Carlson's Super Probe

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About: Hi, i'm electronic technician but it's my hobby too. I like to do and try many projects just for fun :)

Hi everyone, recently i made the "Carlson Super Probe" and i'd like to share with you how to do this!

First of all, listen Paul's video. You will see why you should build this probe, how sensitive that is. Also if you like electronic you should see Mr Carlson patreon page here: https://www.patreon.com/MrCarlsonsLab and maybe support him.

So let's begins!

Step 1: Schematics

Here are the schematics. Those are exactly the same you saw in the Mr Carlson's lab video. Except for the amplifier. I added some diodes to lower the voltage, if you are using alkaline batteries instead rechargeable. Alkaline batterie are 1.5v. Nica or nimh are 1.2 only. The amp chip 4871 need a MAX of 5.5V. So add diode lower the voltage by 0,6v each.

Step 2: ​Doing the Probe

For the probe shell, i used copper. Go to hardware store and buy those pieces. The pipe size is 4/3 inches.

Step 3: Electronics Parts

You will need some specific part. This is the digikey part number.

The little switch:

CKN9559-ND OS102011MA1QN1

-----------------------------

Pot 100k

CT6EX104-ND CT6EX104

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capacitor 1206 22uf

478-5798-1-ND

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capacitor 4.7uf 0603

1276-1044-1-ND

----------------------------

capacitor 360pf 0603

490-1440-1-ND

----------------------------

diode

1N5711WS-FDICT-ND

----------------------------

Transistor 3904 sot23

MMBT3904LT3GOSCT-ND

----------------------------

Light bulb (optional) to put on supply vr. See Video 42:00 min

CM683-ND

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Amplifier chip

LM4871MX/NOPBCT-ND

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And for the resistor all are 0805 resistor.

Step 4: Probe PCB

To do the pcb, just print and etch the carlson probe.pdf. Refer to the component location to solder the part. You do not need to etch a double side pcb. The bottom side is ground, except for swtich, led and one pin of the pot. Refer to the probe bottom picture.

Step 5: Make Encavure

Make an encavure and solder the pcb right in the middle. Try and adjust the size of pcb to fit in the pipe.

Step 6: Install Wire

Here i'm using a mouse cable. You can use a headphone or mic cable if you like. Keep in mind that the probe will move very often. So use an appropriate cable.

Step 7: Put the Probe in a Shell

For now i used black tape. But i'l probably put a little machine screw or a bit of solder.

Step 8: Probe Amplifier.

The pcb is single side. No jumper at all.

Step 9: Amplifier in a Box Plus Holder

Choose an appropriate box. I took an old power supply box and some paint.

Step 10: Conclusion

This is the whole project at the end. The speaker is where the psu fan was. The probe itself is very sensitive and a must to have it. I hope you will enjoy the project. See you!

Step 11: Gerber File.

In addition, this are gerber file. You can upload those files to a pcb manufacturer. You can see the future result here: https://gerber-viewer.easyeda.com/ by uploading the .rar gerber file.

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    32 Discussions

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    t400

    14 days ago

    If any want to sell one I will buy it

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    GCeglia

    4 weeks ago

    Hi Yannick, is there any suggest watt (1/4, 1/8, 1/2...) for the resistors? Thanks for your reply :)

    1 reply
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    Yannick99GCeglia

    Reply 4 weeks ago

    All resistors are surface mount 1/8 watt

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    JohnF555

    Question 6 weeks ago on Introduction

    Yannick, I did check into the gerber viewer easy eda and it appears that the circuit top diagram appeared on my monitor but one thing i noticed is that what appeared on the easy eda is different than the pdf circuit I got from paul's patreon page. Why? Am wondering if the gerber is not the super probe pcb and the pdf clearly has carlson super probe written on it. Any ideas?

