USB Oscilloscope With Signal Generator




in this project I want to show you how to make an easy and cheap USB Oscilloscope.

Price: 20$
Frequency: 2-20000HZ
Resolution: 16 Bit
Voltage range:  +-7V / with probe +-70V
Channels: 2
X-Y Mode
Signal generator: Sine, Square, Triangular and Sawtooth 0-20000Hz

Step 1: Material List!

What do you need:

An USB Sound Card (10-15$ on Ebay/Amazone) Important LineIn / Stereo Microphone!!!
A Case 70x70x55mm
4 banana jacks
2 BNC sockets
luster terminals
2 Jack
cable Ties
2x 18KOhm Resistor
2x 180KOhm Resistor
and some solder


soldering iron
cutter knife


I am using Soundcard Oscilloscope by Christian Zeitnitz:

Step 2: Preparing Resistors/Box

In this step we will prepare the resistors, and the Box

With the Resistors we want to make two ten to one voltage divider (one for each channel)
Then we will Connect the Divided side to one of the jacks, and the other side will be the booth channels of our Oscilloscope.

I used the luster terminals to connect the resistors.

Just add the BNC and the banana jack how you want... Dont forget to drill a hole for the outputt wire!

Step 3: Signal Generator

For the signal generator, we will just use the seccond Jack.
Connect the GND of the Jack with two of the Banana Jacks, i prefer black for it.
Now connect one of the other two pins to the first red banana jack and the other pin to the other red banana jack.

Step 4: Put It Together

Now we will put it together,

there is nothing mutch to say, just install the sockets in the box solder them to the resistors and to the Jacks.
I put the jacks with cable ties together, so they fit to the Soundcard.

Then plug it into the soundcard, signal generator plug to soundcard output and Oscilloscope to LineIn /Mikrophone
(!!! Don´T confuse Signal Generator and Oscilloscope !!!)

Step 5: Software

Now Plug it into your Computer, drivers should install now....

Next go to settings and set external soundcard as standart soundcard.

Now install / Start the software i am using Soundcard Oscilloscope by Christian Zeitnitz

The Software is very easy to understand, so I will not dwell on it.

Step 6: Final Step!

Thank you for Reading, feel free to comment

Also feel free to visit my other sites:

it is not the best Oscilloscope but it should be a good start for your Home Workshop/laboratory

!!! Don´T use your internal sound card, it could be destroyed if there will be a voltage peak !!!

If you have ANY questions just comment, and also commment pictures if you made one too, or comment some new ideas for it/ new software....

Additional Ideas:

Add different voltage divider for a better Range
Make a better Looking case
Do the Soundcard ito the Box and use a USB cable...

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34 Discussions


Question 4 months ago

.i just have a question on the voltage range : it says from 7 to 70 V!!! wouldn't that damage the electronics of the laptop ? how many maximum input volt

1 answer

Answer 4 months ago

.. nope, read it again: maximum of 7 Volts, not 70 Volts!
not with those dividing resistances, anyway!

normally, a souncard is having a maximum 0,7 V input capability.

later: ummm... i rad it again... yes, he stated a maximum of 70 Volts.
but i am sure this is correct only using a "real" oscilloscope probe at 10:1.
this means a 10x attenuation, so, you can measure 70 V without frying your soundcard.


Question 1 year ago

how is cable install for signal generator ? can You show diagram ( like x and y )


1 year ago on Introduction

Dear sir, can I use to curve tracer ( x and y) this osciloscope for component tester.


2 years ago

firstly i thank u for posting this article..

i have a question regarding the function generator in this device that likwise the software sound oscilloscope which you are using for oscilloscope in this model what software is to be used for function generator and till how much max voltage i.e amplitude vp-p and max frequency is waveform generated in this function generator model and is the amplitude and frequency is variable in this model ??and if so how can it be varied please explain me briefly??

Eng HowT

3 years ago

Thanks for the great project! can we use them on Andriod Osc Apps?

Eng HowT

3 years ago

Thanks to share this great project! very helpful! can i use this circuit to use on Andriod with this Apps ? --> Oscilloscope Pro


3 years ago on Introduction

Hey, thanks for your toutorial. But I have one question. I bought the same adapter you used but on the Oscilloscope I get the same reading on both channels.


4 years ago on Introduction

I am looking at getting back into radio and want to tune / align my old radios. Test equipment is expensive and want to try and use my PC as much as possible for things like an Oscilloscope and Signal Generator etc. Would I be able to utilize yours and how to connect to PC.

1 reply

4 years ago on Introduction

that's a very interesting project..very nice work :) ..i just have a question on the voltage range : it says from 7 to 70 V!!! wouldn't that damage the electronics of the laptop ?


Hi hi. Would this adapter work?


4 years ago

what is the maximum frequency it can handle/detect?

1 reply

Reply 4 years ago on Introduction

The most sound carts can handle 20Hz to 22kHz, but also some start at 2-4Hz and end at 198kHz, what would then be the maximum frequency. :)