Re: [Homebrew_PCBs] How to DO thermocouple interfacing
2006-08-25 by Ross McKenzie
...and the two high valued resistors, eg 10Mohm, one from ground to IS2 and the other from IS2 to supply rail?
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Re: [Homebrew_PCBs] How to DO thermocouple interfacing
2006-08-25 by Herbert E. Plett
yep, just a cap to keep out noise and two high valued resistors to force open TC into infinity. I just chose the polarity so as to make the scaling easier. I
Re: [Homebrew_PCBs] How to DO thermocouple interfacing
2006-08-25 by Ross McKenzie
Thanks. So you are suggesting using the IS1 and IS2 pins without any current sense resistor (internal or external). Is that correct? Regards, Ross
Re: [Homebrew_PCBs] How to DO thermocouple interfacing
2006-08-25 by Herbert E. Plett
don t get fooled by the title. the DS2761 chip has two voltage inputs, one resolves 15uV in +-32mV (direct connection of thermocouple up to 500C) and the other
Mixed digital-analog layout
2006-08-25 by Adrian
I read some articles about this problem and all talk about star groundind, but nothing about power supply line. Let s supose we have a simple
Re: Direct PCB printing with Epson Stylus color 440
2006-08-25 by Andrew
... I think that ST is talking about direct- inkjet printing. This might be different to printing onto JetStar film or good trannys that have a gel coat. The
Re: [Homebrew_PCBs] Direct PCB printing with Epson Stylus color 440
2006-08-25 by Russell Shaw
... Older epsons starting from the 720dpi stylus-400 colour are perfectly ok for tracks of 10mil. Crap printouts only happen when crap ink and/or transparency
RE: [Homebrew_PCBs] Re: How to DO thermocouple interfacing
2006-08-24 by John Craddock
Steve, Sorry to tread on your toes! If you read my post carefully you will note an alternative suggestion that concurs with your original point. I consider
Re: [Homebrew_PCBs] Temp Controller
2006-08-24 by Stefan Trethan
... You are crazy and i will not take advantage of you in that way ;-) I might be interested in one of your displays, i searched and could not find smaller
Re: How to DO thermocouple interfacing
2006-08-24 by Steve
... Yes, but it is squarely into electronic design now. We ve been over this before, if you try and say that anything remotely related to making PCBs is on
Re: Temp Controller
2006-08-24 by Andrew
Sorry all, This was meant for ST and it went to the list :S
Do we have a bet - was - Re: How to DO thermocouple interfacing
2006-08-24 by Andrew
... I bet I can do it for under $30 AUD* :P (with the LCD screen) *The $30 AUD would be the prices I get components for not the dicky smith / jaycar / radio
Temp Controller
2006-08-24 by Andrew
Offer is still open for me to make a PCB to fit your box dimensions. Solder on an ATMEL and a themrocuple sensor. DO all the programming and ship it off to
Re: How not to control ovens - was - The list is huge! Really huge!
