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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hadn’t noticed the 1678 had dropped to that price so yes you’re right.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">5532 is $0.09 cents 1ku, Rs &* Cs $0.03, PCB area for it is about $0.015 and assembly $0.02.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">So a stereo 2*5532 design costs $0.31 vs 1*1678 design at $0.30. This assumes you can dissipate any heat within that PCB area assigned, but you’d probably
need to increase both designs by the same amount if not.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I’ll definitely change to the 1678 in future.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Martin Klang [mailto:mars@pingdynasty.com]
<br>
<b>Sent:</b> 09 September 2021 17:05<br>
<b>To:</b> Mike Bryant; synth-diy@synth-diy.org<br>
<b>Subject:</b> Re: [sdiy] headphone driver for synths<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p><o:p> </o:p></p>
<p>Cheaper perhaps in parts, not counting assembly and board space. And the OPA1678 is only about $0.25 in quantity. It's become my go-to audio op amp for all round good specs.<o:p></o:p></p>
<p>There's also the RC4560 which is about same price as the 5532.<o:p></o:p></p>
<p><o:p> </o:p></p>
<p>Martin<o:p></o:p></p>
<p><o:p> </o:p></p>
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<p class="MsoNormal">On 08/09/2021 22:23, Mike Bryant wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Yes the OPA1678 has a higher drive current than the 5532, but using both of the pair of a 5532 in parallel works out cheaper than half a OPA1678 per channel
provided you don’t mind the 4 times quiescent current (2* per opamp and 2 opamps).
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Noise and distortion are very similar, and far below what is audible.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
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