1.5 Volt Tracking Transmitter - Page 4 - Electronic Circuits Projects Diagrams Free

yuanong · 13th March 2009, 11:43 PM

Now i get what is enamel insulation.
The coil wire i am using are already enamel insulation.
I bought those copper cable from a shop that make transformers and motor.
Thanks for the infomation=D

duffy · 14th March 2009, 12:08 AM

yuanong - wrap it around a pencil and put nail polish on it to hold it together.

audioguru · 14th March 2009, 12:23 AM

I used wire that is 1mm in diameter so it is very strong and does not need anything to hold it together.

duffy · 14th March 2009, 12:29 AM

WTF? If you do that you won't have an excuse to buy nail polish! Get with the program.

Roff · 14th March 2009, 02:19 AM

Quote:

Originally Posted by yuanong

i have already tried to solder one myself.
as in the image

But i can't get the frequency of a Fm radio frequency range.
Can someone help me and point out the mistake that i have made?
all the components i got are the same from the circuit diagram.
Thanks a lot.

This doesn't look like Veroboard. Is it?

audioguru · 14th March 2009, 02:34 AM

The picture is too blurry to see what is there.

yuanong · 14th March 2009, 06:27 AM

Quote:

Originally Posted by duffy

yuanong - wrap it around a pencil and put nail polish on it to hold it together.

Thanks for the advice. I need it.

Quote:

Originally Posted by Roff

This doesn't look like Veroboard. Is it?

Quote:

Originally Posted by audioguru

The picture is too blurry to see what is there.

It is a veroboard.

Sorry for the blurry 1st image. Did't got a chance to get a new handphone yet.

yuanong · 14th March 2009, 03:19 PM

i can't open a new theard does anyone here mind me posting another type of circuit to ask about it?

duffy · 14th March 2009, 07:13 PM

Tell the head kiwi you can't start a thread.

1oskar · 14th March 2009, 10:38 PM

Anyway going out 88-108 MHz range not good idea, first if simple oscillator run over 108 MHz this is violation of law(in USA violation FCC rules)
108-135 MHz are airplane frequency , 121.5 MHz are homing distress frequency.
So if somebody live near airport and make a "trip out frequency" unexpected visit from governments are nothing new. Be sure that oscillator not running too long time.(If you not sure exact frequency)

yuanong · 16th March 2009, 12:46 PM

hi, i have follow all of the steps that is mention above but the frequency i got from an oscilloscope indicating the frequency is not stable.
Is it the frequency i get from the oscilopscope is incorrect or
Is there anyway to make the frequency stable or have i done any mistake that make the frequency not stable?

**Nigel Goodwin** · 16th March 2009, 01:40 PM

You can't measure it with a scope, and your layout (although far too blurred to see much detail) looks unlikely to work.

yuanong · 16th March 2009, 03:56 PM

May i know what can measure the frequency that it produce?
here is a image that i have redo.
Can please pin point out the mistake that i have made?
is the coil still to far apart?

Thanks

Roff · 16th March 2009, 04:10 PM

Quote:

Originally Posted by audioguru

The instructions say to make the coil "close wound". The turns on your coil are much too far apart which causes the frequency to be too high. The wire for the coil is supposed to be insulated with enamel so that when the close turns are touching then they do not short together.

My FM transmitter has "close wound" turns.

AG, I don't understand how you build your boards. This one has no solder showing, no cut tracks, and apparently bare jumpers across tracks. How does that work? What's on the back side?

yuanong · 16th March 2009, 04:27 PM

this is whats under it. And sorry my soldering skills is reali bad
those burn parts is at 1st i can solder in the coil.
After i scarpe of the enamel then it only can
but those burn parts i did't use those places

or should i just redo the whole thing over?

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13th March 2009, 11:43 PM	#46
yuanong	Now i get what is enamel insulation. The coil wire i am using are already enamel insulation. I bought those copper cable from a shop that make transformers and motor. Thanks for the infomation=D

14th March 2009, 12:08 AM	#47
duffy	yuanong - wrap it around a pencil and put nail polish on it to hold it together.

14th March 2009, 12:23 AM	#48
audioguru	I used wire that is 1mm in diameter so it is very strong and does not need anything to hold it together. __________________ Uncle $crooge

14th March 2009, 12:29 AM	#49
duffy	WTF? If you do that you won't have an excuse to buy nail polish! Get with the program.

14th March 2009, 02:34 AM	#51
audioguru	The picture is too blurry to see what is there. __________________ Uncle $crooge

14th March 2009, 03:19 PM	#53
yuanong	i can't open a new theard does anyone here mind me posting another type of circuit to ask about it?

14th March 2009, 07:13 PM	#54
duffy	Tell the head kiwi you can't start a thread.

14th March 2009, 10:38 PM	#55
1oskar	Anyway going out 88-108 MHz range not good idea, first if simple oscillator run over 108 MHz this is violation of law(in USA violation FCC rules) 108-135 MHz are airplane frequency , 121.5 MHz are homing distress frequency. So if somebody live near airport and make a "trip out frequency" unexpected visit from governments are nothing new. Be sure that oscillator not running too long time.(If you not sure exact frequency)

16th March 2009, 12:46 PM	#56
yuanong	hi, i have follow all of the steps that is mention above but the frequency i got from an oscilloscope indicating the frequency is not stable. Is it the frequency i get from the oscilopscope is incorrect or Is there anyway to make the frequency stable or have i done any mistake that make the frequency not stable?

16th March 2009, 01:40 PM	#57
Nigel Goodwin	You can't measure it with a scope, and your layout (although far too blurred to see much detail) looks unlikely to work. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

16th March 2009, 03:56 PM	#58
yuanong	May i know what can measure the frequency that it produce? here is a image that i have redo. Can please pin point out the mistake that i have made? is the coil still to far apart? Thanks

16th March 2009, 04:27 PM	#60
yuanong	this is whats under it. And sorry my soldering skills is reali bad those burn parts is at 1st i can solder in the coil. After i scarpe of the enamel then it only can but those burn parts i did't use those places or should i just redo the whole thing over?