2006-08-24 by Andrew
For the max6675 DigiKey USD 6.30 SparkFun USD 10.50 Get a couple other things cheaper from digikey than you can get em from dicky smith or jaycar and you are
RE: [Homebrew_PCBs] Re: How to DO thermocouple interfacing
2006-08-24 by John Craddock
Or maybe: - http://groups.yahoo.com/group/E-Z_Bake/ This thread is related to Stefan s toaster oven mods to be able to bake direct inkjet pcbs; and perhaps to
Re: How to DO thermocouple interfacing
2006-08-24 by Steve
Maybe MAX6675? Thermocouple input with built-in cold junction compensation, 12bit ADC. BTW, this needs to move to Electronics_101. I ve posted a rough
Re: [Homebrew_PCBs] Direct PCB printing with Epson Stylus color 440
2006-08-24 by Stefan Trethan
... Hey, i found the older epsons will not work because the resolution seems too low. The individual lines of ink it prints did not close up in my trial. I
Re: How to DO thermocouple interfacing
2006-08-24 by ross_valusoft
... digitizes with a ... connects to a uP ... directly from a ... (I use ... and a few ... (responsibility) to ... plus any ... with a two ... Hi Herbert. If I
Re: [Homebrew_PCBs] How to DO thermocouple interfacing
2006-08-24 by Stefan Trethan
On Thu, 24 Aug 2006 14:48:12 +0200, Herbert E. Plett ... I bet you can t do it under 20eur either... ST
Re: [Homebrew_PCBs] How to DO thermocouple interfacing
2006-08-24 by Ross McKenzie
Hi Herbert. If I am reading it correctly, the DS2761 is a High-Precision Li+ Battery Monitor . The datasheet says that its voltage measurement channel does so
How to DO thermocouple interfacing
2006-08-24 by Herbert E. Plett
... why so much complication? hardware is dead simple using a 1-wire interface from Dallas-Maxim. thermocouple feeds directly into an ADC (DS2761) that
Direct PCB printing with Epson Stylus color 440
2006-08-24 by Biulazz
Hello all, is somebody experienced with printing PCB with an old Epson Stylus color 440? I m gonna modifying it, and I ll be glad to get inspiration from
Re: How not to control ovens - was - The list is huge! Really huge!
2006-08-24 by Ian
... thermocouple interfacing. My problem with the max6675 is that Maxim lists the price at US$3.88 in 1K quantities. By the time I get a single unit to OZ it
Re: How not to control ovens - was - The list is huge! Really huge!
2006-08-23 by Larry Nicks
... with ... ................ You might want take a look at the Take-Back-Half controller idea discussed by Steven Woodward on page two of the EDN Design
Re: [Homebrew_PCBs] Re: How not to control ovens - was - The list is huge! Really huge!
2006-08-23 by Stefan Trethan
Ok, so i went and bought that elektor article. Took ages to sign up with that nonsense but in the end i got the pdf. Anyway, there is a lot less documentation
Re: [Homebrew_PCBs] Thermocouples and cold junction compensation Re: How to control ovens
2006-08-23 by Stefan Trethan
... Yes, this is all very well, but there is more. First, the compartment in the oven, even with insulation, gets pretty hot, so that makes it all worse than
Thermocouples and cold junction compensation Re: How to control ovens
2006-08-23 by Steve
We should probably move this to Electronics_101. ; ) A silicon diode can be used as a temp sensor for cold junction compensation for thermocouples. Very linear
Re: [Homebrew_PCBs] Tip: Repairing a HP LJ-III pickup roller.
2006-08-23 by Stefan Trethan
On Wed, 23 Aug 2006 12:31:53 +0200, Myc Holmes ... That s not something we have here... ST
RE: [Homebrew_PCBs] Re: How not to control ovens - was - The list is huge! Really huge!
2006-08-23 by John Craddock
Hi Philip, Yes, I read the article and have been doing some research of thermocouple interfacing. My problem with the max6675 is that Maxim lists the price at
RE: [Homebrew_PCBs] Re: How not to control ovens - was - The list is huge! Really huge!
2006-08-23 by John Craddock
Hi Philip, Yes, I read the article and have been doing some research of thermocouple interfacing. My problem with the max6675 is that Maxim lists the price at
RE: [Homebrew_PCBs] Tip: Repairing a HP LJ-III pickup roller.
2006-08-23 by Tony Smith
Turpentine works quite well, and is probably easier to find. At an old job one I the things I had to do requarly was dismandle the lasers and clear the
Re: [Homebrew_PCBs] Tip: Repairing a HP LJ-III pickup roller.
2006-08-23 by Myc Holmes
Try wintergreen flavoring from the grocery store. The main ingredient is oil of wintergreen. Myc ... [Non-text portions of this message have been removed]
Re: [Homebrew_PCBs] Re: How not to control ovens - was - The list is huge! Really huge!
2006-08-23 by Stefan Trethan
Sounds quite allright, but i couldn t get the article since it uses some strange pay per view system that works with credit card it seems. It also requires
Re: How not to control ovens - was - The list is huge! Really huge!
