Questions tagged [circuit-design]

a term to describe how a circuit should behaved based on accomplishing a particular task. When designing circuits, one should consider how it works, the target specifications, efficiency, cost effective, code compliant, and ethics.

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54 views

How to solve this non ideal inverter opamp?

it is asked to make a non ideal inverter opamp that has an input of 2mV or and get an output of -100mV, so I think the next circuit should suffice. simulate this circuit – Schematic created ...
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4answers
104 views

How does this RC pulse generator circuit work?

In this video from Ben Eater, he uses an RC circuit to create a push-button "write-pulse" generator for his EEPROM (discussed around the 14 minute mark) that ensures the write pulse fits ...
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1answer
104 views

How to find on circuit why it is burning

I have done a similar design in tinkercad but I don't understand why it is not working..it is burning and the second picture is the design from a youtube video that it is working properly. I have ...
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1answer
63 views

Circuits : Simulation vs Real World [closed]

I'm asking this question to help many others (specially starters) to have a better understanding about differences that may arise between theoretical/simulation results and real world circuit ...
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1answer
45 views

Trying to understand clock circuit (wall clock, not signaling clock)

First of all, electronics is a new hobby for me. I don't have any formal training, so please be patient with me. Probably like many people, I picked up the interest after playing with Arduinos. I ...
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1answer
40 views

How to simulate the CNY70 IR reflectometer with TINA or LTSpice

How can I model the CNY70 IR reflectometer from Vishay (click here for datasheet) using TINA or LTSpice. In particular, I would like to simulate the circuit shown below: The 4pins on the left side ...
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0answers
43 views

Real life applications of High Voltage Low Current and High Voltage High Current voltage regulators using IC 723

I am looking for the real life application of HVLC and HVHC voltage regulators using IC 723 for my college presentation. I tried looking up for it but couldn't find something. So can somebody help me ...
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1answer
34 views

How to switch an output based on specified voltage difference (outside of rail tolerance)?

I'm designing a CAN circuit that will connect a series string of 12V batteries together. The first battery will be tied to a common ground (think vehicle chassis) that will connect to the CAN ground ...
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2answers
59 views

What pins can be left floating? [closed]

I'm quite new to electronics, but I'am wondering what pins can be left floating. For example in a MPU-6050 or HC-05 what pins can be left floating and which do i need to wire
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0answers
26 views

Press-On Hold-OFF Latch circuit Using PIC12F675

I'm not familiar with PIC12F675. I was told that using PIC12F675 is the easiest way to build this circuit. I wanted to know how do I build a latch circuit that works as follows: The circuit is off ...
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0answers
19 views

LiPo balanced charging circuit from USB, controllable by a Raspberry Pi

I am building an RC car controlled by a Raspberry Pi, and I'm not sure how to go about setting up the power delivery circuit. I plan to power it with a 5200mAh LiPo battery, 2 cells, 50C rating @ 7.4v....
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0answers
45 views

Custom Board MCU Troubleshooting

I have designed and assembled a custom PCB using an ATMega32u4 MCU which runs the Arduino Leonardo bootloader. The board powers on and the ISP can detect the MCU and flash firmware, but USB ...
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2answers
21 views

Altium Designer 21 Duplicate Net Name Error

I have a design that is erroring at compilation time with (among other errors) a bunch of duplicate net name errors. I have searched around including reading up on the top result for this problem (...
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2answers
92 views

How to turn a Latch circuit from Press-ON/Press-OFF to Press-ON/Hold-OFF circuit and how to make it auto-off when power is first connected?

