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Type: Posts; User: _Eduardo_

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1. ## Thread: Second order RLC circuit

by _Eduardo_
Replies
15
Views
2,708

### Closed: Re: Second order RLC circuit

Because it's an inductor. The voltage at its terminals is not defined by the current but it derivative.
2. ## Thread: Second order RLC circuit

by _Eduardo_
Replies
15
Views
2,708

### Closed: Re: Second order RLC circuit

Of course, but has no effect on the current derivative at t=0+

Just think on the standard RLC: Vc + Vr + VL = 0

But VL = L I' = L Vr'/R

then Vc + Vr + (L/R)Vr' = 0

At t=0+ ...
3. ## Thread: Second order RLC circuit

by _Eduardo_
Replies
15
Views
2,708

### Closed: Re: Second order RLC circuit

You start well:

At t=0+

Il = -Ix = 2A
Vc = 16V
Vx = -24V
Vr = 16V
4. ## Thread: Second order RLC circuit

by _Eduardo_
Replies
15
Views
2,708

### Closed: Re: Second order RLC circuit

Hi.

At t=0+ Vc=16V and I=2A then V_R12+V_R8 = (12+8)*2 = 40V ==> VL = Vc-(V_R12+V_R8) = 16 - 40 = -24V
5. ## Thread: Second order RLC circuit

by _Eduardo_
Replies
15
Views
2,708

### Closed: Re: Second order RLC circuit

At t=0+

Vc=16V ; I_L=I=16/8=2A
and

L I' + (R12+R8) I = Vc ---> L I_0' + (R12+R8) I_0 = Vc_0 ---> I_0' = 16 - 20*2 = -24A/s

Then V_R_0' = R8 I_0' = 8*(-24) = -192V/s
6. ## Thread: solving differential equations help

by _Eduardo_
Replies
2
Views
1,844

### Closed: Re: solving differential equations help

Hint:

xy' - y = x^2 (y/x)'
and

y' -3x^2 y = (y e^(-x^3))' e^(x^3)

Then
7. ## Thread: Op-amp circuit analysis

by _Eduardo_
Replies
7
Views
1,085

### Closed: Re: Op-amp circuit analysis

In such process, dependant-sources cannot be passivated.

by _Eduardo_
Replies
2
Views
659

9. ## Thread: RL circuit simulation problems in proteus

by _Eduardo_
Replies
17
Views
1,344

### Closed: Re: RL circuit simulation problems in proteus

Diode is not a switch, use a controlled switch like a relay.

148491
10. ## Thread: Serial trouble with boolean algebra

by _Eduardo_
Replies
12
Views
2,001

### Closed: Re: Which Law is this ?

B + !BA = B(1+A) + !BA = B + BA + !BA = B + (B+!B)A = B + A

But is more easy to see with kmap.
11. ## Thread: I Need help on this K-Map

by _Eduardo_
Replies
3
Views
1,033

### Closed: Re: I Need help on this K-Map

Yes, you are using a curious way to assign the 1's in the kmap.

Perhaps a wrong conversion decimal to binary.
12. ## Thread: Resistor and current calculation

by _Eduardo_
Replies
10
Views
2,888

### Closed: Re: Resistor and current calculation

Do you think that the same circuit is used for a current of 100mA than for a current of 100A?

For a motor you not need any voltage converter, it's enough a simple pulse width regulator.
...
13. ## Thread: Resistor and current calculation

by _Eduardo_
Replies
10
Views
2,888

### Closed: Re: Resistor and current calculation

Keep in mind https://www.aliexpress.com/store/product/DC-DC-Buck-Converter-4V-40V-1-2V-36V-8A-100W-Step-Down-Voltage-Power-Module/1414081_32760917735.html

But you should have started with: ...
14. ## Thread: Resistor and current calculation

by _Eduardo_
Replies
10
Views
2,888

### Closed: Re: Resistor and current calculation

Look for a MC34063 online calculator (ie https://www.electronicproducts.com/DC-DC_Circuit_Calculator.aspx )

But in the datasheets you have circuits diagrams for many configurations and...
15. ## Thread: Resistor and current calculation

by _Eduardo_
Replies
10
Views
2,888

### Closed: Re: Resistor and current calculation

It's no true "but also reduces the current to zero" , that equation is valid only when Iout=0

When Iout<>0 --> Vout=Vin*R2/(R1+R2) - Iout (R1//R2)

The voltage divider is not suitable for...
16. ## Thread: Chunt resistor measurement

by _Eduardo_
Replies
2
Views
1,217

### Closed: Re: Chunt resistor measurement

If you have a multimeter Agilent U1242B you cannot check in range of mΩ. That 1.6Ω is the resistance of contact+probe_wire+Rshunt

Look for another instrument or a Kelvin bridge.
17. ## Thread: [Moved]: Rc circuit with Iin1 and Iin2

by _Eduardo_
Replies
13
Views
1,975

### Closed: Re: Rc circuit with Iin1 and Iin2

Is the circuit behavior after a certain excitation.
18. ## Thread: [Moved]: Rc circuit with Iin1 and Iin2

by _Eduardo_
Replies
13
Views
1,975

### Closed: Re: Rc circuit with Iin1 and Iin2

But that picture isn't the response of your RC circuit with an ideal current source. Is the response with a voltage source + diode bridge.
19. ## Thread: how to extract a function from an integral?

by _Eduardo_
Replies
2
Views
5,172

### Closed: Re: how to extract a function from an integral?

\displaystyle\int_{0}^{\infty}g(x)\text{d}x = \text{constant} \;\; \forall \; g(x)

20. ## Thread: Transfer function of Multi variable system

by _Eduardo_
Replies
8
Views
2,004

### Closed: Re: Transfer function of Multi variable system

My version is 2008b.

The Bode plot is

140250

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

For versions lower than 2008b try this function:
21. ## Thread: Transfer function of Multi variable system

by _Eduardo_
Replies
8
Views
2,004

### Closed: Re: Transfer function of Multi variable system

I have only a basic knowledge of Matlab (and english) but you can write:

% Data
Rs = 50 ; R1 = 0.075 ; R2 = 0.23 ; % ohms
R3 = 0.11 ; R4 = 0.032 ; % ohms
RL = 100 ; ...
22. ## Thread: Simple Mesh or Node circuit?

by _Eduardo_
Replies
1
Views
627

### Closed: Re: Simple Mesh or Node circuit?

It's OK

But you could avoid a 3x3 system by separating the R_6ohm because does not affect the others.

Also you could write node equations -> only one unknown V(1/4+1/8+1/2) = 48/4 ==> V =...
23. ## Thread: Thevenise circuit problem

by _Eduardo_
Replies
8
Views
1,978

### Closed: Re: Thevenise circuit problem

Your method and results are correct (unless the rounding error)

The exact values are: Rth = 448/89 ≈ 5.033707865 , Vth = 200/89 ≈ 2.247191011
24. ## Thread: Tricky nodal analysis

by _Eduardo_
Replies
9
Views
2,257

### Closed: Re: Tricky nodal analysis

Just write the node equations following the rules:

(1/R1+1/R2+1/R4)V1 - (1/R2+1/R4)V2 = E1/R1 - E2/R4 - I1
-(1/R2+1/R4)V1 + (1/R2+1/R3+1/R4)V2 = E2/R4 + I1 - I2
25. ## Thread: two dimension array problem

by _Eduardo_
Replies
11
Views
2,176

### Closed: Re: two dimension array problem

Microcontroller? Compiler?
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