Hello, I want to make a test circuit with led, button, potentiometer, jumper etc components to test the circuits. By connecting my circuit connectors to this board, I will test whether the relevant lines work. I need schematic and layout examples for this structure and advice to improve it.

 

Welcome to AAC.

Unfortunately, there doesn’t seem to be a question in your post. There isn‘t even enough information to guess at what you want. To get help you are going to have to provide a lot more information.

What is a “test circuit“?
What will it be “testing”?
What are ”circuit connectors”?
What are “relevant lines”?
What would the schematic be of?
How would you know if it had ”improved”?

You have an idea that we don’t have access to. The only way we can know what you are trying to do is if you write down the things you haven’t said yet.

 

Also is it mains powered? Or portable?

 

Test circuits can range from very inexpensive to very costly. And their purposes vary widely. You wouldn't want a circuit analyzer to test Christmas lights, and a simple continuity checker would be useless to trace signals or analyze wave forms.

As others have said - what exactly is it you're trying to do? There is likely a solution. But to arrive at it we need to know where you are and where you're trying to go to. You want to come to my house. But I don't know where you live and you don't know where I live. I could say "Take any freeway to the Wilmington cutoff" but that would be meaningless to you.

 

Years ago, in the absence of a meter I made a rudimentary volt meter with a potentiometer with large dial, op amp as a comparator, resistors, a zener diode reference and an LED which hovered between on and off when the pot was in the right position. Actually quite useful and I’m sure this could be improved to measure current and resistance.
But fairly adequate multimeters are inexpensive and an absolute must have for anyone interested in electronics so making test instruments yourself is not worthwhile unless you are simply doing it out of interest

 

I once made a battery tester using a small DC motor and a plastic screw top bottle cap. Connecting a battery to the motor spun the cap. The cap has ridges to make it easy to grip. Taking a small plastic card, holding it against the spinning cap I'd hear a tone depending on the RPM of the motor. A stronger battery spun the motor faster, a weaker battery spun it slower. Using the tones I could identify which batteries were stronger and which were weaker. Taking a new battery I could discern what a good battery sounded like. Yes, I said a battery can SOUND strong or weak. Using this crude tester that little boy was able to sort batteries according to which had more energy in a descending order. Strong batteries were at the top - weak batteries at the bottom. Mid-charged batteries somewhere in the middle according to how they stacked up against other batteries. And it works even today. Back then I was somewhere around 10 years old.

 

I want to make a test circuit with led, button, potentiometer, jumper etc components to test the circuits. By connecting my circuit connectors to this board, I will test whether the relevant lines work.

I used to sell Willem EPROM programmers. I built this test fixture to test newly assembled boards.


I tired of toggling the switches to check the logic, so I built another tester that was more automated:

 

You are right, I should have given more details about the circuit, I apologize. First of all, I am currently trying to design a circuit that switches the lines and reads the sensors that give voltage and resistance outputs for my graduation project. Then, instead of trying the functions of this circuit by connecting real sensors and elements to be switched, I want to design another PCB and test whether the lines I command to switch with the LEDs I add on it are actually switched. I want to test some reading lines with buttons by pulling them up or pulling them down. I want to design another circuit that will test the circuit with the functions I mentioned by simulating the voltage or resistance values at the sensor outputs with jumper and potentiometer structures. But I need a sample schematic and layout that I can take as an example when designing this circuit, I need advice such as it would be useful to add these functions. Actually, my question is what are your general recommendations for a sample schematic/layout and this kind of test circuit that you can recommend to me when starting to design this circuit. what should I pay attention to?

 

Start with a decent DMM and oscilloscope and work your way up from there.

 

You are right, I should have given more details about the circuit, I apologize. First of all, I am currently trying to design a circuit that switches the lines and reads the sensors that give voltage and resistance outputs for my graduation project. Then, instead of trying the functions of this circuit by connecting real sensors and elements to be switched, I want to design another PCB and test whether the lines I command to switch with the LEDs I add on it are actually switched. I want to test some reading lines with buttons by pulling them up or pulling them down. I want to design another circuit that will test the circuit with the functions I mentioned by simulating the voltage or resistance values at the sensor outputs with jumper and potentiometer structures. But I need a sample schematic and layout that I can take as an example when designing this circuit, I need advice such as it would be useful to add these functions. Actually, my question is what are your general recommendations for a sample schematic/layout and this kind of test circuit that you can recommend to me when starting to design this circuit. what should I pay attention to?

There isn’t really a generic schematic or layout. Start by identifying all of the outputs and inputs that you need to test. Then identify which of these are just variations of a type. Then design a standalone circuit that does the job, on a breadboard, without concern for the PCB you plan to make.

Also make sure you check to see of any of the various versions that use the same inputs and outputs might be better off being consolidated. That is, one board with a selector to choose which test is being performed.

Make a list of all power rails you will need, and keep an eye on choices of passives so you can simplify the BoM where the values aren’t critical and you can use the same ones in multiple cases.

Also consider using an MCU or SBC to manage the whole thing, and to measure and generate signals. That way you can not only automate the testing but you can make changes in software rather than hardware revisions.

 

my question is what are your general recommendations for a sample schematic/layout and this kind of test circuit that you can recommend to me when starting to design this circuit. what should I pay attention to?

There's more than one way to do just about anything. Build something. If it has too many limitations, like my EPROM programmer tester with switches, build a better version.

I wrote a program to generate data to implement a 13 bit binary to 4 digit BCD converter to be programmed in an EPROM with 16 outputs. I was pretty certain that the program output was correct, but I wanted to verify in case I made them available to others. Cycling through all of the addresses manually and verifying the correct output wasn't an option so I used an Arduino Mega to verify the programmed device.

Once I verified it was working, I decided to program another table that reversed the order of the outputs because there were so many addresses that weren't used.

 

As a technical consultant with HP, I used to design and build automatic and manual test systems for manufacturing customers, to test their products in various stages of completion. Before I could build one, I needed a list of the technical details of all the input and output functions, what it is supposed to do and how the manual interface should work. That is called a functional specification.
I suggest that you do the same, to let you know exactly what you will need to do the job. Once you have defined your requirements, it is easy to break it down into the different test functions you will need to design. You can then test and refine the performance of each function before you combine them into one test system. If you have problems with any of the tests, let us know so that we can help you to be successful.