I'm building a Latching circuit using 555 IC. The schematic is as follows: The Input voltage is 12V and is used to operate the 555 IC that switches a relay coil through a transistor. When the circuit ...
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1answer
70 views

Pole at infinity and zero at finite frequency

Is there any circuit that has a pole at an infinite frequency and zero at some finite frequency? A first-order RC Low pass filter has a finite pole and zero at infinity and it makes sense, I am just ...
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2answers
67 views

Opamp Compensation For Input Capacitance

I am going through the datasheet of LM7171 for one of my applications. Please see the below circuit. May I know how they arrived at the equation for CF? Is this equation is valid for non-inverting ...
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4answers
96 views

How to wire LEDs and CR2032 battery to make it work

I've got a problem and it seems that there is an issue with understanding electronic's fundamentals. I've got inspired by Jiri Praus video I am trying to make this Rabbit-shape circuit to work. What ...
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1answer
37 views

AMC7135 always regulating to 30mA

I'm building a small circuit to power a heater at 380mA using a 3.7V battery. I'm using an AMC7135 to regulate the current to 380mA. Without the AMC7135 the heater would typically draw ~500mA, so ...
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1answer
42 views

Circuit for safety button which turn off relay power supply

I have safety button with 2m of cable which is normal closed. When somone push safety button, circuit should turn off 5V_REL section. But there is some noise envoirment, and I do not want to 5V and ...
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1answer
51 views

Square wave voltage regulator

I wanted to build a simple amplifier for a square wave generator with the following configuration: The presence of the amplifier is crucial since with my 12Ω load the output peak current may be near ...
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7answers
1k views

Why has the auto-router put my PCB traces on two different layers?

This is my first PCB design. I want to design the PCB layout of the following switched mode regulator: This is the resulting PCB layout in which I've placed my components and the auto-router function ...
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2answers
204 views

Will this circuit manage to kill a 2-stroke engine?

I'm currently building a project that involves a 2-stroke engine. I have tapped into the wires where you would normally place a kill switch in order to get power for some electronics. The voltage is ...
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0answers
37 views

4 bit and 3 bit comparator with 2 bit comparator

Hello so I am newly learning Digital logic design and my professor just started design of functional modules. We did comparator circuits: 1 bit, 2 bit & 4 bit. We have also studied how to design 2 ...
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0answers
41 views

Design a cascode BJT amplifier to achieve a specified voltage Gain

I have been asked to design a cascoded BJT amplifier with the given specifications Voltage Gain = \$76 \ to\ 84\ dB\$ Current Gain = \$66.5 \ to \ 73.5\ dB\$ Power Dissipation = \$ 3.5 \pm 5\% \ ...
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0answers
64 views

Designing a BJT cascode amplifier for decent gain and bandwidth

For my university course assignment I have to design a BJT amplifier using a Cascode stage with the following specifications using LTSpice. Only Vcc=3.3V and ground rails are available as well as a ...
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0answers
38 views

I need help with SCCR

I work as and E/E intern for a industrial panel company. A customer wants a 30kA SCCR panel. The input power is 3 phase 460V, an unknown distance from the main panel in the customer factory. Inside ...
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1answer
47 views

Finding Ro while designing an amplifier

I didn't understand why we are subtracting load voltage from output open circuit voltage in part (c). What is the logic behind it?
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1answer
73 views

Why does this transistor limit the current so much?

I have been trying to understand how a transistor works. I bought a simulator to be able to understand it better. Below is a small circuit I designed. The load is a lamp. The characteristics of the ...
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2answers
24 views

What is the latency of a n tap transposed direct form fir filter with symmteric coefficients? [closed]

what is the latency in number of clock cycles for this architecture? This an architecture of 12 tap transposed direct form fir filter with symmetric coefficients
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1answer
113 views

What are the final steps to arrive at the transfer function for this RCL circuit?

What are the final steps to arrive at the transfer function for this RCL circuit? I am attempting to arrive at this transfer function $$\dfrac{V_o(s)}{V_i(s)}=\dfrac{sL}{CL(R_1+R_2)s^2+(R_1R_2C+L)s+...
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1answer
92 views
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1answer
48 views

No response from 2 working spi devices when they are stacked

I have two identical SPI devices but each off them is on a separate board, they are connected via a header that allows the board to be "stacked" on top of the master controller. the signal ...
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4answers
46 views

A PWM output is going to 0V if I connect an ADC input in a development board

I'm doing a project in which I want to turn on an LED with different instensity depending on the input of a sensor. For now, I'm simulating the sensor with a potentiometer. I'm using an EK-TM4C123GXl ...
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4answers
992 views

Can I connect 24V direct to optocoupler?

