1.5 Volt Tracking Transmitter - Page 5 - Electronic Circuits Projects Diagrams Free

**Nigel Goodwin** · 16th March 2009, 05:41 PM

As I presumed, you haven't cut the unused tracks on the board, so you have lot's of extra capacitance sending the frequency way off - assuming it will even oscillate like that.

audioguru · 16th March 2009, 05:50 PM

Quote:

Originally Posted by Roff

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?

The photo of my stripboard shows the component and jumpers side. The other side has the horizontal copper strips that I cut and all the solder joints.
The white strips on the component side is just a paint pattern of the copper strips on the other side.

yuanong · 16th March 2009, 06:00 PM

i have already cut those that is connecting. And i have already confirm with a multimeter that its not linked.

Roff · 16th March 2009, 06:26 PM

Quote:

Originally Posted by audioguru

The photo of my stripboard shows the component and jumpers side. The other side has the horizontal copper strips that I cut and all the solder joints.
The white strips on the component side is just a paint pattern of the copper strips on the other side.

Oh.

I didn't realize that was white. As you guessed, I thought I was looking at tin or solder plating.

**Nigel Goodwin** · 16th March 2009, 06:36 PM

Quote:

Originally Posted by yuanong

i have already cut those that is connecting. And i have already confirm with a multimeter that its not linked.

You need to cut, or (and) remove all unused strips as well.

1oskar · 17th March 2009, 01:21 AM

Only for digital circuits and audio frequency usually I was use such this PCB,
for high frequency only PCB or I was made or buy. RF circuits are not good on experimental PCB
The experimental PCB not good for such this, and make own PCB is really cheap and easy and more fun.

Frequency are measure using Frequencies meter.
Anny will be work good.

duffy · 17th March 2009, 03:36 AM

Yuanong, it looks like you are missing a capacitor (should be 3 on the transistor oscillator), and I don't see the emitter resistor.

yuanong · 17th March 2009, 06:07 AM

this image shows my component value compare to audioguru circuit.
Did i miss any component? If yes please tell me. Thank you

http://www.electro-tech-online.com/a...tter-again.png

duffy · 17th March 2009, 10:33 AM

Where's R1?

yuanong · 17th March 2009, 06:17 PM

R1 is block by the LED

Roff · 17th March 2009, 06:26 PM

Quote:

Originally Posted by Nigel Goodwin

You need to cut, or (and) remove all unused strips as well.

Yuanong, did you do this?

yuanong · 17th March 2009, 07:05 PM

yup, i have already done. its small now.

audioguru · 17th March 2009, 11:12 PM

You must slowly tune the transmitter with a plastic bladed screwdriver because a metal screwdriver blade will mess up the capacitance.

It does not transmit a tone, it transmits silence. You will hear the FM background noise in an FM radio go quiet each time the LED lights. The radio must not have muting.

colin55 · 11th April 2009, 04:59 AM

You are doing a wonderful job.
The first piece of test equipment you need is a "power meter." It simply detects if you have RF present.

Once you know you have RF. you can work on getting the frequency somewhere on the 88-108MHz band.

colin55 · 11th April 2009, 08:30 AM

Here is a Tracking Transmitter that uses easy-to-obtain components:

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar
Title	Starter	Forum	Replies	Latest
Attempting to make a Keyfob transmitter...	adamthole	Electronic Projects Design/Ideas/Reviews	7	25th November 2006 01:05 PM
usb soundcard with fm transmitter	Gideonstk	Electronic Projects Design/Ideas/Reviews	2	14th June 2006 02:31 PM
Viability of tracking device	Glyph	Chit-Chat	3	25th August 2005 07:33 PM
Transmitter	zachtheterrible	General Electronics Chat	3	5th August 2004 10:56 AM
Using LEDs to show the direction of a tracking transmitter	Electric Rain	Electronic Projects Design/Ideas/Reviews	1	18th June 2004 12:09 PM

16th March 2009, 05:41 PM	#61
Nigel Goodwin	As I presumed, you haven't cut the unused tracks on the board, so you have lot's of extra capacitance sending the frequency way off - assuming it will even oscillate like that. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

16th March 2009, 06:00 PM	#63
yuanong	i have already cut those that is connecting. And i have already confirm with a multimeter that its not linked.

17th March 2009, 01:21 AM	#66
1oskar	Only for digital circuits and audio frequency usually I was use such this PCB, for high frequency only PCB or I was made or buy. RF circuits are not good on experimental PCB The experimental PCB not good for such this, and make own PCB is really cheap and easy and more fun. Frequency are measure using Frequencies meter. Anny will be work good. Attached Thumbnails

17th March 2009, 03:36 AM	#67
duffy	Yuanong, it looks like you are missing a capacitor (should be 3 on the transistor oscillator), and I don't see the emitter resistor.

17th March 2009, 06:07 AM	#68
yuanong	this image shows my component value compare to audioguru circuit. Did i miss any component? If yes please tell me. Thank you http://www.electro-tech-online.com/a...tter-again.png

17th March 2009, 07:05 PM	#72
yuanong	yup, i have already done. its small now.

17th March 2009, 11:12 PM	#73
audioguru	You must slowly tune the transmitter with a plastic bladed screwdriver because a metal screwdriver blade will mess up the capacitance. It does not transmit a tone, it transmits silence. You will hear the FM background noise in an FM radio go quiet each time the LED lights. The radio must not have muting. __________________ Uncle $crooge

11th April 2009, 04:59 AM	#74
colin55	You are doing a wonderful job. The first piece of test equipment you need is a "power meter." It simply detects if you have RF present. Once you know you have RF. you can work on getting the frequency somewhere on the 88-108MHz band.

11th April 2009, 08:30 AM	#75
colin55	Here is a Tracking Transmitter that uses easy-to-obtain components: