Scary Terry sound to servo board

[tstraub]

Well I recently decided that I wanted to get into doing some stuff for Halloween in addition to My Christmas display. After researching talking skulls I found a very simple circuit for taking and audio signal and converting it to drive the jaw servo of a skull. So I went ahead and put together a home etched version of that circuit. The circuit is very inexpensive to build and works very well.

Here is a link to the original circuit http://www.scary-terry.com/audioservo/audioservo.htm

and here is a video of it in action https://vimeo.com/38889756

If anyone is interested in the etch files I should have them ready in a few weeks. The prototype that I have built works good but the board file needs some adjustments to make it a little easier to build.

I would also like to thank Halstaff for providing me with the audio file and answering all of my noob questions about Halloween props.

Tyler

[dirknerkle]

Nice job, Tyler! Very, very effective, and responsive. Not having to program every move makes it more dynamic -- hook up a microphone and go for it!

Well done, my friend! I'll be looking for those home-etch layouts!!!

[Greg in Canby]

Tyler,

I'm really happy with that circuit and have used it 4 or 5 seasons now!

Thank you for putting together a home etch option . . . You rock!

[hollandlihjtdisplay]

i have one of the scary terrys manufactured boards that you can buy on his site somewhere. I quit using it because i started trying to go computer controlled servos.

[tstraub]

Just a little update:

I believe I have a more etch friendly version of this board. The mounting holes are space to fit a TA200 enclosure. I will try to build one this weekend to test it. I think I will change the name on this project to avoid any confusion between this design and the one designed by Cowlacious. the new name will be Simple Sound to Servo.

s2s.JPG

[Mactayl]

Just a little update:

I believe I have a more etch friendly version of this board. The mounting holes are space to fit a TA200 enclosure. I will try to build one this weekend to test it. I think I will change the name on this project to avoid any confusion between this design and the one designed by Cowlacious. the new name will be Simple Sound to Servo.

s2s.JPG

Looks nice Tyler,,, and the name SIMPLE Sound to Servo sounds great...

[tstraub]

Wayne,

You state that the LED is on all the time and the servo is driving the jaw closed. This sounds odd to me while the LED is on the jaw should be driving open. that could be as simple as moving your linkage to the other side of the Servo horn. Now about the circuit always staying triggered I suspect something is wrong with the amplifier section of the circuit. I would suggest that you try removing the LM4858 audio amplifier chip and see if the light turns off. With the chip removed the LED should be off and the servo should drive to the closed position. If that checks normal with the amp chip still removed short pins 7 and 8 of the amplifier socket together. This will trigger the 4066N switch and the LED should come on and jaw will open. Try these tests and let me know your results

Tyler

Edit:
I see from your PM that you constructed this circuit on a Radio Shack PCB(good for you a real DIYer) if you could post a picture it might be helpful or at least interesting. I would be happy to look over your work and see if you missed a wire or got a wrong pin somewhere.

[tstraub]

OK new layout is built and tested. I love this little board I am still surprised at how well it works for such a simple little circuit. This layout is much better for the home etchers. I will even post a picture of the back side on this one. trust me nobody wants to see all the shorts I had to fix to get the first board going. Etch files will be added to the File Library as soon as I get the silk screen layer ironed out and a BOM put together.

2012-03-24_13-09-56_914[1].jpg 2012-03-24_13-12-24_281[1].jpg

Tyler

[tstraub]

I added the etch files to the copper section of the File Library and got a BOM together. All parts were sourced from taydaelectronics.com 1 BOM will populate 2 Simple Sound to Servo Boards. I made the BOM as a double because just one does not meet the $5 minimum order. So I guess you have to build 2. You will also have a few left over resistors due to the fact that Tayda requires minimum of 10 each value. The only part that I have not tested is the 3.5mm audio Jack. This jack was an after though and is meant to be mounted as a pass threw connector on your enclosure that way you don't need to open the enclosure to plug your audio cable in.

You will also need a few shunts. Tayda does not carry them or at least I could not find them. I just grab them out of old disc drives and motherboards.

Part							qty 	price	subtotal

220K OHM 1/4W 5% Carbon Film Resistor	 		10	$0.01	$0.10	
100nF 0.1uF 100V 5% Mylar Film Capacitor		8	$0.05	$0.40	
1K OHM 1/4W 5% Carbon Film Resistor	 		10	$0.01	$0.10	
47K OHM 1/4W 5% Carbon Film Resistor			10	$0.01	$0.10	
5K OHM Trimpot Variable Resistor 6mm	 		2	$0.06	$0.12	
1K OHM Trimpot Variable Resistor 6mm	 		2	$0.06	$0.12	
10K OHM 1/4W 5% Carbon Film Resistor	 		20	$0.01	$0.20	
1N914 Small Signal Diode 200mA 100V 			2	$0.02	$0.04	
LM1458N LM1458 1458 IC DUAL OPERATIONAL AMPLIFIER 	2	$0.49	$0.98	
10uF 25V 105C Radial Electrolytic Capacitor 5x11mm	2	$0.01	$0.02	
2.2K OHM 1/4W 5% Carbon Film Resistor			10	$0.01	$0.10	
CD4066 4066 IC CMOS QUAD BILATERAL SWITCH 		2	$0.22	$0.44	
470 OHM 1/4W 5% Carbon Film Resistor 			10	$0.01	$0.10	
4.7K 4K7 OHM 1/4W 5% Carbon Film Resistor		10	$0.01	$0.10	
22K OHM 1/4W 5% Carbon Film Resistor	 		10	$0.01	$0.10	
50K OHM Trimpot Variable Resistor 6mmE	 		4	$0.06	$0.24	
10nF 0.01uF 100V 5% Mylar Film Capacitors 		2	$0.04	$0.08	
NE555 IC 555 Timer DIP-8				2	$0.13	$0.26	
2.2uF 50V 105C Radial Electrolytic Capacitor 5x11mm	2	$0.01	$0.02	
4.7uF 16V 105C Radial Electrolytic Capacitor 5x11mm	2	$0.01	$0.02	
2N3904 NPN General Propose Transistor 			2	$0.01	$0.02	
LED 3mm Red 						4	$0.02	$0.08	
40 Pin 2.54 mm Single Row Pin Header Strip 		1	$0.15	$0.15
DG301 Screw Terminal Block 3 Positions 5mm		2	$0.15	$0.30	
DG301 Screw Terminal Block 2 Positions 5mm		2	$0.10	$0.20	
14 pin DIP IC Socket Adaptor Solder Type		2	$0.05	$0.10	
8 pin DIP IC Socket Adaptor Solder Type			4	$0.02	$0.08	
3.5mm Stereo Enclosed Socket				2	$0.22	$0.44	

Total									$5.01

[tstraub]

I started work on a Wiki page to help out the ones eager enough to give this one a try. http://doityourselfchristmas.com/wik...Sound_to_Servo

Tyler