All Questions

0
votes
0answers
40 views

Binary multiplyer by 8

How can I design a circuit that take 3 inputs lines and multiplies these inputs by 8 using only 4 bit full adder ?
0
votes
2answers
138 views

Why is a voltage divider used when reading analog sensors?

So when reading sensors (ping sensors/light/pressure/etc...) I notice they always use a voltage divider with resistors before running the input into the ADC input of a microcontroller. Why can't we ...
0
votes
0answers
27 views

DC Voltage Multiplier for Positive and Negative Input

I have a small DC motor being driven by a controller which supplies +6V/-6V to the motor to control its speed and direction (elliptical machine resistance control motor). The issue is that 6Vs is not ...
0
votes
1answer
26 views

Speed of monostable circuit

i need to find a time between rising edge of input signal and generating new output state. I dont have a scope so i cant measure Does someone have imagine how fast it is and how the edges looks like?
0
votes
1answer
28 views

How to Design with an AC Motor for a Specific Acceleration Objective

How do I determine the power necessary to accelerate a pump to meet a specific change in demand? The design is a VFD driving a constant torque positive displacement pump with a varying capacity load. ...
7
votes
3answers
2k views

What is this unknown part?

I'm tracing a circuit. What is this part? This is back of it.
1
vote
3answers
84 views

Simple Non-Inverting Op-Amp Problem

I am trying to double the voltage out from a 1.5V battery using an MCP618 op-amp as a learning experience prior to using the op-amp to amplify the output from a set of strain gauges set up in a ...
0
votes
1answer
27 views

What is the purpose of higher-resistance resistors in Astable Multivibrator circuit?

The astable multivibrator circuit has two higher-resistance resistors (47k on the pic). What are they there for? Wouldn't it work without? And what is exactly their function? I spent a lot of time ...
0
votes
1answer
46 views

USB Power Only - Detect Device Plugged In

I have a project that I need to complete for work. We have been working on this project for a while, however I have come to a bit of a road block. I'll first lay out the important points. We have a ...
0
votes
1answer
22 views

Initial noise prior to square pulse

I have a high voltage system (~5kV) to generate pulsed spark. I was able to detect the spark ignition. It has been shown in the images by the yellow line. This signal will be used to generate another ...
0
votes
2answers
43 views

A GPIO pin opening/closing a high power circuit?

sorry if this a very beginner question but I'm still quite new to the field of electronics generally. I have a requirement to connect a Raspberry Pi to an existing electronic lock, and hopefully use ...
1
vote
0answers
25 views

Arduino Nano - Multiple 5v Power Sources

I am planning on building a small device that sits inline for a SNES controller to allow remapping the buttons. My initial idea is to use an Arduino Nano, but I'm a bit unsure about how best to do it. ...
0
votes
2answers
31 views

Ferrite ring vs ferrite choke interchangeable?

I am assembling a Gimbal controller that needs "Ferrite rings". Can I use Ferrite clamps instead? Do they do the same thing? manual requirement: What I want to buy:
0
votes
1answer
28 views

What is the difference between a BIOS chip and a PCH

From what I can gather, the BIOS chip is a loadable memory space that handles initial I/O, system checks and CAN configure certain things like power states and clock rates, before handing operation ...
2
votes
2answers
488 views

Please identify these capacitors and values

I'm tracing a circuit. What kind of capacitors are these yellow things? The upper one has markings of "105V 212K1", what does 212K1 stand for? The lower one has markings of "335V 136K4", what does ...
0
votes
2answers
26 views

TSMC model for lt spice simulation [on hold]

From where to download the tsmc model file for nmos(slow,fast,typical) and pmos (slow,fast,typical)?
0
votes
0answers
18 views

how to implement Pic18f97j60 with PoE Ethernet

I am a beginner when it comes to mcu and electronics design, I did some projects on Arduino and other ready made microchip boards. However this is my first time building something from scratch. I ...
0
votes
1answer
47 views

How can I turn off automatically, say after a fixed number of cycles, a 555 in astable mode?

