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301  Topics / Product Design / Re: 8 Channel Relay Board - Proofreading on: April 14, 2013, 08:48:43 pm
So, for example R16 (T16) needs to be pulled high?

The circuit is pretty hard to see for me and I think there is a mistake in it anyway. It looks like the wire shorting out the relay coil shouldn't be there. Notice where the collector of the phototransistor goes and notice that the emitter is not grounded.

Edited: Sorry, that was poorly worded. I meant notice how the collector on the ebay circuit is wired to 5 V and their emitter goes to the base of the driver transistor as opposed to the way your circuit is wired.

Ah, I understand now.  I attached a schematic of which I was basing mine off of.

Now my first sentence on this post would rectify the situation, pulling (T16 for example) high?  Since you can't see (lol), the wire going from the collector to the base of the relay transistor.
302  Topics / Product Design / Re: 8 Channel Relay Board - Proofreading on: April 14, 2013, 08:24:30 pm
According to the datasheets:

4N37S has 100mA collector current
The relay needs 150mA
303  Topics / Product Design / Re: 8 Channel Relay Board - Proofreading on: April 14, 2013, 08:18:07 pm
Sorry, but I don't see any difference in the Ebay ckt to mine.  The only thing that I see is that I have a LED and a resistor for the LED on the relay.

Also I don't see (nor have I ever seen) pull-up resisitors on the Inputs.

Not trying negative but I would like to understand.

I attached the opto I am using.
304  Topics / Product Design / Re: 8 Channel Relay Board - Proofreading on: April 14, 2013, 08:04:44 pm
Hmmm.  Ok CrossRoads you lost me at Tx..  I feel retarded but what Tx are you talking about?
305  Using Arduino / General Electronics / Re: Could someone please help me generate Gerbers from Eagle? on: April 14, 2013, 07:08:15 pm
Have ordered from OSH park instead, looks and sounds promising smiley I have noticed an error by me already, there appears to be silk screen on the resistor pads whoops. I uploaded the .brd file instead of messing around with the gerbers - I wonder if that is why it happened?

Nope, it was on your screen as well.  Cause it was on mine.  You can email him at pcb@laen.org and let him know that you have to make changes.  email the new .brd file and he will change it for you.  He's a good guy.
306  Topics / Product Design / Re: 8 Channel Relay Board - Proofreading on: April 14, 2013, 07:03:54 pm
Curious, what is pin 6 on the opto used for?  Should I leave it floating?
307  Topics / Product Design / Re: 8 Channel Relay Board - Proofreading on: April 14, 2013, 04:31:43 pm
I hadn't thought about everyone having the same size screen as I.

Original post modified with updated schematic.
308  Topics / Product Design / Re: 8 Channel Relay Board - Proofreading on: April 14, 2013, 02:33:29 pm
Design looks ok. Use a picture hosting side without so much spam. Or just attach the pictures to your post:
Click "Additional Options", browse to your attachment.

I apologize CrossRoads.  I have been using postimg for years now and never had any spam on my screen.  Of course, I use FireFox with around 5 anti-spam/pop-up/ads extensions.  I am one person that hates ads and pop-ups.  I turned off the blockers and reloaded the page and didn't see anything.  But, I am sorry.

I don't like use the attachment feature when I need to upload large pics as I hate to scroll all over it to see it.

Also, thanks for the extra set of eyes. +1

I guess I'm blind today.

Looking at what?
309  Topics / Product Design / 8 Channel Relay Board - Proofreading on: April 14, 2013, 12:57:11 pm
I have drawn up an 8 channel relay board from a couple of different schematics and wanted another set of eyes to proofread it for me.  It is an opto-isolated system that will be controlling 24V max.  

I have never used a relay with an Arduino and I would rather design my own ckt than to just buy one.  As I am aware, this should be an active-low layout.  Are my assumptions correct?
The IN1-IN8 are the Arduino inputs and +5V will come from a Power supply.  VCC will come from Arduino's supply.

Any advice or constructive criticism is welcome.
310  Community / Bar Sport / Re: How do you bend a circuit board into a 1cm diameter cylinder? on: April 14, 2013, 10:25:57 am
Itead now sells customizable FCBs, http://imall.iteadstudio.com/open-pcb/pcb-prototyping.html
311  Community / Bar Sport / Re: How do you bend a circuit board into a 1cm diameter cylinder? on: April 13, 2013, 10:57:26 pm
I wonder if I can run my servos off them.  A pen that gets up and runs away!  That's fantastic.

And they are pricey..  I still want one though..

312  Using Arduino / Microcontrollers / Re: lcd sample program on: April 13, 2013, 10:51:41 pm
Well now, that would depend on what LCD you have, huh?

The Arduino IDE has some fine samples.
313  Using Arduino / Microcontrollers / Re: new to avr on: April 13, 2013, 10:50:28 pm
If you're new to programming, than the Arduino IDE is the way to go.
314  Using Arduino / Microcontrollers / Re: 7 segment clock using rtc ds1307 on: April 13, 2013, 10:49:05 pm
digitalWrite (http://www.google.com , HIGH);

It's digital.Write(http://www.google.com , HIGH);

You forgot the 'dot'.
LOL
 smiley-razz
315  Using Arduino / General Electronics / Re: LM 338 393?? on: April 13, 2013, 10:45:16 pm
LM393 is a Comparator - http://www.ti.com/lit/ds/symlink/lm193-n.pdf

LM338 is a Regulator - http://www.ti.com/lit/ds/symlink/lm138.pdf
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