Hi, I was actually referring to the SMD caps and power regulator on the controller board. I fully understand and appreciate the reasons for placing the SMD caps on the crystal filter. Thanks, Mac AE5PH On 02/01/2014 10:51 PM, pakdeDar wrote:
Hi Mac AE5PH, Your question about smd cap for the filter in Adrian's pcb design has been discussed by Jerry and Adrian on January 23, 2014. Please see the relevan archieve in Freelist/Minima This discussion related to smd cap in Minima's pcb, not in advantage-dissadvantage of using smd as a general. Regards, Sudarmanta. YC1DCN Kaspa-kaspaanlayauw ® -----Original Message----- From: "Mac A. Cody" <maccody@xxxxxxx> Sender: minima-bounce@xxxxxxxxxxxxx Date: Sat, 01 Feb 2014 16:45:02 To: <minima@xxxxxxxxxxxxx> Reply-To: minima@xxxxxxxxxxxxx Subject: [minima] Re: Minima PCB (eagle cad's) I have some questions about the parts selection for Adrian's Arduino controller board. First, what type of package is used for the LM1117? It appears to be DPAK, although I am not sure. Two leads appear to be of the through-hole type, while the voltage output is a tab. Perhaps the voltage output lead is not being used. Second, is there a compelling reason for using surface-mount devices for the 22 pF capacitors attached to the 16 MHz crystal? I can understand that leaded parts would introduce inductance, but I wouldn't think that the clock speed on the Arduino would be all that critical. There is certainly enough board space to use through-hole capacitors where they are located. It would be nice to minimize the number of components with specialized packaging in order to reduce cost and increase the likelihood of part availability. Perhaps it might not be too late to make a couple of "small" changes in Adrian's design with this in mind. Regards, Mac AE5PH