The µSupply suggestions - Page 1
Forum section: electronics / general

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: May 19, 2012, 10:56:58 am
content: Dear DaveThanks for your great work.I have some suggestions for your supply.1-why not use the preboost regulator as the final output, why not eliminating the linear stuff? Why not using just switch mode supply? Or why not using the MCU to do Switch mode stuff?2-as you probably know allegro has made devices for current measurement, they use hall effect for measuring current and they have a very low impedance path for measurement, why not use a ACS712 part? in this way you can eliminate the current sense power dissipation completely! It uses just a 1.2mOhm resistance!You are already wasting 1w in your 1ohm current sense circuit.3-why not using just a more modern MCU, like cortex-m with more I/O lower price and a 12-16bit adc? you can go with cortex m0 from st, they have 12bit adc and are very cheap and they can go to 48MHz,or why not use a cortex m4 from free scale? they have 16Bit adc and are damn cheap too?

author: Rerouter
author_rank: Super Contributor
timestamp: May 19, 2012, 11:16:45 am
content: 1. switchmodes have rather harsh harmonics and noise that needs to be filtered out, the linear is good for 100KHz, and an LC filter in between the stage can easily clip it down to that,2. hall effect devices are somewhat unreliable as noise from the switching regulator inductor could well make it read nonsense,3. pic and atmel are more hobby grade, which he was aiming for, not commercial production,

author: T4P
author_rank: Super Contributor
timestamp: May 19, 2012, 01:09:11 pm
content: Cortex M4 ? He wanted something easy to prototype ...Cortex M4 BTW costs 20$ ... AND THAT'S NOT CHEAP! [text deleted]

author: Rerouter
author_rank: Super Contributor
timestamp: May 19, 2012, 01:15:17 pm
content: very fair point dave.s , if a little sharp at the tounge :/

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: May 19, 2012, 01:47:07 pm
content: QuoteHey jerk he is already into SMD, and wanted to machine solder the boards, and by using a better MCU he could have probably eliminate the cost of external ADC, DAC and Refrence Voltage and IO expander chips! He can buy Cortex m4 @ 10USD in single qty (MK20DX128ZVLQ10) with 16bit adc or he can use Cortex m0 with 12bit adc @ very low prices!Try to be not miserable by just using AVR or PIC! You idiot fan boy!And he can use Keil MDk for free till 32K bytes of code!

author: ColinA
author_rank: Contributor
timestamp: May 19, 2012, 03:36:55 pm
content: /major fail on this thread..

author: SeanB
author_rank: Super Contributor
timestamp: May 19, 2012, 03:38:01 pm
content: Dave, Iranian Ali is trying to dilute your scotch..........BTW, looked yesterday and i have a whole tot of tag strips, just lying around........

author: T4P
author_rank: Super Contributor
timestamp: May 19, 2012, 04:27:17 pm
content: Quote from: SeanB on May 19, 2012, 03:38:01 pm"Dilute your scotch" Err ... i don't get it.... Nothing makes me rage more then tagboards and wire wrappers

author: SeanB
author_rank: Super Contributor
timestamp: May 19, 2012, 04:37:41 pm
content: Add foreign substances to it, like water and other useless stuff ......You feel like introducing him to the varied uses that a tagboard has, other than as a solder holder.

author: T4P
author_rank: Super Contributor
timestamp: May 19, 2012, 04:41:38 pm
content: Quote from: SeanB on May 19, 2012, 04:37:41 pm

author: Simon
author_rank: Unknown
timestamp: May 19, 2012, 05:43:23 pm
content: I'm not sure how this thread started, it looked looked at bit inflammatory from the start. If you can't keep your shirt on gents please just leave it alone.

author: chrome
author_rank: Regular Contributor
timestamp: May 19, 2012, 06:01:49 pm
content: Hey dave.s how about stop being such an asshole (in general)? Does that sound like a plan?

author: Simon
author_rank: Unknown
timestamp: May 19, 2012, 06:03:59 pm
content: ending this silly thread sounds more like a plan. If necessary I will lock the topic.