1994 K40 License Plate Frame Teardown

bslaws

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#1
Just for the heck of it. Pretty crappy assembly, just some clear silicone on the wires leading in to the box and around the lid. Lid is a snap fit. Appears to have had some water intrusion.
20161227_101102.jpg 20161227_101110.jpg 20161227_101203.jpg 20161227_101249.jpg 20161227_101302.jpg 20161227_101420.jpg 20161227_101443.jpg
 

BaileyAB

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Awesome. Thanx.
 

upstatedoc

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#3
fire it up!
 

DevinR

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#4
Wow! Thanks for sharing

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Solidjake

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Nice! Thanks
 

mikedotd

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#7
Are Q1 and Q2 the receivers?
 

System

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kpatz

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#9
Q1 and Q2 are driver transistors, that control the jamming LEDs.

The capacitors are most likely power supply filtering/decoupling capacitors.

The LM2940T is a voltage regulator.

The 74HC02 IC is a quad 2-input NOR gate. Not a microcontroller as I would have expected. This thing is simple indeed. I bet it doesn't even detect incoming LIDAR, it just puts out pulses continuously (the NOR gate chip being used as an oscillator).

Are there any markings on the gray box next to the IC? I'm guessing that's a capacitor used for the oscillator.

Hook it up to a power supply and see if it does anything. Use a cell phone camera or a RD's lidar sensor to see if it puts out pulses constantly.

There's 4 wires going to it. One would be power and one would be ground, what are the other 2 for? An indicator LED for the dash or a switch or something?

I doubt it could jam a TV remote, much less a LIDAR gun.
 
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ShadowSe7en

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It looks like the car wash won the fight.
 

bslaws

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Q1 and Q2 are driver transistors, that control the jamming LEDs.

The capacitors are most likely power supply filtering/decoupling capacitors.

The LM2940T is a voltage regulator.

The 74HC02 IC is a quad 2-input NOR gate. Not a microcontroller as I would have expected. This thing is simple indeed. I bet it doesn't even detect incoming LIDAR, it just puts out pulses continuously (the NOR gate chip being used as an oscillator).

Are there any markings on the gray box next to the IC? I'm guessing that's a capacitor used for the oscillator.

Hook it up to a power supply and see if it does anything. Use a cell phone camera or a RD's lidar sensor to see if it puts out pulses constantly.

There's 4 wires going to it. One would be power and one would be ground, what are the other 2 for? An indicator LED for the dash or a switch or something?

I doubt it could jam a TV remote, much less a LIDAR gun.
[video]https://youtu.be/g-xtMJBxzpU[/video]

The smaller capacitor has a leg broken. When I hook up either set of wires, the LED's light. I have also hooked them up together with the same result.

DSC_0462.JPG DSC_0463.JPG DSC_0464.JPG
 
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kpatz

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#12
Ok, the gray box is marked X1 on the PCB so it's probably a crystal for the oscillator, possibly 8 MHz. This is a brute force jammer. :)

Based on the video only 4 of the 8 LEDs are working. Unless 4 are sensors but I doubt it with the circuit being so simple. Could be one of the transistors is bad or a connection to one of them is bad. Each transistor probably drives 4 of the LEDs.

Looks like there's 2 sets of power leads, either set can be used.

Oh, and one component I didn't mention previously: the black thing with the silver stripe (marked D1 on the board) is a diode, which is there to prevent damage if the power leads are reversed.

It's sloppily built too. They didn't clean the flux off the solder joints after soldering the parts in. Looks like there's some sort of moisture resistant coating on the back side of the board as well, unless that's also flux residue.
 
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Won Hunglo

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Never could get one to jam a PL3 back in the day. I had a local truck shop selling them and I could never talk him into testing their demo car with my PL3. They finally admitted that they did not work just to shut me up.

I actually still have one in a box somewhere I got as a gift when I loaned a jammer competitor a lidar for testing. The K40 did not work so they gave it to me for R&D as a thank you. I had planned on incorporating blinder heads into it but never got around to it.
 

ncoffi

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System

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Do you have any equiptment to test it firing? Even better, jamming? I wanna see the capabilities of it (all though I know they won't be great)
 

kcux

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A little OT... That K-40 stuff was state of the art back in the day. Their stuff would 'jam' just about everything :)

cartocar.png
 

bslaws

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Do you have any equiptment to test it firing? Even better, jamming? I wanna see the capabilities of it (all though I know they won't be great)
No, I don't have any way other than just hooking it up to my power supply as seen in the video.
 

Normsky

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That K40 jammer worked wonders when Ohio State Patrol got their LTI 20/20. I could JTG when they were working some side streets. I'd just around the block and return until they recognized my car. They would pan right to my plate as they were shooting me. The 1990's was a long to.e ago compared to today's stuff!
 

tmcmenam

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A little OT... That K-40 stuff was state of the art back in the day. Their stuff would 'jam' just about everything :)

View attachment 51206
K-40 causes a false alert in a K-40 LOL

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benzr

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#20
[video=youtube_share;g-xtMJBxzpU]https://youtu.be/g-xtMJBxzpU[/video]

The smaller capacitor has a leg broken. When I hook up either set of wires, the LED's light. I have also hooked them up together with the same result.

View attachment 51146 View attachment 51147 View attachment 51148

QUESTIONS and ANSWERS !!

It does detect Lidar !! It has a piezo spkr and a Led both only need a ground for ease of installation.

I left mine on the Front Tag of the weekend warrior so when I JTK on LI's the LEO's would think I was using that easily defeated Lazer Jammer and not my LI's !!

""oh he thinks he's so smart .. but I have news for that driver I am PT ing him as we speak""

Dunno if it ever helped as I was pretty quick on JTK on LI 's.

it would detect then immediately start a brute force jamming!

Mine is still hooked up and the LED is still embedded in my gauges.

So Im sure I can get someone here to shoot it. Although it is a complete waste of time.

And yes hunglo ... I too was going to put the third head F2 into it ... but I decided the distance was too far for the DRAGONs !!

benzr