# All Questions

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### Using an MCU plus an SoC like the TX2 to synchronize multiple CMOS Cameras

I have been looking at various options to obtain synchronized images from three or more cameras. The options available for the TX2 are just simply out of my price range. I accept that of course I ...
13 views

### Is the denominator of the passive high pass filter given wrong?

The following section from a book called AOE shows the Vout/Vin for a high pass filter: But shouldn’t the denominator be square root of the sum of squares of R and Xc? But above the denominator is ...
8 views

### How to calculate Current Emitter (Ie) using Eber-Molls model on an NPN transistor

my computer science professor gave us a problem to code in python involving Ebers-Moll model for circuits where he asks us to find the current emitter (Ie). In the program we ask the user to give us ...
16 views

### Measuring small currents at DC high voltages without floating meter

I'm doing a project with a Cockcroft-Walton multiplier that will output up to 40 kV DC at up to 10 mA. I'd like to know how much current my load is drawing, and due to the nature of what it's ...
12 views

### Making a redundant power source

I want to have redundant power sources for my load in case one of the sources fail. i have 2 separate dc power sources ( from chargers ) and both is rated 5v 2.a. According to my understanding and ...
9 views

### Understanding this current transformer conditioning circuit

See below a circuit used for current transformer signal conditioning. I have depicted the CT using the current source I1. I have the following questions: Are the 2 Pi filters really needed at the ...
26 views

### How low is “low DCR”?

I'm making a circuit with this PAM2401 IC to get 5V from my LiPo cell. Its datasheet calls for a low DCR inductor (on the "inductor selection" section). How much DCR can be counted as "low"? How much ...
22 views

### “One way” level shifter for PWM 4PIN fan control

I'd like to make a 4 pin pwm fan control using 3v3 uC. Fan is 12v powered and I have a 12v to 3v3 converter to power uC (VCC gate is 3v3 uC power). I want to isolate 3v3 VCC and 12v as much as ...
17 views

### Impedance match Fishman guitar pre-amp to IRIG2HD

I'm looking for some help in understanding impedance matching. I'm hoping one or more of you technically savvy electronics folks will jump in and give me a simple circuit recommendation. ...
22 views

### What is the difference between the order LP filter + Op-Amp and Op-Amp + LP filter in practice?

I have issues explaining what really happens on my circuit. I'm trying to make a cardiofrequencemeter with a white LED and a phototransistor. Basically I light the phototransistor, and measure the ...
27 views

### pcb board to board connector dealing with ground current

Recently I am designing 2 separate pcb. one of them will be controller with low current signal paths and the other one will have mosfets to control high currents(about 10A). I am thinking of ...
23 views

### Help Identify Spring Loaded Pushbutton

I found this interesting spring-loaded pushbutton in a battery operated LED torch I've had for a while. It allows for continuous on or off function by (dis)connecting some metallic strips within it. ...
16 views

### L293d, Input Voltage Specification

I have made project " DTMF Based Land Rover ". The whole circuit is working in usual manner. The voltage at arduino output pins is 3.46 volts. And pin no 16 and 8 are Vcc of L293d respectively So ...
17 views

### What's the LC filter arrangement on dual output DC/DC converters?

It's pretty hard to find a filter arrangement for a dual output converter, but I came across the following:- Taken from here. So for the bottom example, is the LC arrangement correct? I always ...
53 views

### Average of flipped square wave

So I need to find what will be the average of a flipped square wave. I know that the high amplitude is 15V and the low amplitude is -9V and the average of the original signal is 2V. What will be the ...
15 views

### 555 PWM motor driver controlled by external analog signal

I used the below 555 timer PWM circuit to control the speed of a dc motor, and it works like a charm :) now i have a requirement to change the PWM speed externally from another module, that module ...
44 views

### Thoughts & questions on custom CPU architecture

I'm designing a CPU architecture. I've come up with a preliminary design: I'd like general thoughts on what I can improve in the design and also I have some specific questions: Is it overkill to ...
102 views

### Is this circuit from a textbook wrong?

(This is not a homework question.) While reading "Digital Computer Electronics" by Albert P. Malvino, I found this circuit on page 121, figure 8-22(a). It claims to be an example of a discrete TTL ...
38 views

### series connected capacitor

simulate this circuit – Schematic created using CircuitLab How does the capacitor behave here? I tried and the led flashed. Does the capacitor work like a diode after charging?
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### Voltage at Collector of NPN less than Minimum allowed for High

I have connected the collector of a NPN BJT (DTC144EE) to the Power_ON pin of my lte module (HL7588). The pin is internally pulled up by a 100k resistor to 1.8V. The module is powered on by driving ...
29 views

### Op-Amp variable pulse generator

I'm having trouble designing a circuit using an Op-Amp (741) to generate pulses. The task given to me is: Design a pulse generator with a duty cycle that is adjustable from 0 to 100% and whose ...
42 views

### amplify/increase current from 9v battery

I have a working circuit that generates a signal (a range of slow and fast tones) and sends them to a speaker. I tried to switch to a piezo driver and speaker and was successful using the MAX9788 as ...
18 views

### Error amplifier in PWM controller

Using the datasheet UC3842 PWM Controller I have modelled error amplifier in it. AC analysis of error amplifier matches with the datasheet plot(Figure 3) - Since I need to clamp the output ...
21 views

### Efficiently rectify 18-20V to 12V AC-DC for wireless charging

Connected to terminal J1 is a wireless charging receiving coil (18-20V AC). Is there a more efficient way to produce 12V DC from this with enough power to drive the charging circuit and wifi comms (...
43 views

