week 9

Last week me and Jason, we went to Jaycar Electronics to buy electronic components for our signal jammer. And we have purchased few of the components we needed for the jammer. Below are the things we have bought from Jaycar Electronics. 

fig 1: Capacitor 

fig 2: Resistors

fig 3: Resistors

fig 4: Electronic board wires 

These are the things we bought last week and planing to start making a prototype using a breadboard next week before goes for the real jammer. That's it for the week.

See you,

Derick

Week 8 - Interim Presentation

Last Friday we have done our interim presentation. In this presentation we needed to present updates on our projects and what's going on now in our project currently.  

fig 1: Interim presentation (taken by Ikwan)

fig 2: Interim presentation (taken by Ikwan)

During the presentation we have started with radio frequencies and unfortunately Jason has forgot to give an reminder on our problem and the solution we have choose for the project. and secondly I have explained them about what is signal jammier and how signal jammier work. But it didn't go as I planed. I fail to explain properly how signal jammier block cellphones signals. Also I have showed them some different types of signal jammers. As the last part of our presentation Jason has explained them of our jammer circuit and how it's going to work. Below is the content page of our presentation.

fig 3: Content of interim presentation

 

After the presentation we have propose them of our new idea about the lights we are planing on using. Its an idea about using a bright light that reflects on pedestrians. I will bring more details about this next week. We are still researching on this. That's all for this week. Please comment below if you think I missed anything. 

See you all next week,

Derick.  

Week 7: RF Amplifiers

We have done some researches on RF amplifiers and found out some different amplifiers. Also found what are the purpose of them. There are few different amplifiers in the market using for different purpose. Some of them are RF amplifiers, audio power amplifiers, and microwave amplifiers.

Fig 1: RF amplifier (aliexpress.com)

fig 2: Audio amplifier (canakit.com)

For our signal jammier we need a Radio Frequency Amplifier (RF). What RF amplifier do is converts a low power radio frequency signal into high power signal. And RF amplifier is the one that drives the antenna of the jammier. So depends on how power full our jammier need to be we have select correct amplifier.

And the stereo pre amplifier we found last week from Jaycar electronics can't use for the jammier because that is use as a electronic amplifier that converts weak electronic signal strong enough to receive by main audio amplifier for further processing (wikipedia.com).  

We are planing on order an RF amplifier online because we couldn't find any from Jaycar Electronics. Hope to get it as soon as possible.

That's all for the week. We are getting ready for our interim presentation  next week. Come back next week with a summary of the presentation.

See you all next week,
Derick

Week 6- Checking components and prices for the jammier

Last Friday me and my partner Jason we have visited Jaycar  Electronics for check the electrical parts and prices we need for the jammier circuit. Below is the final diagram we are following to make the circuit. And we have check things we need for the circuit.

Fig 1: Jammier circuit diagram

  

These are the list of things and prices we have check from the Jaycar Electronics,

• Metal box (for the jammier) - 44NZD
• 1u capacitor- 2.80NZD
• C1 15pt capacitor- 1 NZD
• C2 4.7pt capacitor- 1 NZD
• C3 4.7pt capacitor - 1 NZD
• C7 10pt capacitor - 1 NZD
• C4 102pt capacitor - 1 NZD
• Q1 BF494 transistors - 1 NZD 
• R1 39k resistor - 0.70 NZD
• R2 100k resistor - 0.70NZD
• Inductor 22mH  

We also check amplifier for our jammier and we found few different amplifiers. But not sure which one we need for the jammier. so need to do some researches on amplifiers and is there any different between amplifiers we found. 

fig 2: Stereo amplifier (taken by Jason)

  

Also we have check some price rangers of LED flexible strip lights. We just check the prices only. we haven't discuss anything about lights yet. Our first target is to finish our jammier and then goes to lights. 

fig 3: different LED strip lights (Taken by Derick)

fig 4: Jason checking on components need for the circuit (taken by Derick)

fig 5: me checking on amplifiers (Taken by Jason)

That's it for this week. Next week we need to find out about amplifiers and differences of them. 

See you until next week,

Derick. 

Week 5 Continue making Signal jammier

Before we start making the signal jammier we need to find out what frequency cellphones are operating. so according to that frequency we can adjust our device to the same frequency cellphone are using. Below are the standard frequency's cellphones are using.

• AMPS - 800MHz
• PCS - 800MHz, 1800MHz, 1900MHz
• GSM - 850MHz and 1900MHz in America , 900MHz and 1800MHz in Europe and Asia
• GPS - 1227MHz in military and 1575MHZ in civil
• Wi-Fi/Bluetooth - 2400MHz to 2500MHz
• RFID (UHF/VHF) - 14MHz-1400MHz, 800MHz-2450MHz 

According to the frequency we are blocking we need to choose which frequency we are going to jam. Most text walkers are using GSM when they are distracted from phones. So blocking only that frequency would be enough. 

And another important part is FR amplification unit in our jammier. Because it decide what is the area we covered from the jammier. we need to consider more on this Because we don't need to disturb other people around that area. 

Fig 1: FR amplification Unit (White, 2011)

  

That's all for the week. And we are planing on check the prices for these electronics we need to make the signal jammier coming week. 

Catch you all next week,

Derick