2006-08-23 by Philip Mac Cabe
Has anyone actually read the recent (January) Elektor article on the SMD oven? It uses a K-type thermocouple talking to a MAX6675. The program in the AT8952
Re: Tip: Repairing a HP LJ-III pickup roller.
2006-08-22 by Steve
... wrote: ... roller ... blood but ... up ... I recall the post, yes it was oil of wintergreen. I ve used brake fluid as rubber
Re: [Homebrew_PCBs] Tip: Repairing a HP LJ-III pickup roller.
2006-08-22 by Stefan Trethan
... Thank you! That is a good Tip for me, i recently bought a replacement for the upper pickup roller (very cheap on ebay nobody wanted it), but this way i can
S/S FR4 .030
2006-08-22 by Ray Dinwiddie
Another vote for Bill at abcfab@yahoo.com who has a large PCB inventory on Ebay, but if you need something not on the ebay site give him an email and you will
RE : [Homebrew_PCBs] Re: How not to control ovens - was - The list is huge! Really huge!
2006-08-22 by Robert Hedan
... Same thing here. I am devouting my time to my main project for the time being. For a while I was spitting out many PCBs, but now that I ve finished the
Tip: Repairing a HP LJ-III pickup roller.
2006-08-22 by YD
I picked up an old HP LJ-III that the owner didn t care to get fixed. Understandably, since it had toner encrusted everywhere inside and giving error messages.
Re: How not to control ovens - was - The list is huge! Really huge!
2006-08-22 by lcdpublishing
... Sorry Stefan. I was hoping to be well on my way with the ink jet stuff too - perhaps even beating you to having ink jet printed boards. However, too many
Re: [Homebrew_PCBs] How not to control ovens - was - The list is huge! Really huge!
2006-08-22 by Stefan Trethan
On Tue, 22 Aug 2006 04:24:43 +0200, John Craddock ... Yes, but i would like some form of actual temperature display and only a thermocouple produces a nice
RE: [Homebrew_PCBs] How not to control ovens - was - The list is huge! Really huge!
2006-08-22 by John Craddock
Stefan, This chap just used a Glass NTC thermistor! http://www.ustr.net/smt/oven.htm HTH Regards John C
Re: How not to control ovens - was - The list is huge! Really huge!
2006-08-22 by Andrew
... Opps - sorry - you are doing your own cold junction stuff. I will just shut up now. Keep up the good work :D
Re: The list is huge! Really huge!
2006-08-22 by roycepipkins
Stefan, I have not been entirely idle! I only got my C84 a few days ago and work-life and home-life have conspired to only give me a small amount of progress
Re: [Homebrew_PCBs] How not to control ovens - was - The list is huge! Really huge!
2006-08-22 by Stefan Trethan
... Yes, yes, of course thermocouple inside the oven. But the LMxxx would be needed as a cold junction compensation, ad595 too hard to get. ST
How not to control ovens - was - The list is huge! Really huge!
2006-08-21 by Andrew
... Not going to argue about use of industrial controllers against self built stuff (I always say why buy it for 10$ when you can build it yourself for only
Re: [Homebrew_PCBs] The list is huge! Really huge!
2006-08-21 by Stefan Trethan
... Wow, it was 2000 when i checked not so long ago! Why is there so little going on with inkjet? I was kinda hoping for more results. I want to and have to
Re: Liquid Tin - Good :-) , Pulsar paper - Bad :-(
2006-08-21 by derekhawkins
... My experience with Liquid Tin boards is that the tin coating is ultra thin and it suffers from flux discoloration. The nice silvery finish is replaced by
Re: Liquid Tin - Good :-) , Pulsar paper - Bad :-(
2006-08-21 by lcdpublishing
It came with an MSDS, I read through it, but considered it to be about as safe as all the other crap in the shop - NOT! Luckily it has a pretty nasty smell so
The list is huge! Really huge!
2006-08-21 by Steve
Wow! The list grew quickly from the start. The majority of the latest burst of members mention direct inkjet resist as their reason for joining. I have no