Sorry about the delayed reply, I hadn't circled back to the thread until now. Interesting! Were you using the ARDZ version with the metal power pad or the ARZ without? I'm wondering if that makes a difference.
If I remember correctly I used version with exposed pad for better heat dissipation but I had other AD8397 projects using regular version (non exposed pad) and op-amp wasn't even warm on +/-13.3 to +/-12.6V rails (two 12v gel accu).
This is my current project, main boards are from 2015, zero problems. Main thing is to use high wattage output resistor and use only one op-amp for one channel, second channel should be terminated correctly, this helps keeping tmp low.
This is my current project, main boards are from 2015, zero problems. Main thing is to use high wattage output resistor and use only one op-amp for one channel, second channel should be terminated correctly, this helps keeping tmp low.
An externally hosted image should be here but it was not working when we last tested it.
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I haven't written off the NJM4556A yet. I'll do proper listening tests with different material.
Yes, the OPA1688 goes to 70/300mV from the rails. The OPA1622 goes to +-900mV. That is a plus. It's relatively easy to bump up the supply rails. But the same rails that power the amp also power some LDOs with a maximum +6V in. That's why I'm at +-5.8V at the time.
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Yes, the OPA1688 goes to 70/300mV from the rails. The OPA1622 goes to +-900mV. That is a plus. It's relatively easy to bump up the supply rails. But the same rails that power the amp also power some LDOs with a maximum +6V in. That's why I'm at +-5.8V at the time.
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