I looked at the answer to "How to turn a 555 in astable mode into a decaying square wave" but this is really for an input to a speaker. I want the input to go into a counter to count the number of ...
-1
votes
0answers
58 views

Where Is A Trusted Source For High Voltage Wire? [on hold]

I need 25kV high voltage wire for my big project. I’ve looked for places online for a while now and they all either need a quote or are not genuine. I was hoping someone here knows a place that I don’...
0
votes
1answer
24 views

Time it takes for B to go to zero with R and L given

Given that your solenoid has inductance L and resistance R with initial current I such that there is uniform B inside the coil, I would like to figure out how much time will pass before B goes to zero....
1
vote
0answers
34 views

Implementing a circuit that takes a 3-bit number and multiplies it by 8 using only 1 4-bit adder

I was solving a past exam and this question popped up and nobody seemed to agree on an answer. Someone suggested this solution which is just hacking your way to the required result. That suggested ...
2
votes
1answer
29 views

Circuit protection component arrangement

I was reading this thread and decided that in general it's better to place the reverse polarity protection diode D2 after the TVS rather than before it, and to instead use a bidirectional TVS for D1 (...
2
votes
3answers
1k views

Why do we use a transformer on some heating element projects when the wattage is the same on both sides of the trasformer?

On some projects involving heating elements there's a transformer being used. and the explanation given is "we are using a transformer because need more current" but since the watts on both sides of ...
0
votes
0answers
28 views

Electric connections for Arduino connected to an underwater linear actuator or servo?

I am trying to set up an underwater system (depth <= 5 meters, can be dry cause of tide) which is made of: A linear actuator or linear servo An Arduino A sonar ranger. Basically, I need to ...
0
votes
1answer
48 views

Using a battery as a voltage source in a DC DC converter to supply a second battery?

I was wondering if I could use a battery as Vin to a DC DC converter to charge another battery. Example: Using a Li Ion battery pack and having it go through the DC to DC converter to charge a LiPo ...
0
votes
1answer
22 views

Magnetic ballast with g23 bulb with capacitor

I am trying to make a UV-b photo-therapy light and want to make sure I'm understanding the circuitry correctly-so i don't hastily burn a $50 bulb. Im using a Phillips PL-S 9W/01/2P (link here). It's ...
0
votes
0answers
52 views

Phototransistor interface to PIC

simulate this circuit – Schematic created using CircuitLab Electronical novice (but Advanced Idiot) here. Trying to interface a phototransistor to a Microchip PIC I/O pin. Per the ...
0
votes
3answers
129 views

Make an LED (20 LEDs) circuit battery efficient

I want to wire up a miniature wargaming figurine to have 20 LEDs. As I've poked around options my concern is the battery life and how often the battery would need to be replaced. Since each gaming ...
-3
votes
0answers
59 views

Raspberry Pi motor [on hold]

does the Raspberry pi motor have to be set into a loop to continue running? I need some type of the coding to run this properly
1
vote
3answers
90 views

crystal oscillator Application

(Note: I am aware that crystal and oscillators are two different things but a lot of people use them interchangeably so I am using it in the title.) My question is about Oscillators, all oscillator ...
0
votes
0answers
58 views

Much higher energy use, maybe due to an old electrical heater? [migrated]

We had an 100% increase of power consumption last and this year. It is mostly the night-tariff, which we now consume 27'000 kWh The day-tariff is only around 2'500 kWh. First we thought this may be ...
0
votes
1answer
65 views

Cable identification: Euro plug to triangular shape

I recently found a cable near to a TV that didn't fit anywhere and didn't look familiar in any way. It's a Euro plug on the one end, and on the other end it's three contacts in a triangular shape, ...
0
votes
0answers
62 views

Power switch - IN and OUT connected all the time

A while ago, I asked about detecting whether a power jack is connected or not, in order to select power source from USB or DC jack. You can see the question here: Power selection circuit for USB or ...
0
votes
1answer
80 views

raspberry pi power

I have a VEX 393 motor and was wondering if there was any way that I could hook it up to a raspberry pi and if so how many extra voltage is needed to add to the ground prong (provide diagram if ...
0
votes
0answers
26 views

