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Re: Project advice - Multiple audio in, single out, auto switch

 by angelsix ¦  Wed Jan 05, 2011 6:25 am ¦  Forum: SparkFun Product Questions ¦  Topic: Project advice - Multiple audio in, single out, auto switch ¦  Replies: 14 ¦  Views: 1482

Thanks for the replies. Yes I figure an analog mux would be the way to go so will read up on the datasheets of the SF ones and find a similar one for my use. I presume the only thing that matters is to pass enough current (think line level audio is far less than 100mA?) so most will do, and low on r...

Project advice - Multiple audio in, single out, auto switch

 by angelsix ¦  Tue Jan 04, 2011 2:05 am ¦  Forum: SparkFun Product Questions ¦  Topic: Project advice - Multiple audio in, single out, auto switch ¦  Replies: 14 ¦  Views: 1482

Simple idea for my home - what I have is several input audio sources (stereo phono leads) that go to my sound system that accepts just a single stereo phono. At the moment I have to keep swapping the wires over. What I want is an automated switch. Only one sound source should be active at any one ti...

Re: White, Red, Blue or other color PCBs... where from?

 by angelsix ¦  Tue Dec 07, 2010 2:54 am ¦  Forum: PCB Design Questions ¦  Topic: White, Red, Blue or other color PCBs... where from? ¦  Replies: 9 ¦  Views: 2033

Cool thanks for all the links guys. I am just awaiting the fastest delivery time available from OpenPCB and I should be placing the order. I must say their prices appear fantastic, 300off of my board (16x50mm 2mm thick in blue PCB) only $0.31p each, plus a $40 one off tooling cost. Compared to here ...

White, Red, Blue or other color PCBs... where from?

 by angelsix ¦  Sun Dec 05, 2010 8:09 am ¦  Forum: PCB Design Questions ¦  Topic: White, Red, Blue or other color PCBs... where from? ¦  Replies: 9 ¦  Views: 2033

I usually use BatchPCB and they are brilliant for the price and the quality you get, but I have a project that really needs a different color board that the usual green, and am having trouble even finding a fabrication house that offers them. Anyone got any preferences to houses they use (I'm in the...

Re: 20x2 Red or Amber LCD screen?

 by angelsix ¦  Tue Sep 28, 2010 10:21 am ¦  Forum: SparkFun Product Questions ¦  Topic: 20x2 Red or Amber LCD screen? ¦  Replies: 5 ¦  Views: 691

The problem with the Mouser ones I forgot to mention are they are totally non-TTL compatible (CMOS) so cannot interface directly to 3.3V MCUs. Not a total killer and I can always fall back to those from Mouser if I find no others. Yes the CrystalFontz site I found but that is well expensive for the ...

20x2 Red or Amber LCD screen?

 by angelsix ¦  Mon Sep 27, 2010 3:04 pm ¦  Forum: SparkFun Product Questions ¦  Topic: 20x2 Red or Amber LCD screen? ¦  Replies: 5 ¦  Views: 691

I've been hunting high and low for days for basically a nice red or amber character LCD screen (or even blue) and cannot find anywhere to buy them. Mouser, Rapid, RS, Farnell, DigiKey, Active Robots, Cool Components, SF... I think RS have the odd blue back with white writing, which would do but are ...

Re: 240V AC to 12VDC 25A... suggestions.

 by angelsix ¦  Sat Aug 14, 2010 1:51 pm ¦  Forum: PCB Design Questions ¦  Topic: 240V AC to 12VDC 25A... suggestions. ¦  Replies: 8 ¦  Views: 1699

OK thanks for all the feedback guys, I guess the answer is that a computer PSU is the way too go as the most efficient route. I have brought a 580W HE (high efficiency) supply and that will do me just fine. I just thought I would check first in case there were other more efficient ways. Cheers again...

