Magic: The Mini-magic Switchboard should I make it a kit? - Page 4 - Electronic Circuits Projects Diagrams Free

wmmullaney · 19th January 2008, 09:32 PM

I'm going to use leds.

(Eliminating transistors)

Marks256 · 19th January 2008, 09:56 PM

Sodium Floodlights would be cool, too...

blueroomelectronics · 19th January 2008, 09:56 PM

I agree with Hero999, LEDs look too high tech, you want this thing to look simple, plus you'll have to have sockets for whatever you use. One version of the trick uses an Edison logo to make it look like its from the 1900s
I'll draw the schematic and post it here, maybe even on the projects page of my site.
Its almost too simple for a custom PCB but I'll see if I can draw it on a vero-board like Nigel uses in his tutorials. After all the only parts on the PCB would be the PIC, a cap or two, the diode, transistors and a few resistors (yea I'll use a mclr pullup so you can reprogram the thing with maybe even better tricks) all the other parts would be offboard. Batteries, switches & lamps.
Based on how popular this thread appears to be I guess we all still enjoy a magic trick.
Ps wooden box is also a good idea, the more last century it looks the better. You can buy small simple boxes at may dollar stores... (Use the sliding lid on the bottom for the batteries eh)

Marks256 · 19th January 2008, 10:10 PM

I think i am going to give this a go with my BASIC Stamp (since i can't do assembly yet...) I like this.

I just watched it again, and it makes sense now.

**3v0** · 20th January 2008, 12:22 AM

I would be happy to do a SS PCB and post the Eagle files and a foil pattern.

blueroomelectronics · 20th January 2008, 12:50 AM

I'm not at the office so I'll have to just describe the design as I see it.

16F628A
PORTB 4-7 switches (common ground)
PORTA 0-3 470ohm to 2N2222A base
all base belong to us, err gnd
4xAA to + to lamps and the 1N4148 (drops the batteries 6V VDD to 5.3V for the PIC
Emitters to lamps
Add a couple of decoupling caps and you're done.

bananasiong · 20th January 2008, 02:03 AM

I was thinking of using LEDs as well, but wait, what to hold them like the bulb? Furthermore LED is polarized, maybe this can be use as another trick?

Marks256 · 20th January 2008, 02:52 AM

make a polarized jumper. like a 4 pin stand off with one pin missing. that way it can be plugged in only one way.

blueroomelectronics · 20th January 2008, 03:09 AM

Or you could drive the LED with two I/O pins and alternate the I/O so it would light either way.

Hero999 · 20th January 2008, 09:46 AM

If you must use LEDs you can get them in standard bulb fittings but they don't really look like bulbs.

The only trouble is that if you use LEDs it'll make people more suspisous that they're bugged.

I like the idea of building the mains version, that way you could demonstrate that it will work with any standard bulb, even energy savers.

Quote:

Originally Posted by blueroomelectronics

Emitters to lamps

I'd put the collectors to the lamps and the emitters to 0V as less power will be dissipated in the transistors and the bulbs will be brighter (lower volt drop).

bananasiong · 20th January 2008, 10:08 AM

Yes, higher Vce drop if the load is at the emitter.

**3v0** · 20th January 2008, 03:36 PM

I did not hear from anyone regarding a PCB. I will hold off on bulding mine in favor of getting other projects done.

wmmullaney · 20th January 2008, 03:50 PM

I'd like to see it 3v0.

**3v0** · 20th January 2008, 03:54 PM

Quote:

Originally Posted by wmmullaney

I'd like to see it 3v0.

Do you want to use LEDs or 5V lamps ?

For LEDs I have a nice little 16F88 board layout that will work as is.

It would only take a few minutes for me to add transistors to drive lamps.

EDIT:
I am cleaning/rearranging my office/workshop/lab and any excuse is welcome!

blueroomelectronics · 20th January 2008, 03:59 PM

I've got to check my junkbox for 6V bulbs. Finally something old that Radio Shack probably stocks. Bulbs & Sockets.

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19th January 2008, 09:32 PM	(permalink)
wmmullaney	I'm going to use leds. (Eliminating transistors) __________________ 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/ Last edited by wmmullaney; 20th January 2008 at 12:09 AM.

19th January 2008, 09:56 PM	(permalink)
Marks256	Sodium Floodlights would be cool, too... __________________ There is no "I" in "team", unless Apple makes it... Then it would be iTeam.

19th January 2008, 09:56 PM	(permalink)
blueroomelectronics	I agree with Hero999, LEDs look too high tech, you want this thing to look simple, plus you'll have to have sockets for whatever you use. One version of the trick uses an Edison logo to make it look like its from the 1900s I'll draw the schematic and post it here, maybe even on the projects page of my site. Its almost too simple for a custom PCB but I'll see if I can draw it on a vero-board like Nigel uses in his tutorials. After all the only parts on the PCB would be the PIC, a cap or two, the diode, transistors and a few resistors (yea I'll use a mclr pullup so you can reprogram the thing with maybe even better tricks) all the other parts would be offboard. Batteries, switches & lamps. Based on how popular this thread appears to be I guess we all still enjoy a magic trick. Ps wooden box is also a good idea, the more last century it looks the better. You can buy small simple boxes at may dollar stores... (Use the sliding lid on the bottom for the batteries eh) __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

19th January 2008, 10:10 PM	(permalink)
Marks256	I think i am going to give this a go with my BASIC Stamp (since i can't do assembly yet...) I like this. I just watched it again, and it makes sense now. __________________ There is no "I" in "team", unless Apple makes it... Then it would be iTeam.

20th January 2008, 12:22 AM	(permalink)
3v0	I would be happy to do a SS PCB and post the Eagle files and a foil pattern.

20th January 2008, 12:50 AM	(permalink)
blueroomelectronics	I'm not at the office so I'll have to just describe the design as I see it. 16F628A PORTB 4-7 switches (common ground) PORTA 0-3 470ohm to 2N2222A base all base belong to us, err gnd 4xAA to + to lamps and the 1N4148 (drops the batteries 6V VDD to 5.3V for the PIC Emitters to lamps Add a couple of decoupling caps and you're done. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

20th January 2008, 02:03 AM	(permalink)
bananasiong	I was thinking of using LEDs as well, but wait, what to hold them like the bulb? Furthermore LED is polarized, maybe this can be use as another trick? __________________ Superman returns..

20th January 2008, 02:52 AM	(permalink)
Marks256	make a polarized jumper. like a 4 pin stand off with one pin missing. that way it can be plugged in only one way. __________________ There is no "I" in "team", unless Apple makes it... Then it would be iTeam.

20th January 2008, 03:09 AM	(permalink)
blueroomelectronics	Or you could drive the LED with two I/O pins and alternate the I/O so it would light either way. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

20th January 2008, 10:08 AM	(permalink)
bananasiong	Yes, higher Vce drop if the load is at the emitter. __________________ Superman returns..

20th January 2008, 03:36 PM	(permalink)
3v0	I did not hear from anyone regarding a PCB. I will hold off on bulding mine in favor of getting other projects done.

20th January 2008, 03:50 PM	(permalink)
wmmullaney	I'd like to see it 3v0. __________________ 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/

20th January 2008, 03:59 PM	(permalink)
blueroomelectronics	I've got to check my junkbox for 6V bulbs. Finally something old that Radio Shack probably stocks. Bulbs & Sockets. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com