can someone find to me servo pulser build with standard component parts?

[al000y]

hey

im new on electricity
the simple servo pulser i found is this
http://www.uoguelph.ca/~antoon/gadgets/servo3.htm
but in my country there is only three places sell Capacitors & resistors etc

and they dont have C1 = 390nf and 2k7 potiometer
they have 330nf and 2k2 potiometer

so can anybody help me and modified the project to more standard component that i can find them in my country

[Acetronics]

Hi, Aly

You here ??? I do not believe it ;) ...

390 nF = 330nF parallelled with 56nF or two times 33nF ...

For the pot ... let it like that :) !!! or simply add 470 Ohms in series ...

Alain

[jeffs555]

Can you get a 470nf capacitor? If so, you could try that circuit with R1=2k2 and R2=56k and C1=470nf and a 2k2 pot.

[al000y]

hey
Acetronics or jeffs555
can you draw to me the circiut with the new components like that
because i dont know much in electricity

http://web2.murraystate.edu/andy.batts/ps/Servo_Driver_Distribution_Pack.ppt#256,3,Slide 3

[jeffs555]

That last circuit you posted is wrong, C3 is in the wrong place. Just use the first link you posted, and use R1=2k2 and R2=56k and C1=470nf and P1=2k2 with all other parts the same.

[al000y]

just two last questions
1- the positive connect to C3 and C3 connect to ground is that mean that C3 connect to nothing?

2- the the Potentiometer have three terminals
http://sound.westhost.com/pots-f5.jpg
so i must connect pin 8 from the NE555 to first and middle terminal then connect the third one to R1?

[jeffs555]

1) C3 is used as a bypass capacitor. It should be connected between the positive and ground pins(pin8 and pin1) of the NE555. It should be as close to the IC as possible because long wires will reduce its effectiveness. Wire length is not very critical in this low speed circuit, but in higher speed circuits it becomes very important.

2)yes, that is how you would connect it.

[al000y]

more explain please about the first point

[Gary Warner]

more explain please about the first point
It's a power supply filter, used to stabilize the power supply voltages. Its use is more about its physical location to best stop small high frequency noise pulses that can 'ride' on the power line. The noise is generated from the IC more so than from distant sources.