Re: 240V AC to 12VDC 25A... suggestions.

 by angelsix ¦  Sat Aug 14, 2010 1:59 am ¦  Forum: PCB Design Questions ¦  Topic: 240V AC to 12VDC 25A... suggestions. ¦  Replies: 8 ¦  Views: 1699

Yes I was thinking of basically PSU supplies but I was concerned about the efficiency of transformers and that's why I was wondering if there was any kind if ICs out there similar to DC-DC Switch mode regulators but AC-DC instead, and at this rating, but I don't think there are? How efficient are tr...

240V AC to 12VDC 25A... suggestions.

 by angelsix ¦  Fri Aug 13, 2010 7:58 am ¦  Forum: PCB Design Questions ¦  Topic: 240V AC to 12VDC 25A... suggestions. ¦  Replies: 8 ¦  Views: 1699

OK I need to step down mains voltage to 12V, and the 12V side needs 25A approx. Any thoughts on ways to approach this? I presume the first thing is to convert the AC to DC, then switch regulate it down to 12V? If so, what is recommended for efficiency - bridge rectifier/diode -> switching regulator....

Re: microscopes for PCB inspection?

 by angelsix ¦  Tue Jul 27, 2010 6:47 am ¦  Forum: PCB Design Questions ¦  Topic: microscopes for PCB inspection? ¦  Replies: 14 ¦  Views: 11890

I found the 300x USB scope from Maplins or any standard retailer does a pretty good job. If I had the money I would love a better one though.

Leon, do you have a UK supplier for the paper composite board as I cannot find it?

Micro vibrator motors - Suppliers

 by angelsix ¦  Wed Jun 16, 2010 5:27 am ¦  Forum: SparkFun Product Questions ¦  Topic: Micro vibrator motors - Suppliers ¦  Replies: 3 ¦  Views: 1725

I have looked high and low for a supplier but cannot find anyone that sells them. I am after the tiny motors commonly found in mobile phones etc... that vibrate as an alert.

I have looked on RS, Farnell, Misco, Mouser, DigiKey... not a one supplies them. Any help?

Re: Ultrasonic Transmitter Circuit

 by angelsix ¦  Thu Apr 01, 2010 5:31 am ¦  Forum: SparkFun Product Questions ¦  Topic: Ultrasonic Transmitter Circuit ¦  Replies: 4 ¦  Views: 648

If it is the indoor (open can) type then yes fine to connect it right up. Provide it with around 30mA should be more than enough. Outdoor ones will need driving a lot higher voltage (at least all the ones I have found so far need too). If you get stuck along the way I have full schematics and boards...

Re: COLOR NOKIA E51 LCD IS FINALLY HACKED 240x320 Pixels

 by angelsix ¦  Thu Apr 01, 2010 5:30 am ¦  Forum: SparkFun Product Questions ¦  Topic: COLOR NOKIA E51 LCD IS FINALLY HACKED 240x320 Pixels ¦  Replies: 10 ¦  Views: 14976

I figured the cheapness was a nice option, I liked programming the £3 Nokia black and white screen. However, from any form of non-commercial use (or mass use)surely they aren't really bothered about saving £5 and wasting hours hacking it. From a commercial front or mass use you would save a lot more...

Re: Laptop supply from AA batteries?

 by angelsix ¦  Mon Mar 29, 2010 7:35 am ¦  Forum: SparkFun Product Questions ¦  Topic: Laptop supply from AA batteries? ¦  Replies: 10 ¦  Views: 1258

Ah right thought something must be off, ye so the current is not going to increase obviously. So, on to plan 2. Are there any really high current batteries that I could use that are about the size of a laptop battery? My plan is to have a "spare" battery I can have at the side of the laptop while ou...

Laptop supply from AA batteries?

 by angelsix ¦  Mon Mar 29, 2010 6:12 am ¦  Forum: SparkFun Product Questions ¦  Topic: Laptop supply from AA batteries? ¦  Replies: 10 ¦  Views: 1258

I've just brought another laptop and checked out the battery life (still only 3 hours as its a power laptop) :( I took a look at the specs and it states 11.5V 3500mA/h... now surely they would be more than that? This got me thinking... if that is all they supply, could I not just series together 10A...

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