/members-area/personalblogs/b/blog/posts/arduino-r-2r-setting-the-output-frequencyI&#39;ve made a bit more progress. I now have my test code connected to the SCPI parser. That was very easy to do: I simply copied their generator example, took out the lines specific to the chip they were using, and adapted it slightly to calculate ...en-USTelligent Community 12https://community.element14.com/members-area/personalblogs/b/blog/posts/arduino-r-2r-setting-the-output-frequencyThu, 26 Apr 2018 00:50:24 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:774ec304-9b55-4165-a2f8-2b1543be04faJan Cumps1<p>for the PuTTY settings, you may have to turn on local echo, so that you see what you type, and maybe CR + LF. it works reliable with the Arduino Serial Monitor if you have the speed setting correct.</p><img src="https://community.element14.com/aggbug?PostID=4718&AppID=293&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/members-area/personalblogs/b/blog/posts/arduino-r-2r-setting-the-output-frequencyWed, 25 Apr 2018 15:24:39 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:774ec304-9b55-4165-a2f8-2b1543be04fafmilburn0<p>A nice well documented series - I have enjoyed following along.&nbsp; </p><img src="https://community.element14.com/aggbug?PostID=4718&AppID=293&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/members-area/personalblogs/b/blog/posts/arduino-r-2r-setting-the-output-frequencyWed, 25 Apr 2018 15:01:27 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:774ec304-9b55-4165-a2f8-2b1543be04fagenebren1<p>Jon,</p><p>&nbsp;</p><p>The problem with the frequency roll off at 20Khz may be more a question of your op-amp as opposed to your filter.&nbsp; The LM324 has a gain bandwidth of 1.3Mz and the gain rolls off to ~30% of the total gain at 20KHz.</p><p>&nbsp;</p><p>Gene</p><img src="https://community.element14.com/aggbug?PostID=4718&AppID=293&AppType=Weblog&ContentType=0" width="1" height="1">