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This is a edit to my last post
I just found something online that talked about sizing the cap. It said that C=(Current*period)/how big your voltage dip can be so C = (2 Amp * ((1/60 Hz)/2)/(25.4-5.3)V= 829 uF. Bump it up to 1200 uF to be safe. Sound sane?
Great SunnySkyguy this is what I need to learn.
ripple current peak/average: 0.140A/0.078A = 1.795 ...... Well for the pulse width...Hmmm....I am regulated to 4V and lets say that out of the transformer I get 36V/sqrt(2). so to get an average of 4V from 25.4 VRMS it would be 4/25.4VRMS =...
I have a project that for past versions I have been using a DC power supply. To take it to the next level, I would like to the AC to DC conversion on my PCB. This is my first time ever specking out parts to do this and I am wondering if I have the right process. I will take you through my...
Wait Klaus that is exactly what I am planning on doing. 15 pads 15 connections 15 solder joints and 53 pins left without connection simply resting on top the solder mask. Will this be okay.
I have a chip that has 68 pins at 1 mm spacing (SIM900). I know it is not a really tight package but I have some problems with shorts between pins when I am hot air reflowing. Anyway my thought was that I only use probably 15 of the 68 pins so what if I designed my PCB to not have pads for the...
I know that no one may ever see this but this message is meant to be a message of hope. I was having this same problem but never could figure out what was wrong. I checked the connections of my sim card 20+ times. I "knew" everything was right! Tonight I said "FINE!" and tore off all the...
I have attached a snip of all the places I found it was mentioned. I am not sure why it specifies this condition.
My questions about it are:
1. Does this mean that transmission from uC to Sim900 needs to be at 2.8V or can it be at something nicer for me like 3.3V?
2. Do I really need to...
I am looking to use the SIM900 module. I see that the module's power supply is from 3.2 V to 4.8 V. I will be running it with an ATMEGA328P microprocessor who's power supply range is from 1.8 V to 5 V. Naturally I would like to choose a power supply between 3.2 V to 4.8 V and simply use one...
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