    1 answer
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    Yannick99JohnF555

    Answer 6 weeks ago

    John, I don’t know for the transparency. Never try that before. Now, for the Paul’s gerber vs mine. It’s not the same. The schematic is the same but pcbs are not. So, t’s Normal if you are seeing differences. I did my own version of this with paul’s Schematic. That’s why

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    JohnF555

    Question 6 weeks ago on Introduction

    Yannick, numerous questions. I downloaded the PDF's from Pauls patreon page and I also downloaded the gerber files but unfortunately it looks like I cannot view them (gerber files) on my old PPC mac G5. Regarding the PDF's from Paul Patreon page I am wondering if all the writing is going to mess up the process of etching pcb board. I intend to print the diagram to a clear transparency using my old epson ink jet printer, try to wipe off the writing so as not to interfere with the circuit board etching and if all goes well hopefully I can make a useable printed circuit for the probe. Will this work?

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    Virgil SeaberYannick99

    Reply 8 weeks ago

    Then, how am I supposed to figure that out? I'm a beginner.

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    KableClear

    Question 8 weeks ago

    Would you be willing to post the BRD/SCH files for the gerbers? Also, have you come across the complete parts list?

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    Sea_08

    8 weeks ago on Step 11

    Has anyone found problems with the component locations pdf file? I overlaid the component locations on the traces and compared things with the schematic. Things aren't making sense. The schematic I used came from EDA (it was easier to read) but I think it is correct. So, for example, R15 on the schematic goes from Q6 emitter to ground, but on the PWB layout it goes from the +5 rail to the base of Q6. So R15 on the layout is probably R14 on the schematic. There are a lot of errors like this, I am working on a correct version of the layout that matches with the schematic. Or, if I am missing something, will someone please help me out.

    7 replies
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    Yannick99Sea_08

    Reply 8 weeks ago

    Hi sea, ok, i got your point and you right... i maybe did a mistake here. I'll double check and i'll let you know. I just reformat my hd so i need to reinstall eagle first.

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    Sea_08Yannick99

    Reply 8 weeks ago

    I can save you some trouble. Here are the corrections. I also checked the amp and that looks OK. If you agree with the corrections, maybe you could post an updated gerber file.

    Plus, I'm curious: in the probe you built, are the components in the right place? If so, how did that happen? If not, how does the probe function? I think I know the answer, but I'd like to hear your opinion first.

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    Sea_08Yannick99

    Reply 8 weeks ago

    I think you are mistaken. According to the schematic, R15 goes from T6 emitter to ground, and the T6 emitter also goes to the Audio + pad. See the attached file showing how a TO92 Q6 would be installed.

    Also, from your gerber, I don't see any through-holes for Q6, did you use an SOT23 there or a TO92? I think either will work, but we need the pads/holes to match the part. Can the SOT23 handle enough current for the LED?

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    Yannick99Sea_08

    Reply 8 weeks ago

    Your schematic is wrong. Look the carlson video at 11:40 and compare your schematic with his schematic. You will see that your schematic is wrong.

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    Sea_08Yannick99

    Reply 8 weeks ago

    Yes, I agree, and I see what happened now. The video does not include the r- or c- numbers, you created those in your schematic. I had difficulty reading your schematic, and found another created by user plafee over at EasyEAD. He/she assigned r- and c-numbers differently than you did, and also included C12 that didn't need to be there. So your gerbers would not match up with plafee's component labels.

    Sorry for all of the confusion, at least I learned a lot by going through this exercise. One final question if you don't mind: Did you use an SOT23 or a TO92 for T6? I'm guessing SOT because I don't see any holes for T6 on the gerbers. I'd just like to know because I might use your gerbers to order some boards.

    Thanks again for your help.

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    Yannick99Sea_08

    Reply 8 weeks ago

    No problem. Have fun with this project. I'm using sot23 :)

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    DonovanP

    8 months ago

    Hi, could you please add a component sheet that corresponds with the values in the gerber files ?

    1 reply
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    Virgil SeaberDonovanP

    Reply 2 months ago

    Did you ever get hold of a component sheet for the "Gerber" Carlson Super Probe PCB's. I sure would like a copy too!