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32 views

Calculating and Simulating Voltage dependent source circuit in LTSPICE - What am I doing wrong?

I'm trying to calculate the total resistance seen by the source v1 in this circuit and we have a voltage dependent voltage source in this circuit with a gain of 0.1 (v1) which is the voltage across ...
0
votes
1answer
36 views

How to calculate the GDDR5 Capacity from this table?

How to get 4Gb capacity from this table? I understand it this way: (1) total address is 14 + 6 + 4 = 24. each address (atom) is 32bit. So total capacity = 2^24 * 32bits = 512 Mbit. I am not sure where ...
0
votes
1answer
57 views

What pins in Radar ECU and Camera ECU should be detected for OC, STG, and STB faults and why?

A typical Electronic Control Unit(ECU) performs Open Circuit(OC), Short to Ground(STG), and Short to Battery(STB) Diagnostics on selected internal and external pins in the ECU. For example, consider a ...
-1
votes
1answer
56 views

Why is the rectifier (using diode bridge) and delay circuit (using IC 555) close together, and malfunction? [closed]

I designed a rectifier (using diode bridge) and delay circuit (using IC 555). When I tested both circles by connecting but separately connecting the two PCBs The end result is working normally. But ...
-1
votes
2answers
72 views

Would there be any safety issues if the input voltage on the primary coil is bigger than what the rated voltage is?

I have a neon sign transformer that converts 120 V to 12 kV which is the rated voltage. Using the 1:100 ratio would it be safe to have the input voltage be 140 V converted to 14 kV when the specified ...
0
votes
1answer
52 views

How to factor roof angles and inverter efficiency in sizing a solar PV system?

I want to install a number of Mission Solar 420 W PV panels (pdf) on my roof. By estimating an average of 5 solar hours per day over the course of the year, I believe I need 9 kW of panels. So by a ...
0
votes
1answer
57 views

Can I use a 3.7 or 7.4v lithium ion battery to power 6 coin cell motors?

I am doing a project that involves 6 coin cell motors. I am looking to use a lithium ion battery but I'm not sure of what voltage so I'm reaching out to see if anyone has advice. Technical details on ...
-2
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0answers
53 views

Theremin not sensitive enough [closed]

I have repurposed a mini theremin kit for a Paranormal research device. (search Rem-Pod) my problem is, you pretty much have to be touching the antenna to set it off. How do I increase the field so it ...
0
votes
1answer
58 views

How do appliances change their resistance when voltage changes?

Assuming all connections are DC (avoiding any RMS, phase, and impedance calculations), if the power of an appliance is constant, and I change my country from a 240 V to 120 V one, my appliance will ...
0
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0answers
40 views

How many different combinations of connections for 4 connections and 4 wires? [closed]

NUMBER OF COMBINATIONS OF CONNECTIONS 4 CONNECTORS [C1] [C2] [C3] [C4] 4 WIRES --W1-- --W2-- --W3-- --W4-- The catch! Each connector can have 1 of 4 wires or ...
1
vote
1answer
45 views

Can I connect a DC-DC step-up converter to a DC-DC step-down converter in series?

My problem is I need 3A at 5V from an 18650 cell. I bought a DC-DC converter that should do that, but they are garbage specifically the XL6009 it seems that they'd prefer to operate in high voltage vs....
1
vote
1answer
48 views

I2C seems to work but all register reads return 0s

I'm debugging an audio codec WM8962B via I2C. I wrote basic code for a manual I2C read operation of a given register. I'm using PSoC 5LP to do it. The 7bit slave address is 0x1A and I'm trying to read ...
0
votes
1answer
108 views

Are USB cables active circuits?

I always assumed a USB cable between two devices is just a collection of wires. I recently saw some pictures when shopping for cables indicating they have internal circuitry. Could someone clarify if ...
0
votes
2answers
65 views

How can the NSI45020T1G claim to "turn on immediately"?

