I'm getting on in years now, but need to continually refresh my memory, because I forget a lot of stuff nowdays. Your site is great for this. Keep up the great work !
@beakytwitch7905
25 күн бұрын
I am thinking to build an amplifying sniffer probe. All sorts of options are possible: capacitive "antenna": small inductive coil "antenna": audio amplification and output to a loudspeaker as well. Enjoyed your vid. Thank you. ❤😊
@gorak9000
Ай бұрын
If you're shoving that thing into the non-isolated side of switchers, I'd maybe invest in a $0.02 piece of heat shrink over the wire wrapped around the ground part of the loop too - just to prevent the accidental BOOMs. It might also help keep the coil nice and tight and making good contact with the ground contact on the probe when you slip it on too. But GFCI's can really save you on those as well. Just the other day I was probing something running off of a variac set to 24V that had what I thought was an isolated switcher on it - clearly not, because when I attached the ground clip of the scope, the GFCI tripped! Better that than blowing up the scope! I had to reset the breaker, and put the isolation transformer before the variac, and then everything was fine.
@aduedc
29 күн бұрын
Thanks, you gave me an idea. Use a inductor with ferrite core to better collect EM waves. Here thinking out load: Hey connect inductor with ferrite core to an sma connector, now you have a real probe. You con also put an opamp between inductor with ferrite core and sma connector using a small pcb, now you have active probe for low frequencies. I wonder if we use current probe using hall effect sensor we could make touch-less DC probe.
@InssiAjaton
Ай бұрын
I have built a few of more safe probes with a few wire turns over a small ferrite rod, about 3 mm or 1/8” diameter, 50 ohm termination resistance and several feet of RG58 cable. The coil is mounted inside a foot long phenolic tube and locked in place with either RTV or hot melt near the “far end” of the tube. The length gives great safety testing high voltage inverters or transmitters and like. I have also built a couple of probes with a toroid ring, slotted with a diamond cutting disk on a Dremel. These were mounted similarly at the end of an insulating tube, shorter, as these were intended to following signals (currents) on PCB traces or possibly in bundled wires. As some ferrites are quite low resistance, the tiny toroid (bead) with the slot pointing out of the tube end was left a millimeter or two inside the tube and the end was filled with epoxy. The slot direction was marked with lines on the outside of the tube. That way the probe was directional in a known way. Not truly free of cost, but I happened to have all the materials and tools already on hand.
@Usul
Ай бұрын
The latest generation of oscilloscopes are quite amazing. For under $450 (shipped) you can get a 4 channel 12-bit scope. Love your oscilloscope tips videos.
@thomasherpoel3132
29 күн бұрын
I love the "MSO5354" label on the scope 👌
@brano2yt
Ай бұрын
I'm going to make 10 (100?) winding wire coil for 10x higher DC clamp sensitivity. But this seems even more practical, thanks.
@Travis141123
20 күн бұрын
I use something like that to sniff around radios to check and see if the oscillators are running. I'll also inject a signal the same way.
@ovi_4
Ай бұрын
High, great tool. Tnx. Much safer around the SMPS now. Great. Tnx.
@Manf-ft6zk
Ай бұрын
The probe used shows a resonance frequency of about 10 MHz. With 10pF for the probe this could be around 25µH, it should be less so there is more capacity in the tip. For lower frequencies you can take a ferrite core cylinder coil, my preferred value for a rather small coil is 100µH. - You can also try just not to touch with an isolated tip to apply capacitive coupling with 0.1pF to 1 pF.
@WilliamDudley
Ай бұрын
Love your videos. Minor nit: the form of "perturbation" you are looking for is "perturb", as in "use this proble so as to not perturb the circuit".
@IMSAIGuy
Ай бұрын
Noted. Let me practice. "Some viewer comments perturb me." just joking 😎
@aronhighgrove4100
29 күн бұрын
@@IMSAIGuy Hahaha good one.
@johnwest7993
Ай бұрын
A new probe for the squiggle-scope!
@cocusar
Ай бұрын
I have been using the old timers trick since I first used an oscilloscope. Good tricks!
@AnalogDude_
Ай бұрын
Cool idea
@bobodyuknow
24 күн бұрын
Is there a way to calculate the magnitude of the pick up switching noise/ signal? I would think control over the number of turns and coil diameter?
@Enigma758
Ай бұрын
Is that an Apple power supply? BTW, I love your channel.
@IMSAIGuy
Ай бұрын
no, forgot what it came out of
@robinbrowne5419
Ай бұрын
Cool 😀👍
@CoolStuff..
Ай бұрын
cool
@edwardpacman7082
Ай бұрын
Basically it's a "loop antenna"
@KeritechElectronics
Ай бұрын
Mr Carlson style :)
@rahulkushwaha9500
Ай бұрын
nice trick, i always thought of doing something like this but forget everytime i am around any scope. can you show this on spectrum analyzer also?
You get scopes like this for free? Nice. To be honest... I got my first serious scope for free back in 2004 or 2005. A totally tubular ZRK OS102, clearly Tek inspired. One blown resistor replaced, Bob's your uncle.
@sa8die
Ай бұрын
hi Keri !!!
@KeritechElectronics
Ай бұрын
@@sa8die yeah, you can find me almost everywhere :)
@mp1454
Ай бұрын
😮😊😅👍🏻
@IZ2XAF
29 күн бұрын
what a coincidence, I was using the same dev board 1 hour ago, love your videos best 73s de IZ2XAF
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