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Re: Turning on 5V from 1.8V with little/no current

 by angelsix ¦  Tue Apr 09, 2013 1:20 am ¦  Forum: SparkFun Product Questions ¦  Topic: Turning on 5V from 1.8V with little/no current ¦  Replies: 8 ¦  Views: 1341

Yes nice idea I'll do that. Thanks again.

Re: Turning on 5V from 1.8V with little/no current

 by angelsix ¦  Mon Apr 08, 2013 1:47 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Turning on 5V from 1.8V with little/no current ¦  Replies: 8 ¦  Views: 1341

Thanks guys for all the really useful posts. The SI2336DS looks perfect, very low turn on voltage in a FET and low-side instead of high side, with large current. I'll order that and give it a go. Price is high but sure I can get that down with larger volume. rrpilot: The 100k resistor to ground, is ...

Turning on 5V from 1.8V with little/no current

 by angelsix ¦  Mon Apr 08, 2013 5:17 am ¦  Forum: SparkFun Product Questions ¦  Topic: Turning on 5V from 1.8V with little/no current ¦  Replies: 8 ¦  Views: 1341

Ok I want to make a little board that I would use in so many of my projects, and it's something I always end up needing in various versions and voltages, so I want to make one that will hopefully suit all. Requirements Input: To turn on circuit I would like ideally to be as low as about 1.2V, but 1....

Re: Inverted Pulsed output to steady output

 by angelsix ¦  Wed Jul 04, 2012 9:24 am ¦  Forum: SparkFun Product Questions ¦  Topic: Inverted Pulsed output to steady output ¦  Replies: 6 ¦  Views: 857

Yes that's correct. What I have is an LED connection that is constant high at the pos, and 3V at the neg when off, then when on it is pulsed to ground at around 10kHz. Now I don't want any pulsing I want pure 100% on time, so yes you are correct in what you are thinking. Thanks for your time. For th...

Re: Inverted Pulsed output to steady output

 by angelsix ¦  Wed Jul 04, 2012 7:25 am ¦  Forum: SparkFun Product Questions ¦  Topic: Inverted Pulsed output to steady output ¦  Replies: 6 ¦  Views: 857

Nice thanks. What simulation software have you used? I like the idea but its quite a lot of components I am trying to fit this into an incredibly small area and all hand soldering so want it really basic if possible. Here is what I was thinking last night but I havent got any software to test it, an...

Inverted Pulsed output to steady output

 by angelsix ¦  Tue Jul 03, 2012 11:29 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Inverted Pulsed output to steady output ¦  Replies: 6 ¦  Views: 857

I'm trying to solve a simple solution elegantly with as few components as possible. What I have is a 3V signal that when "off" is a constant 3V. When on it pulses to 0V for 100us, then back to 3V for 150us, then back to 0V over and over. What I want is to have a constant output of 0V when the input ...

Re: ARM Cortex with more than 8 ADCs?

 by angelsix ¦  Sun May 13, 2012 12:31 pm ¦  Forum: Everything ARM and LPC ¦  Topic: ARM Cortex with more than 8 ADCs? ¦  Replies: 22 ¦  Views: 6601

Ok I've got CrossWorks and Keil installed now and can connect the L discovery up to it and program it no problem so I am good to go starting on that. Any good resource sites for sample codes and basic tutorials to get me started on porting over from Microchip? The next question is basically how do y...

Re: ARM Cortex with more than 8 ADCs?

 by angelsix ¦  Fri May 11, 2012 9:47 am ¦  Forum: Everything ARM and LPC ¦  Topic: ARM Cortex with more than 8 ADCs? ¦  Replies: 22 ¦  Views: 6601

@stevech - bugs, well I've worked with PICs for a good while from assembly coding them up to about 4kb programs until it just got too time consuming (I really like sticking to ASM as know exactly what goes on, unlike leaving it to a compiler and linker) and didn't really have any bugs just the odd s...

Re: ARM Cortex with more than 8 ADCs?

 by angelsix ¦  Wed May 09, 2012 9:15 am ¦  Forum: Everything ARM and LPC ¦  Topic: ARM Cortex with more than 8 ADCs? ¦  Replies: 22 ¦  Views: 6601

Cool thanks that STM32 looks pretty sweet - so much more power and features than the PICs I'm using.... exciting. Is there a good dev board with one on save me making up a proto PCB or breadboard just to get used to the new coding and what not?

ARM Cortex with more than 8 ADCs?

 by angelsix ¦  Wed May 09, 2012 12:11 am ¦  Forum: Everything ARM and LPC ¦  Topic: ARM Cortex with more than 8 ADCs? ¦  Replies: 22 ¦  Views: 6601

I'm looking to migrate a product from Microchip (due to many bugs with them I have found when getting to large 20kb+ size code with many different PICs). It took a good while to figure out what ARM products are what, 8bit, 16bit, 32bit, what is top spec and low spec, and generally finding out any di...

Octal Analog switch, cheaper than £3! ?

 by angelsix ¦  Fri Dec 02, 2011 11:18 am ¦  Forum: SparkFun Product Questions ¦  Topic: Octal Analog switch, cheaper than £3! ? ¦  Replies: 0 ¦  Views: 250

Ok so analog switches no problem, 5p. Go to quad analog switches, 30p, I need 7 channels so the next logical chip should be an 8 channel... problem. I've searched the internet high and low, RS, Farnell, DigiKey, Future, Rapid etc... and I cannot find any analog switches above 4 channels that are ind...

Re: Stepping down mains AC 230V to approx 180V

 by angelsix ¦  Sat Nov 12, 2011 10:28 am ¦  Forum: SparkFun Product Questions ¦  Topic: Stepping down mains AC 230V to approx 180V ¦  Replies: 11 ¦  Views: 1366

Ah yes sorry forgot to mention the reason. Basically a friend has bought a underfloor heating matt, and cut off a portion of if thinking he can just do that, so now instead of having the original resistance in the wire mat, he has taken some of the resistance out. I worked out from the original powe...

Stepping down mains AC 230V to approx 180V

 by angelsix ¦  Mon Nov 07, 2011 3:59 am ¦  Forum: SparkFun Product Questions ¦  Topic: Stepping down mains AC 230V to approx 180V ¦  Replies: 11 ¦  Views: 1366

Just after stepping down mains AC voltage, needs to pass through 10Amp at the 180V.

Any ideas of ICs or circuits to step it down, other than a huge transformer?

Re: 1.8 to 3V signal -alternate to PNP, NPN & lots of resistors?

 by angelsix ¦  Mon Jul 18, 2011 4:12 am ¦  Forum: PCB Design Questions ¦  Topic: 1.8 to 3V signal -alternate to PNP, NPN & lots of resistors? ¦  Replies: 2 ¦  Views: 820

Spot on thanks - Got a level shifter from ON Semi that is pretty much identical but cheaper too. I knew there was a name for the type of device but with not using them much before I totally forgot.

1.8 to 3V signal -alternate to PNP, NPN & lots of resistors?

 by angelsix ¦  Sun Jul 17, 2011 1:53 am ¦  Forum: PCB Design Questions ¦  Topic: 1.8 to 3V signal -alternate to PNP, NPN & lots of resistors? ¦  Replies: 2 ¦  Views: 820

Pretty simple question but after hours of searching I cannot find what I am sure must already be a standard IC with a specific name but the name is what I cannot find. I have a DC boost IC that needs a 3V signal enable pin, so it needs 3V to turn on. Now my actual trigger pin only has 1.8V. I want t...

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