# Questions tagged [matrix]

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### Incorrect results without printing message

I am trying to make a custom tv remote using an ATmeta328p microcontroller. It contains 28 buttons which are wired in a matrix configuration, resulting in 5 outputs (columns) and 6 inputs (rows). ...
72 views

### Why is the coefficient symbol changed?

I'm solving this very basic problem with 3 voltage sources and I have no problem getting to the equations to create the matrix [U=RI], These are: I1-I2-I3 = 0 U1-I1R1-I2R2-U2 = 0 U2+i2R2-I3R3-U3 = 0 ...
58 views

### Detecting magnets regardless of polarity

I'd like to build large matrix of sensors to detect objects placed on it. I can place magnet or metal inside detected pieces. I tried to use reed switch and hall sensors. Hall sensors seems like ...
• 15
43 views

### Replacing a keypad on DYMO LetraTag

I'm rebuilding my label printer to become an Internet service using an ESP8266. It's a fun project, never mind the usefulness. The keypad will be removed and instead my MCU emulates keypresses. The ...
• 163
45 views

### Nodal Analysis and Matrices for more complex circuits

I would like to know how I should write a matrix equation for a circuit containing dependent sources, diodes, capacitors, and voltage sources. I am familiar with the $\small G V = I$ matrix equation ...
39 views

### Combining S-parametric Blocks

I would like to ask you, please, how I can combine general S-parametric blocks together. Consider the situation in the following picture. Considering this example, I would like to connect these three ...
1 vote
125 views

### Mutual inductive coupling in a nodal admittance matrix

I have this question that has been haunting for quite a while now. To compute the nodal admittance matrix $Y_N$ of an electrical network, one can make use of the incidence matrix and the branch (or ...
• 309
58 views

### Autocorrelation function of discrete time sequence

Say you have 2 discrete information sources each one being represented by a Gaussian random variable. This is the idea. Say I want to find the correlation of the 2 to know whether they are stationary....
32 views

### Charaterization of waveguide to coaxial adapter

I'm trying a method to characterize a high frequency waveguide to coaxial adapter( 2-port network). For this, I use 3 adapters A1, A2, A3. After a TRM calibration, I measure A1 connected with A2 with ...
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54 views

### Implement a voltage feedback method to reduce the crosstalkin resistive matrix

I'm new in electronics and i want to develop a resistive matrix that is pressure sensitive. Right now, I have a 7x7 matrix and I'm implementing this using multiplexers, a reference resistor and an ...
90 views

### Effective resistance from a random resistance network

I am trying to calculate the equivalent resistance from a random resistance network formed by carbon nanotubes (CNTs.) I have a MATLAB program where the CNTs are randomly distributed inside a volume. ...
100 views

### RGB LED matrix 64x32 + ESP32 powering

I'm trying to figure out what's the best way to power a 64x32 RGB LED matrix and an ESP32 WROOM 32D using both a power bank (some 18650 2000mAh 3.7V in parallel + voltage regulator) and USB C (5V 3A). ...
499 views

### Solving nodal analysis equations using matrices- gives a full rank matrix

I am trying to solve for node voltages in a circuit using nodal analysis. I am using the fact that the sum of the currents into each node must equal 0. I have a system of equations which can be ...
143 views

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### s-parameter matrix analysis

So I'm trying to figure out how I can analyze S-parameter matrices. The i. should be pretty straightforward, though I'm not 100% sure if I am correct with what it means. I'm assuming that there's ...
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1 vote
131 views

### Row Column Matrix Problem with Flyback Diodes

So I had a simple row column matrix which I am driving with mosfets to power solenoid locks like this: GC is ground via 1.5k resistor C is 24V via 1.5k resistor And these are the connectors: ...