Magic: The Mini-magic Switchboard should I make it a kit? - Page 9 - Electronic Circuits Projects Diagrams Free

wmmullaney · 22nd January 2008, 05:10 PM

Oops, missed it thanks so much.

Pommie · 22nd January 2008, 05:16 PM

You may need a power switch anyway as you will need the WPUs for the switches. These are around 20k and so can draw a significant current. I guess a simple way around that would be to use 200k pullup/downs on the switches/bulbs.

Mike.

blueroomelectronics · 22nd January 2008, 05:20 PM

Well the pullups only matter if the switches are on.

Good point though, I'll have to remember to make 1=off

blueroomelectronics · 22nd January 2008, 06:57 PM

Dumb question, should I add clamp diodes for the small bulbs? (6.3V 200ma) driven by a 2N2222 transistor.

Leftyretro · 22nd January 2008, 07:19 PM

Quote:

Originally Posted by blueroomelectronics

Dumb question, should I add clamp diodes for the small bulbs? (6.3V 200ma) driven by a 2N2222 transistor.

I wouldn't think so as the lamps should not have much inductance.

Lefty

wmmullaney · 22nd January 2008, 07:46 PM

Probably not, but since I have so many diodes I might.

**Nigel Goodwin** · 22nd January 2008, 08:22 PM

Quote:

Originally Posted by wmmullaney

Probably not, but since I have so many diodes I might.

No need whatsover, there's no inductance worth mentioning, and it's NEVER done for small bulbs like these.

wmmullaney · 22nd January 2008, 08:42 PM

Alright then, I won't.

**3v0** · 22nd January 2008, 11:54 PM

Quote:

Originally Posted by Pommie

Being able to sense if a bulb has been absent is so that you know when a new sequence needs to be inputed. This I believe is a better way than using a timer and probably how the original worked. The only time no bulbs are removed is right at the end of the video and just prior to that the magician does a particular sequence which I assume resets the program (from memory I think it is simply right to left).

Mike.

The timer allows you to reorder the switches without changing any bulbs.
I am adding the sense resistors regardless. It can be built either way.

wmmullaney · 23rd January 2008, 12:02 AM

So, Bill, are you going to make it a kit? When done how many $$$ will it be?

**3v0** · 23rd January 2008, 02:04 AM

This is an updated version that includes bulb current sensing. It can be built with bulbs or LEDs. To use bulbs short the 4 SMD jumpers. To use with LEDs install 4 current limiting resistors R10-R13 over the top of the SMD jumpers.

To use bulb sensing install R4-7 and the 4 jumpers shown in RED on the top side of the board.

Install the MCLR jumper that snakes around the chip to the ICSP connector. The route shown here is not a good one. This jumper will not exist in the next rev in that there is a possible route.

EDIT: There are a few things here that are a bit odd. Mostly due to the now quite ready for prime time beta version of Eagle that I am using. But I do not see anything that should keep it from working.

EDIT2: Schematic unchanged. Removed the MCLR jumper and routed it on bottom layer. Decreased Isolate to .032.

EDIT3: Schematic unchanged. Very small change to layout. I am removing the .png for the foil and replacing it with a PFF which is much clearer. There is also text file which is actually a GCODE file to drill the PCB on a CNC machine. You must rename this file to work with you CNC software, maybe .nc or .t
EDIT 4: Schematic unchanged. Board to ver 1C2. Moved processor to make more room for switch connector. Replaced foil.pdf with foil_1C2.pdf.

bananasiong · 23rd January 2008, 02:50 AM

CopyLeft3007 3v0

Can I know how do you add the ground traces on the empty space?

Thanks

**3v0** · 23rd January 2008, 03:26 AM

POLYGON GND

If you ground is called GND
The distance between the GND fill and other signals is set by ISOLATE.

bananasiong · 23rd January 2008, 03:36 AM

Is this setting done in the schematic before converting it into layout?
I always start directly from the layout and route manually. That's why it takes me very long time for designing the PCB.

**3v0** · 23rd January 2008, 03:58 AM

Quote:

Originally Posted by bananasiong

Is this setting done in the schematic before converting it into layout?
I always start directly from the layout and route manually. That's why it takes me very long time for designing the PCB.

If you start by entering the schematic it will save time. The schematic editor can check the schematic for errors too. If you create a board from a schematic the tool will keep track of where every connection should go and you how many are left.

In the board editor there is a command line box just above the main work area. It is here that you type POLYGON GND. But if you did not create the board from a schematic it can not know which traces belong to GND or any other signal.

Take the time to learn the schemaic editor. It is worth the effort. Help is here if you need it or also on Eagle's email list.

I changed the board to get rid of the MCLR jumper. You may want to look at it.

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22nd January 2008, 05:10 PM	(permalink)
wmmullaney	Oops, missed it thanks so much. __________________ Regards, William Mullaney "HOPE for the best, EXPECT the worst, ACCEPT whatever comes." http://wiliamsville.myminicity.com/ http://wiliamsville.myminicity.com/ind/ http://wiliamsville.myminicity.com/tra/ http://wiliamsville.myminicity.com/sec/

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Pommie	You may need a power switch anyway as you will need the WPUs for the switches. These are around 20k and so can draw a significant current. I guess a simple way around that would be to use 200k pullup/downs on the switches/bulbs. Mike.

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blueroomelectronics	Well the pullups only matter if the switches are on. Good point though, I'll have to remember to make 1=off __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

22nd January 2008, 06:57 PM	(permalink)
blueroomelectronics	Dumb question, should I add clamp diodes for the small bulbs? (6.3V 200ma) driven by a 2N2222 transistor. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

22nd January 2008, 07:46 PM	(permalink)
wmmullaney	Probably not, but since I have so many diodes I might. __________________ Regards, William Mullaney "HOPE for the best, EXPECT the worst, ACCEPT whatever comes." http://wiliamsville.myminicity.com/ http://wiliamsville.myminicity.com/ind/ http://wiliamsville.myminicity.com/tra/ http://wiliamsville.myminicity.com/sec/

22nd January 2008, 08:42 PM	(permalink)
wmmullaney	Alright then, I won't. __________________ Regards, William Mullaney "HOPE for the best, EXPECT the worst, ACCEPT whatever comes." http://wiliamsville.myminicity.com/ http://wiliamsville.myminicity.com/ind/ http://wiliamsville.myminicity.com/tra/ http://wiliamsville.myminicity.com/sec/

23rd January 2008, 12:02 AM	(permalink)
wmmullaney	So, Bill, are you going to make it a kit? When done how many $$$ will it be? __________________ Regards, William Mullaney "HOPE for the best, EXPECT the worst, ACCEPT whatever comes." http://wiliamsville.myminicity.com/ http://wiliamsville.myminicity.com/ind/ http://wiliamsville.myminicity.com/tra/ http://wiliamsville.myminicity.com/sec/

23rd January 2008, 02:50 AM	(permalink)
bananasiong	CopyLeft3007 3v0 Can I know how do you add the ground traces on the empty space? Thanks __________________ Superman returns..

23rd January 2008, 03:26 AM	(permalink)
3v0	POLYGON GND If you ground is called GND The distance between the GND fill and other signals is set by ISOLATE. __________________ search engine for electronic parts Junebug USB PIC programmer kit., USB Bit Wacker, 3v0's Homepage The 15 Minute Printed Circuit Board! (+drill time)

23rd January 2008, 03:36 AM	(permalink)
bananasiong	Is this setting done in the schematic before converting it into layout? I always start directly from the layout and route manually. That's why it takes me very long time for designing the PCB. __________________ Superman returns..