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Chip Amps Amplifiers based on integrated circuits

DC offset like crazy... OPA541- HELP!
DC offset like crazy... OPA541- HELP!
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Old 21st June 2003, 08:14 PM   #11
pinkmouse is offline pinkmouse  Europe
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DC offset like crazy... OPA541- HELP!
I have built GCs with LM1875, 3875, OPA548 and 549, and just about all the circuit variations, and I have never had more than 50mV offset on one that worked properly, so as long as your design is sound you should have no problems with vaporised VCs due to offset.
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Old 21st June 2003, 09:31 PM   #12
Nuuk is offline Nuuk  United Kingdom
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My speakers have extremely fine wire in the voice coils and no crossovers.
I empathise with you Panelhead but even with a straight wire to ground you shouldn't get more than 30mV.

One of my Arcam A60's puts out 28mV and has done for years. It hasn't harmed either my active speakers or my Goodmans 201's full-rangers, neither of which use crossovers.

Having said that, I will probably revert to speaker protection for a while when I connect these speakers to the GCs!
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Old 23rd June 2003, 09:49 AM   #13
miguel2 is offline miguel2  Portugal
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I tried an inverted design using OPA541's and the chips were cold (room temperature), even after playing for a long time. From my experience, I could use them even without heatsink. Maybe you have something there...

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