The On Semi NSI45020T1G, a simple two-terminal inline current regulator, claims in at least two places that it "turns on immediately". However, it cites a capacitance between 2.5 and 2.7 pF....
-1
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0answers
83 views

Amplifier diode circuit

I've made a circuit with the schematic: The output pulses are only 1.5 \$\mu s\$ wide; does it make sense? I also want to get wider pulses, increased to 100 \$\mu s\$, is that possible? Is it ...
1
vote
0answers
47 views

Connecting 2 batteries in a automobile [closed]

I have 2 batteries that I will be connecting to each other in an automobile with a common ground - the vehicle body. The first battery is an AGM deep cycle I believe and the second one is https://www....
-1
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0answers
35 views

Scattering parameters of a 2-port system

So I have been trying to brush up on transmission lines and have come across a question which has me stuck. The question is: Find the scattering parameters of a parallel impedance \$Z_p = 100 - j50\ ...
0
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0answers
35 views

On load pull matching/tuning of the output of a power amplifier, the insertion of a filter and an isolator or circulator

Suppose I have a power amplifier already output matched for maximum power and ready to be connected to an antenna. Now suppose I decided to insert a notch filter at the PA output to suppress a signal, ...
0
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0answers
40 views

Peltier module not cooling

I have a peltier (12705) and I have created adequate cooling for the hot side and a small heatsink and fan on the cold side. The cold side reaches -12°C. I have a cutout in a small box that the cold ...
1
vote
1answer
39 views

Deriving power formulas for transmission lines

I'm trying to derive formulas for active power (\$P_s\$) and reactive power (\$Q_s\$) at the sending end of a transmission line shown below: Where: \$E_s\$ and \$E_r\$ are voltage magnitudes \$X\$ is ...
0
votes
1answer
67 views

Connect IR LEDs to PC via 3.5m audio jack

I have a pair of LED IR emitters like the ones shown below I have connected them to my PCs audio jack but the IR is not turning on. Is there any way I can get them to continuously emit for a head ...
0
votes
0answers
31 views

Battery power for electric door motor

I am adding a motor to my door to operate a latch. The motor needs 12v DC and a third 12v pulse to trigger it to open. The power supply will only be available while the door is closed (it is a pivot ...
-5
votes
0answers
62 views

Designing a sequence detector circuit in verilog, The circuit is supposed to have a one-bit digital input [closed]

I have the task of building a sequence detector circuit with 1 byte input and I need to provide last 2 digit of my ID to the input and it starts from least significant byte, output of circuit will go ...
0
votes
1answer
47 views

Using a power MOSFET for reverse current/battery protection

In the setup below, I am using an FQP47P06 power MOSFET for reverse current/battery protection. The picture doesn't show it, but the battery voltage is 36 V and the current passes through a 12 V ...
4
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0answers
76 views

Self resetting crowbar circuit for over voltage protection

I'm trying to design an over voltage protection circuit that doesn't rely on custom chips (the chip shortage has shown the danger of relying on this,) so I put together a crowbar circuit like this: I ...
-1
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0answers
59 views

Finding a compatible EEPROM [closed]

I have a PCB which is almost like a computer that uses an EEPROM. I don't know much about EEPROMs so I have a quite simple question. The current EEPROM is a 24AA02UIDT-I/OT from Microchip Technology. ...
2
votes
2answers
69 views

Does an ideal voltage source go against Kirchhoff's voltage law?

Very new to electronics. Stuck on this topic: In a circuit with zero resistance an ideal voltage source of example 5 volts will produce 5 volts, since ideal voltages don't have an internal resistance. ...
0
votes
1answer
41 views

Possible fixes to a power supply thermals issue

The question applies to a buck converter design on my board: Here is a 3D view of this section: Layout of this section: L1: L2: Layer 3 is power and layer 4 is again a full ground plane. Here is ...
0
votes
1answer
51 views

Possible problems of AC energy metering using rectified waveforms

I'm building an energy metering circuit with discrete parts and precision is not a big deal in this case. One friend had the idea of rectifying both the voltage and current waveforms before sampling ...
0
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0answers
45 views

A6211 works fine alone, but when I merge two A6211s on the same PCB, there is a current leak

I need some help; I probably lack electronic knowledge here. I got an LED driver circuit from Allegro. It uses the A6211 IC. First I tested it on a protoboard and it worked fine; I controlled two of ...
0
votes
2answers
57 views

Using a voltage follower to stabilize the ground in a single supply op-amp circuit

I was building a distortion circuit using op-amps and had to figure out a way to power the op-amp using a single supply, in other words I wanted to obtain +half supply voltage and -half supply voltage ...
1
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0answers
85 views

How to make a controller for a universal washing machine motor?

