit doesn't draw more than a few dozen mA from the mains means you have a serious problem if you're blowing fuses, even really low current ones. The only exception to this is if you're using a monster size toroid which may have enough magnetization current to blow a low current fuse. If that's the case, you'll have to size the fuse accordingly.

Also, not to be rude, but if you really can't get the stuff on the primary side sorted, you really need to get someone to help you. Messing things up there can get you badly hurt, or burn down your house, or injure someone else. Unless you know exactly what you're doing, you shouldn't be playing with any circuit operating at mains voltages. I'm being very serious about this... if I were you I would stop and get some assistance from someone who knows what they're doing.

Regards,
Owen
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Old 6th June 2013, 12:09 AM   #1844
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Ok, no worries. I've wired it up correctly, as per Swalter diagram. Wired earth ground to the chassis too. Put in a 750ma fuse.

Sounds awesome btw.

Thanks for all your help.

I've put it in a large case... I might stick a small dac into it.
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Old 6th June 2013, 12:52 AM   #1845
opc is offline opc  Canada
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Excellent!

Glad to hear you're up and running.

Enjoy

Cheers,
Owen
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Old 6th June 2013, 12:57 AM   #1846
qusp is offline qusp  Australia
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thats great! nice one, but you might want to look at getting a fuse in there that will blow before the power supply self destructs. fuses are meant to provide enough headroom for the load plus a little bit, not 20x the load current
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Old 6th June 2013, 02:18 AM   #1847
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what size are you suggesting?
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Old 6th June 2013, 02:24 AM   #1848
qusp is offline qusp  Australia
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I cant suggest anything without knowing exactly what transformer and power supply you are running. with a transformer that is just big enough at say 8-10VA and the standard power supply. I already suggested 0.2A as being more than enough. a fuse is not a fuse if it doesnt trip in a fault condition until its too late.
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Old 6th June 2013, 05:20 AM   #1849
opc is offline opc  Canada
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A new run of these boards is now available!

Please see the following thread for details:

http://www.diyaudio.com/forums/solid...ml#post3516741

Cheers,
Owen
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Old 26th June 2013, 09:51 AM   #1850
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Posts deleted... lets keep it "topic and technical".
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