<div dir="ltr">Thanks Andy! I still had my resistors and caps on my breadboard and hooked up a 2N3904 and plugged in the power and the Tiny Speaker Test agrees that it works decently.</div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Apr 4, 2017 at 9:41 PM, Andrew Simper <span dir="ltr"><<a href="mailto:andy@cytomic.com" target="_blank">andy@cytomic.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">One way to avoid some of the volume drop is to use a 2 pole sallen key<br>
BJT filter with a cascaded passive stage. This is a common circuit<br>
used around BBD chips, eg:<br>
<br>
<a href="http://www.hobby-hour.com/electronics/s/schematics/boss-ce2-chorus-schematic.gif" rel="noreferrer" target="_blank">http://www.hobby-hour.com/<wbr>electronics/s/schematics/boss-<wbr>ce2-chorus-schematic.gif</a><br>
<br>
Andy<br>
<span class="im HOEnZb"><br>
On 4 April 2017 at 19:50, Elaine Klopke <<a href="mailto:functionofform@gmail.com">functionofform@gmail.com</a>> wrote:<br>
> Thanks for the info Tom!<br>
><br>
> Magnus, the sources are fixed square waves coming from a set of PIC chips. So the fixed filtering doesn't bother me a bit. One filter for one frequency. What worries me is the volume drop.<br>
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