I found a broken 2000ish Whirlpool washing machine called AWT4085 in a junkyard. I bought it for a school project like 'E Waste can be reused' topic. It was like 10 bucks or so. It had a lot of ...
0
votes
1answer
37 views

Finding Phase Angle

How would I go about finding the phase angle at different times? For example at 50 Hz with a full cycle time of 20 ms I know at 10 ms the phase angle would be 180°. What calculation could I use to ...
0
votes
2answers
168 views

Discrete amplifier not passing audio

I have a card that can receive two dual input opamp with feedback. The card is currently connected to V+ and V- only for taking measurements. The +24V rail is doing great. I also know for sure that ...
-2
votes
1answer
94 views

Are there any fixed point calculators? [closed]

Is there a fixed point calculator that would convert something like, signed binary, 111.00100 to -0.875? For instance, does MATLAB have anything like that? Below are the steps I am doing manually. ...
0
votes
1answer
78 views

Can a push button with a single click using an Arduino have more than one function?

I've tried to google this and failed, but I am trying to figure out if I can use a momentary push button and some controller like an Arduino UNO (which I have) to activate two LED lights, one after ...
0
votes
0answers
46 views

ATX power supply: start up current over 500 W? [closed]

I just took an old ATX (computer) power supply, wanting to use it as a lab supply (it provides -12 V, +3.3 V, +5 V, and +12 V with plenty of current (except for the -12V)). At home, we have a dual ...
0
votes
0answers
45 views

To turn a ratioed circuit into non-ratioed circuit, what should be the transistor sizes for proper operation of this circuit?

The circuit is at the bottom. I know it is a ratioed circuit however, how can I convert it to a non-ratioed circuit without adding two more PMOS transistors between Vdd and the other PMOSs. Also, what ...
0
votes
1answer
93 views

I would like some feedback on my circuit design based on a DIY op amp circuit

I am following a design based on GreatScott's DIY or buy microphone op amp. I made some modifications and changes regarding the design, and made the schematic using Fritzing. This is my first time ...
0
votes
0answers
27 views

Powering brushless motor only works with separated power supplies

I have recently taken over for a guy who retired from my company and I am working on getting a prototype that he designed back in 2016 up and running. We are using two 3.6 V 18650 batteries to power ...
0
votes
3answers
141 views

Why are we using unpolarized plugs here in Europe?

The whole world is using polarized plugs and only Europe is using unpolarized ones. Why is that the case? Isn’t it better to use polarized plugs? Why aren’t fires starting when you plug in the plug ...
2
votes
0answers
61 views

Control system with one setpoint, one process variable, and two outputs?

I asked a version of this question before and got some unhelpful answers, I think because 1) the minutiae of my question distracted from the core concept, and 2) I didn't adequately describe the ...
0
votes
0answers
27 views

IGBT Power losses and thermal resistance

I just want to make sure if my method is right or wrong and have some questions about it. I want to calculate power losses and thermal resistance of IGBT module in PWM applications and all parameters ...
-2
votes
0answers
35 views

Board to convert a composite video single to spi [closed]

I'm currently undertaking a project which requires a small (around 2.6 inches diagonally) lcd to function, however the only lcds at that size I have been able use an spi interface designed for ...
0
votes
0answers
19 views

ST-LINK/V2 in-circuit debugger/programmer for STM8 and STM32 issue with IAR Embedded workbench

I've been working with ST link v2 programmer/debugger for a while with IAR embedded workbench. Recently, each time I start a debug session or I appoint a break point and I arrive at the breakpoint, ...
-2
votes
0answers
23 views

2.5gbs PCIe to ethernet bridge: where to find? [closed]

I want to use this switch: https://www.microchip.com/en-us/product/VSC7410 I would like to use one of its SGMII ports to connect to a host via PCIe. Microchip does have one of these bridges, but it is ...
1
vote
0answers
76 views

TMC2130 Stepper Motor on Raspberry Pi. SPI issue?

For the last few days I've been struggling to get a NEMA17 (1.5 rated current) stepper motor to function with TMC2120 driver (vref = 1.0) and I'm all out of options now to try, so I'm here looking for ...
0
votes
0answers
25 views

Digital implementation of State Space

I have a question regarding a digital implementation of a State Space controller. I have some rules of thumb when designing; when implementing the observer as well as the sample frequency. I say that ...
5
votes
2answers
174 views

Choosing register value for NTC with voltage divider

I need some help to choose resistor for voltage divider circuit to read temperature using NTC Thermistor. I'm planning to use STM32 with his 12bit ADC. The NTC I'm using has the following properties: ...
0
votes
2answers
63 views

What does this mean about MOSFET load capacitance?

I was reading a paper regarding fault detection in combinational logic circuits and read something that I do not understand. It is about the downsizing of transistors making them more prone to hard ...

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