tag:blogger.com,1999:blog-5126379320954837196.post3732134290261453742..comments2024-03-27T20:45:18.731+00:00Comments on A Slice of Raspberry Pi: Finalizing the design of the Raspberry Pi Wobbulator PCBAnonymoushttp://www.blogger.com/profile/11488906443227944136noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-5126379320954837196.post-3309306364393757282013-12-09T13:08:09.242+00:002013-12-09T13:08:09.242+00:00Hello Rudolf,
Thank you for your very helpful com...Hello Rudolf,<br /><br />Thank you for your very helpful comment. I realize that this explains the difference in the heights of the peaks, but what I don't understand is why the peak when using the AD8307 is at a slightly lower frequency. As I mentioned above, I con only assume that this is due to the capacitance on the input to the AD8307 chip.<br /><br />Why not join the "rpiwobbulator" Yahoo group for the latest information and to contribute to the project.<br /><br />Kind Regards,<br /><br />TomAnonymoushttps://www.blogger.com/profile/11488906443227944136noreply@blogger.comtag:blogger.com,1999:blog-5126379320954837196.post-64896997013784979512013-12-09T13:03:11.655+00:002013-12-09T13:03:11.655+00:00This should be possible, and I can certainly see t...This should be possible, and I can certainly see the attraction of going "portable". There may be some GPIO pin reassignments necessary, but that shouldn't be a problem - perhaps a good reason to make the GPIO pins selectable (see previous comment).<br /><br />Why not join the "rpiwobbulator" Yahoo group for the latest information and to contribute to the project.<br /><br />Kind Regards,<br /><br />TomAnonymoushttps://www.blogger.com/profile/11488906443227944136noreply@blogger.comtag:blogger.com,1999:blog-5126379320954837196.post-56100127318640834712013-12-09T12:57:28.334+00:002013-12-09T12:57:28.334+00:00I haven't made the GPIO pins user selectable b...I haven't made the GPIO pins user selectable because the software needs to "know" which pins to use. If the GPIO pins used were selectable, the user would have to set the pins on the board and in the software. This would of course be possible to implement, but I've tried to make it as easy to use as possible.<br /><br />Why not join the "rpiwobbulator" Yahoo group for the latest information and to contribute to the project.<br /><br />Kind Regards,<br /><br />TomAnonymoushttps://www.blogger.com/profile/11488906443227944136noreply@blogger.comtag:blogger.com,1999:blog-5126379320954837196.post-84539535643230600182013-12-09T09:53:11.385+00:002013-12-09T09:53:11.385+00:00Hello Tom, the difference in the "response pe...Hello Tom, the difference in the "response peak" can be explained by the nearly linear response of the the diode rectifier on one hand, and the logarithmic response of the AD8308 on the other hand. <br />While the diode circuit has a dynamic range of about 30 to 40 db, the AD8307 will have about 90 db.<br />The DC bias of the diode has the benefit of increasing the sensitivity, but with the drawback of increased temperature sensitivity. For me, the best would be the AD8307 plus a FET probe with a low input capacitance.<br />Best regards, Rudolf DL5FARudihttps://www.blogger.com/profile/03028332030005068509noreply@blogger.comtag:blogger.com,1999:blog-5126379320954837196.post-13955288457253853932013-11-30T18:50:48.119+00:002013-11-30T18:50:48.119+00:00Any chance of making this stackable between the Pi...Any chance of making this stackable between the Pi and a PIFACE CONTROL & DISPLAY unit ?<br />That way data can be collected and recorded as a 'portable' unit for later analysis.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5126379320954837196.post-90651481106743640722013-11-26T21:47:06.999+00:002013-11-26T21:47:06.999+00:00I would prefer that the Raspberry Pi GPIO PIns use...I would prefer that the Raspberry Pi GPIO PIns used were link selectable.Anonymousnoreply@blogger.com