### Reset Switch Wiring on STM32

I want to wire a reset switch for my STM32F0 microcontroller. The datasheet suggests the following external circuity to do so: Connected to the NRST pin is a 0.1uF capacitor and the reset switch. A ...
68 views

### Series diode instead of a flyback one

My question is can I use a diode in series with a MOSFET, instead of pusing it as a flyback diode. simulate this circuit – Schematic created using CircuitLab
51 views

### How to make a restart circuit for my circuit

I have a circuit that is on a shield type pcb and would like to create a "restart" circuit, where the circuit's power is cut and reconnected after a set period of time. I was worried that if the chips ...
32 views

### Can I force my battery pack to output specific amounts out of each port? [on hold]

Let me explain, as I wasn't sure how to phrase it concisely in one question. I've got a portable battery charger, this one specifically, and I am attempting to power 2 devices from it. One of them ...
22 views

### EMI Filter - DC DC Converter No Differential Mode Filter Outlined

I am currently looking at installing a DC-DC Converter. https://www.xppower.com/Portals/0/pdfs/SF_QSB300.pdf The datasheet outlines a recommended EMI filter as so: My question is as the datasheet ...
14 views

### sdf generation using prime time

I have a stdcell library which has “.v” file which contains all Verilog RTL models for stdcells. This stdcell library also has a “.lib” and ".db" timing files with all the delay information for these ...
60 views

### How do 100mA ELCBs provide human protection?

Usually we use 30mA rated ELCBs in our homes. This is for our own protection against leakage current. But in instances where you have a 100mA or 250mA 3 pole ELCB used in industry, an earth leakage of ...
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### Observability matrix different forms

The observability matrix formula is present in two forms in textbooks. My question is about which one to use. the first one: the second one: Now when applying both on the same system, I get ...
203 views

### Confusion in PID loop?

I am already studying PID control and some how to some extent I have understood it except one main confusion. When the difference between reference input r(t) and current output value y(t) is zero, e(...
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### how to calculate vb1 and vo in this TTL circuit?

By referring to question (i) how to calculate Vb1 and Vo? can i assume Vb1=Vbe(sat) and Vo=5v?
20 views

### Conclusions about PFD/Charge pump simulation

I have built a Sequential NAND based phase detector with a charge pump that includes a differential amplifier and I want your help make some conclusions about the results I got running all the ...
29 views

### Relationship between Max Swing Vin and Max Swing Vout in amplifier

My teacher ended our Analog Electronics lesson today by leaving us with a question: which is the relationship between the maximum swing of the input voltage and the maximum swing of the output voltage?...
309 views

### Are these 2 resistors in parallel?

So I had a circuit to analyse and I needed to find the equivalent resistor and then I arrived to a confusion. Are R1 and R3 in parallel? Here is the circuit. simulate this circuit – Schematic ...
50 views

### Inrush current with capacitors connected to USB in parallel

I did a project that connected to the PC USB. When the PC is being shut down the Vcc (5 volts) is halted. But I need the voltage source to stay for extra milliseconds after the voltage halt. For that ...
35 views

### What are frequency response and operating frequency ranges of different materials? [on hold]

Consider we have two cylinders of same material and dimensions. Chokes of a copper are wounded onto both. First cylinder is driven with noise generator, producing some input signal. Second cylinder is ...
48 views

### Does 10GBASE-R fully replace 10GBASE-X?

10GBASE-R using 64b/66b encoding scheme (3% overhead) 10GBASE-X using 8b/10b encoding scheme (20% overhead) 10GBASE-R is achieved with single xcvr lane 10GBASE-X is achieved with 4 XAUI xcvr lanes &...
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### The Behaviour of Capacitors’ Plates

Recently I have learned about the behaviours of capacitors are as follows: When connected to a voltage source the voltage on the the plate on the positive side begins to rise slowly until it reaches ...
32 views

### How to connect/use BPRV2125AM?

We want to know how exactly do we make the connections of the photodetector since they are so fragile.Can we do a PCB, and if so is there any IC base for it.How do we work the RF output as we need to ...
74 views

### Virtual Ground in op amp

The concept of virtual ground allows us to approximate both input terminals of an op amp at the same potential. People say that both the terminals are 'shorted'. Do this mean that the current can flow ...
54 views

### Need help creating a divide by 14 counter with a 50% duty cycle in multisim [on hold]

After a bit of playing around I finally figured it out. I will post the circuit just in case anyone has the same question someday.
37 views

### How to derive the transfer function for this Texas Instruments Application note narrowband pass filter

I've been trying to derive the transfer function for this filter but I'm absolutely stumped, and none of the functions I've come up with seem to reflect its actual response. Thanks! (It is taken from ...
28 views

### Power Supply for automotive Circuit [on hold]

I want to create to my electronic circuit, which contains: An ublox GPS module, an ESP32 module, an angle and temperature sensor, a CAN tranceiver. A stable 3.3v power supply able to withstand bad ...
54 views

### Secure storage of Data in external EEPROM

I am working in designing of a prepaid energy meter. One of the most things I should store are (private key, credit and cumulative energy). The private key is stored only once. The credit and ...
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### Writing on one flash memory location could affect whole memory page

I am working on designing energy meter using PIC18F46K80. When the power goes off the meter store data on the flash memory (credit and so). Meter power supply stores enough energy to supply the ...