transmitter & receiver circuit problrm

Off-topic Or Otherwise...Say/Ask It Here
tefaelgn
Newbie Pyro
Posts: 9
Joined: Fri Apr 04, 2014 10:04 pm

transmitter & receiver circuit problrm

Postby tefaelgn » Fri Apr 04, 2014 10:21 pm

Hello , iam serious to build this circuit and i do that exactely , but it's not work :(

i used torid core with 5 turns of magnetic wire has cross section area of 0.5mm .. and replace the 1uH to 5uH ( i can not catch the 1uH so replace it ) and i used 2M ohm insted of 2.2M ohm ... and timer NE555 insted of 7555 .... and i used coaxeal cable for antenna ..

is this replacement make the circuit to do not work ??

sorry for Prolongation .

i will be on with you until the circuit working with me :) :) :D

thx.

ThePyroElectro
PyroElectro Admin
Posts: 1181
Joined: Mon Nov 12, 2007 9:24 pm
Location: Earth
Contact:

Re: transmitter & receiver circuit problrm

Postby ThePyroElectro » Fri Apr 04, 2014 11:18 pm

tefaelgn wrote:Hello , iam serious to build this circuit and i do that exactely , but it's not work :(

i used torid core with 5 turns of magnetic wire has cross section area of 0.5mm .. and replace the 1uH to 5uH ( i can not catch the 1uH so replace it ) and i used 2M ohm insted of 2.2M ohm ... and timer NE555 insted of 7555 .... and i used coaxeal cable for antenna ..

is this replacement make the circuit to do not work ??

sorry for Prolongation .

i will be on with you until the circuit working with me :) :) :D

thx.


Hello,

Those changes should be ok.

The easiest way to trouble-shoot the circuit is to use a spectrum analyzer to make sure your transmitter is transmitting at the correct frequency and that it has decent power output.

When you know for sure that is working, you can use an oscilloscope or spectrum analyzer after the tuning circuit and front end on the receiver to see if the signal is getting through.

Please see my project write-up to see how the signal should look at those different points.

I will bet that your RF coil + capacitor are not tuning for the correct frequency.

tefaelgn
Newbie Pyro
Posts: 9
Joined: Fri Apr 04, 2014 10:04 pm

Re: transmitter & receiver circuit problrm

Postby tefaelgn » Sat Apr 05, 2014 5:02 pm

thx for fast answer

i already test it on the simulation program . almost all point that you shown in the explaination for test on oscilloscope appear the same waveform like in your pictures , ONLY one point dosen't operate well , this point is the first point for the crystal , in my simulation the crystal not oscillator and i don't know why!!!

i forgot to tell you that i use crystal 27MHz only and not 27.145MHz like yours .

i will try again and tell you the new results .

thx.

tefaelgn
Newbie Pyro
Posts: 9
Joined: Fri Apr 04, 2014 10:04 pm

Re: transmitter & receiver circuit problrm

Postby tefaelgn » Sat Apr 05, 2014 9:03 pm

this is receiver circuit:
receiver.JPG
receiver.JPG (71.92 KiB) Viewed 9884 times


and this is transmitter circuit:
Attachments
transmitter.JPG
transmitter.JPG (80.18 KiB) Viewed 9884 times

tefaelgn
Newbie Pyro
Posts: 9
Joined: Fri Apr 04, 2014 10:04 pm

Re: transmitter & receiver circuit problrm

Postby tefaelgn » Sat Apr 05, 2014 9:09 pm

power supply for 5v and 9v
power.JPG
and this is power supply for 5v and 9v
power.JPG (34.6 KiB) Viewed 9884 times


and this is the coaxial cable that i used.
coaxeal cable.JPG
and this is the coaxial cable that i used.
coaxeal cable.JPG (91.3 KiB) Viewed 9884 times

ThePyroElectro
PyroElectro Admin
Posts: 1181
Joined: Mon Nov 12, 2007 9:24 pm
Location: Earth
Contact:

Re: transmitter & receiver circuit problrm

Postby ThePyroElectro » Sun Apr 06, 2014 10:26 pm

Hi Tefaelgn,

I don't expect that this circuit will work on a breadboard, you really should build it on a PCB.

Simulating a crystal, at least in PSPICE, can be a little tricky because the models in most SPICE programs need to be 'jump-started' before they will begin to oscillate as part of the sim.

tefaelgn
Newbie Pyro
Posts: 9
Joined: Fri Apr 04, 2014 10:04 pm

Re: transmitter & receiver circuit problrm

Postby tefaelgn » Mon Apr 07, 2014 1:24 pm

OK . let's go to the layout and PCB to desgin the two circuit,,,

before that , i want to show you the components that iam soldering it .

for transmitter circuit :
circuit diagram 2 with some variation.png
circuit diagram 2 with some variation.png (48.17 KiB) Viewed 9874 times


for receiver circuit :
Attachments
circuit diagram with some variation.png
circuit diagram with some variation.png (43.37 KiB) Viewed 9874 times

tefaelgn
Newbie Pyro
Posts: 9
Joined: Fri Apr 04, 2014 10:04 pm

Re: transmitter & receiver circuit problrm

Postby tefaelgn » Mon Apr 07, 2014 1:32 pm

ah .. one question for antenna >>>

i can use any wire for it or i should use a specific one ?? i can use the wire of utb cables ?

tefaelgn
Newbie Pyro
Posts: 9
Joined: Fri Apr 04, 2014 10:04 pm

Re: transmitter & receiver circuit problrm

Postby tefaelgn » Mon Apr 07, 2014 7:30 pm

iam sorry i forgot to add this altrnative to the receiver circuit .
Attachments
lalalalalal.JPG
lalalalalal.JPG (34.64 KiB) Viewed 9871 times

tefaelgn
Newbie Pyro
Posts: 9
Joined: Fri Apr 04, 2014 10:04 pm

Re: transmitter & receiver circuit problrm

Postby tefaelgn » Tue Apr 22, 2014 10:46 pm

sorry for the delay.

this is my layout for transmitter circuit
Attachments
Capture.JPG
Capture.JPG (127.99 KiB) Viewed 9839 times

tefaelgn
Newbie Pyro
Posts: 9
Joined: Fri Apr 04, 2014 10:04 pm

Re: transmitter & receiver circuit problrm

Postby tefaelgn » Wed Aug 27, 2014 11:24 pm

hello
i back again :)
i built the PCB for the two citcuit (Tx and Rx)... i can recive the signal but it is very weak ... and looklike a flasher ... when i press the putton in the Tx circuit, the green LED don't emit > but when leave the button the green led emit little light and close .

maybe the amplifier in Rx circuit have a problem??
i wait your advice .
thanks.

another question : your Tx circuit can run with any Rx circuit or must use your Rx circuit ?


Return to “Put'm Here”

Who is online

Users browsing this forum: No registered users and 0 guests