I would like to check sensor signal on MCU. Sensor signal is 24V. Therefore, i want to use optocoupler as an interface between MCU and sensor. NC1 is going to MCU pin. My question is if i can connect ...
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2answers
95 views

Water detector with a BC547 and help understanding transistors

I have set up a basic water detection sensor using a BC547 transistor to switch on an LED if there is current between two electrodes (which are spaced about 1 cm apart): I'm trying to understand more ...
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3answers
68 views

Named or Standard Circuits

BJT amplifiers have a few standard configurations, i.e. Class A, B, A/B. Likewise there are a variety of standard OP-Amp circuits such as summing circuits and filters. Is there a publicly available ...
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2answers
1k views

How to remove huge spikes in current

I am making an DC to AC converter circuit in LTSpice. The schematic is posted below. When I plot the current across the transistors, I get huge spikes in the current, as seen in the diagrams below. ...
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1answer
55 views

Karnaugh map -explanation [closed]

I am trying to understand karnaugh-learn. I was trying to solve multiple question on exercises and I failed. I know that, you would like something specific to show you and to answer it based on that, ...
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1answer
52 views

Regarding transistor RC Phase Shift Oscillator

I have been recently studying about the transistor RC phase shift Oscillator. I calculated the attenuation provided by the RC network to be equal to 29. But when we use a transistor to make the ...
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2answers
60 views

Could this simple circuit charge li-ions in parallel?

My goal is to design a circuit that can reliably charge 3.7V li-ion batteries in parallel for extreme high current applications (think over 100 amps). Normally, I would just buy a cheap li-ion ...
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0answers
62 views

Quick simple car lighting circuit question

I have wired up the below circuit in my car and would just like to ask if there are any issues with this circuit. The lighting in this circuit is tapped into three wires from the car's ceiling light. ...
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3answers
62 views

How to convert 220 volts AC into 12 volts DC using a transformer?

I tried to build a circuit that could convert 220 volts AC into 12 volts DC: My voltage output is as I wanted but the measured current is always blank. Can anyone explain why this is happening and ...
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3answers
549 views

Simple and efficient way to send a 5V square wave to an 8ohm 1W speaker

I want to use a 5 V square wave generated by an ATTINY85 to drive a 1 W, 8 ohm speaker at 1 W. The project has to be battery powered. I would like to use a 18650 rechargeable 3.7 V Li-ion battery and ...
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1answer
102 views

schematic design

I have a demultiplexer and I want to design it. It is 1 in 2. It is not a multiplexer. What I did: Truth table. ...
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3answers
114 views

which capacitor and resistance values ​can I get a 2.1Mhz signal from the tlc555 timer IC?

With which capacitor and resistance values ​​can I get a 2.1Mhz signal from the tlc555 timer IC? I tried the astable circuit diagram, but I got an error. Which capacitor and resistance values ​​should ...
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3answers
39 views

Circuits Gate design-NOR

hello,I am trying to do that electronic diagram in the tinkecad. This diagram is a NOR Gate circuit. What I did is this Can you tell me what I have done wrong ? The second image is what I did,but I ...
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1answer
62 views

Combining interrupts and debouncing on a keypad

I would like to interrupt a program when a key is pressed on a keypad, and figure out which key has been pressed. I do not care much for ghosting effects, this is supposed to be operated with one ...
0
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3answers
95 views

Convert square pulse with 24-volt amplitude to square 5-volt amplitude

Can anyone help me to make a circuit to Convert square pulse with 24-volt amplitude and has an variable offset voltage to square 5-volt amplitude and offset = 0 ? I need to take a 24-volt amplitude ...
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1answer
49 views

What to do with the /RST pin?

I'm using this gate driver IC. My question is, do I have to externally pull up the /RST pin? Because it can't be left floating, but I don't get the part that says "pulled down internally". ...
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1answer
91 views

Solar lipo charger: circuit design and validation

I was looking for some simple and cost effective solar lipo charger for my DIY projects...I've seen the GreatScott video about solar lipo charger and i've realized one of it using the same schematic ...

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