Design sequential circuit with 3 state buffer

I asked to design a sequential circuit with 3 state buffer so when : Load = 1 -> put data into output Load = 0 -> don't change output Here is my design: But question said also use other gates. Is ...
1
vote
2answers
41 views

Testing the RF properties of an enclosure

I need to measure RF (cellular) blocking properties of an enclosure. Is there an off-the-shelf set of tools for doing this? I'm assuming a MHz signal generator and an oscilloscope with an antenna ...
0
votes
2answers
70 views

Are there still programmable clock synthesizers with single ended TTL output leves (in 2019)?

I'm looking for a clock synthesizer IC that can drive my vintage 5V NMOS CPU in the range of 5 - 50MHz. The granularity would preferably be in the range of 100kHz or less. All I can find when ...
0
votes
0answers
10 views

Documentation or guides for using Thunderboard Sense 2

I'm trying to find some good documentation or guides on how to use the Thunderboard Sense 2 from Silicon labs, however I can't seem to find anything on their website. I was hoping it was documented ...
0
votes
2answers
38 views

Mono to Stereo Pan Knob

I am trying to make a small box to take the mono audio output form my analog synth and run it through a panning knob so I can control where in the stereo mix the mono signal is placed. The goal is to ...
1
vote
1answer
18 views

Simulating process variations

How to simulate Drain current vs Drain source voltage characteristics of a NMOS with respect to process variations in LT Spice?
0
votes
0answers
32 views

How does a time delay affect the Gain and Phase Margin?

How does a time delay affect the gain and phase margin. Answers using nyquist plots would be helpful I know that a time delay of t corresponds to gain multiplying by 1 and phase subtracting omega*T . ...
1
vote
2answers
74 views

Ferrite bead for high-speed digital IC

Although I've seen numerous recommendations for the use of FBs on the power supply rails of noise-sensitive analog circuitry, the opinions regarding their use with high-speed digital circuitry are ...
0
votes
3answers
79 views

Basic resistor question for parallel LED circuit

I'm planning on building an LED circuit to place inside a model miniature for wargaming. The circuit would be in parallel as I'd need a really big battery to power up all the LEDs. I wanted to check ...
0
votes
1answer
46 views

Latching switch, momentary pulse output when switching on

I'm really struggling to find a simple circuit that'll give me a pulse (~1s) when switching the circuit on. The latching switch can't be changed and already controls other circuits, and the new module/...
0
votes
0answers
73 views

What is the maximum voltage the capacitor can be charged in this circuit?

This is a single transistor DRAM circuit. We drive the WL and BL voltage to 5 volts. What is the maximum voltage the capacitor Cs can be charged? Is the dependency of Vth on source voltage important ...
0
votes
1answer
58 views

Potentiometer min and max value

I purchased several of these to drive high power LEDs on a custom project : https://www.amazon.com/gp/product/B019W4C5IE/ref=ppx_od_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 These LEDs are to be ...
0
votes
1answer
54 views

I can't get WDT (watchdog timer) working on ATmega2560

I have a running application on the ATmega2560 and it is working OK. Now, I wanted to implement Watchdog feature in order to reset the chip when the application takes longer to operate for some reason....
0
votes
2answers
39 views

Voltage appears on comparator input

I have made a pcb . A part of the circuit is the Schmitt trigger comparator seen above . The positive feedback resistors are chosen to give the noniverting input values from zero to 0.5 volts . ...
1
vote
2answers
108 views

What's the name of smd buttons build of a simple thin metal sheet which flex when pressed?

As the topic title, I tried to find them but cannot get any informations about. They are a sort of SMD tact switch made only by a very thin curved metal sheet. When you press they flex and make ...
0
votes
0answers
38 views

Automotive connectors for interior use

I have a custom fuel injection project. Rather than place the electronics under the hood, I intend to have the ECU mounted inside the vehicle. This brings up some questions. First, is a sealed ...

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