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4 views

why wouldn't a 9-60DCV 20A PWM motor control work to control a 12v 20A wiper motor

I have a question regarding controlling the speed of a wiper motor with a PWM vs wiring in a rheostat in the positive side. I have a 110ACV-12DCV 20A converter going to a 9-60DCV 20A PWM motor ...
1
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0answers
9 views

How would 'Electronics Right-to-Repair' legislation affect Electrical Design?

Electronics Right-to-Repair has been in the news in the last few years. Some legislation has passed in the automotive industry and it is gaining some traction in agriculture. There's been pushes in ...
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0answers
9 views

Where will the Grid-Tie Power go if it's not connected to the Grid?

What will happen to the extra power that the Grid-Tie Inverter is producing if the demand is less than what the load needs? I have this planned system that I will be implementing soon. The good thing ...
1
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1answer
29 views

Current Sensing Design

while using MCP1630 in switch mode power supply design, in the datasheet they gave the input bias current of the "current sense pin" what are the considerations the designer should take while ...
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2answers
38 views

How do thermal tapes transfer heat despite their low thermal conductivity?

I found myself needing to attach small heatsinks to Mosfets and CC power regulators. Also some high-power diodes. Today I have learnt that thermal compounds, even best in the market, are dozens of ...
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2answers
37 views

Help choosing a transistor to drive an LED strip from a Raspberry Pi

I'm sure this is a very simple question, but as a (near) complete beginner in electronics I would really appreciate a little help in choosing a transistor to switch a 5v LED strip from a 3V RPi GPIO ...
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1answer
26 views

Battery life impact with fast charging

Typically fast charging reduces backup time and life. Now a days almost all handsets are coming up with different fast charging capabilities. I'm currently using Galaxy Note9 which has fast charging ...
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2answers
45 views

Is the direction of an electric field opposite to the direction of a current?

I consider electricity to be an observation of the property of electron mobility. If electrons go the opposite way of the electric field, what is the connection between the electric field and an ...
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2answers
82 views

Why is information not doubled in this context?

Regarding the following section from a text: Why is information not doubled but increased 4/3 times? Can you give an example to clarify what is meant here? What is meant by information here?
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2answers
44 views

Bipolar Transistor Inverter Circuit Analysis

I have been trying to understand this question and I'm just not sure what equation to use for the collector current. I'm not sure if I need to be using an output voltage function of time? All I have ...
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0answers
33 views

Mapping two buttons press as a 3rd button

I got a cheap controller with only 5 buttons. I thought about soldering a few more in parallel so that pressing any of the additional buttons would trigger some other two buttons simultaneously. Then ...
1
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2answers
67 views

What is a readhead?

I found this term many times on this website : https://www.renishaw.com/en/rgh34-incremental-encoder-system-with-rgs40-linear-scale--6450 It seems to be something related to a sensor or a transducer, ...
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2answers
38 views

How does a computer address ddr 4 sdram memory?

I want to be able to manual address a 4gb ddr4 memory stick. looking at the datasheet for ddr 4 there are only address pins from A0 to A17 which is 18 bits, 2^18 = 262, 144 address spaces. So how does ...
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0answers
32 views

Flyback Isolation Transformer Alternative

I am using the mEZS84801A as a reference design as shown below. It uses the MP8007 PoE chip. I have modified and tested this PoE system successfully and my camera be powered and it can run at 1 ...
-1
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1answer
38 views

Battery (e.g, LA, SLA, L-ion) usage recommendation

For the same Capacity requirement, which of the below options is better? 1. Single battery with full capacity (AH) 2. Multiple battery (in parallel) with total same capacity (same AH). For example, ...
0
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1answer
21 views

How to calculate the max transfers per frame and the remaining bytes in USB protocol?

Could someone explain the attached table and how the values are calculated? (the table is taken from the official usb 2.0 specification page 42). What I could understand is just the relation between ...
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0answers
23 views

Sprinkler Controller Wiring (Power) [migrated]

I bought a new Rachio 2 controller and the power has black, white, and ground wires but there are only black and ground coming from my electrical box. My old controller (Irritrol) had the black and ...
-1
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1answer
35 views

Looking to make a large surface area 13.56MHz antenna with short range

I wondering about the feasibility of making a 13.56 MHz antenna that would occupy the entire rack of a shelf (5'x2'). The range would need to be small so that it only identifies entities that are ...
1
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3answers
96 views

Strange-looking FM transmitter circuit

I found this simple FM transmitter circuit: I built it an it works rather nicely. There are many simple FM transmitter circuits on Google, most of which look basically like this: These work by ...
1
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2answers
54 views

P-N Diodes in series. Is my solution correct?

I have attempted to work out a solution on a short question relating to p-n diodes. Is my solution correct? The question (from a past paper) : From the question I understand that there are two ...
-1
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1answer
27 views

Connecting LiFePO4 battery to existing UPS (uninterrupted power supply)

I want to install LiFePO4 batteries with the UPS in the link. Can you please guide me how to do it? The UPS has built in charger and that's what i am confused about. http://www.aptinverex.com/...
-2
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1answer
73 views

What type of connector is this for a 24V battery and charger and where can I get them?

I need to identify this connector so I could order it. I also need to find a place where I can buy them.
1
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2answers
49 views

Will a 2.4GHz WiFI/Bluetooth antenna create noise in my sensitive EEG measurement circuit?

I'm designing a circuit for doing EEG measurements and I want it to be very compact. As a result, the WiFI+Bluetooth antenna (2.4GHz) will be sitting half an inch above the electrode inputs. Will this ...
0
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2answers
50 views

Increasing output current of DAC

I have an application where my Arduino is controlling a mcp4725 DAC for a design replacing a sensor on an old car. The DAC provides the analog output voltage, .25V to 4.9V to the computer. I recently ...
0
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1answer
49 views

Resonant Circuits do all capacitors count towards resonant frequency?

I am trying to design a variable frequency oscillator for use in a superheterodyne FM receiver and have been reading First Steps in Radio (http://www.arrl.org/first-steps-in-radio). In this example a ...
1
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1answer
116 views

Why are laptop computers usually powered around 20V DC?

Most electronic devices use 3.3V, 5V (all USB devices), 9V or 12V (very often for electronic music gear), and we usually all have dozains of such wall adapters at home. Even desktop computers have ...
0
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1answer
26 views

dimmer on input of stepdown transformer for amp regulation?

If have a step-down transformer designed for low voltage high amps, and I put a dimmer on the input will that allow me to lower the output amps? I don't care about voltage as it will be negligible, I'...
0
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1answer
62 views

First metal detector by Alexander Graham Bell, how did it work?

Alexander Graham Bell developed a similar device (metal detector) to attempt to locate a bullet lodged in the chest of American President James Garfield in 1881; the metal detector worked ...
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0answers
46 views

Constant current source with capacitor [on hold]

What will be the plot of Vout wrt time? This is the solution I came up with.For t>0,I cannot understand which capacitor voltage to consider.
0
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1answer
26 views

small quality factor

I have to test a quartz crystal and I am not sure what What does it mean to have a low quality factor for an RLC circuit? Does the value of this factor has anything to do with the frequency?
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0answers
12 views

How to model RF-PA in MATLAB when the design values are given?

I have been given a designed Class-E RF-PA - the technology used for the MOSFET, the inductor and capacitor values attached to the MOSFET. I am suppossed to find the AM/AM and AM/PM distortion graphs ...
2
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3answers
59 views

240 volts circuit amp

Basic question, but I have a doubt! I have a pool heater that works from 240 volts. In order to calculate the annual operating cost, I installed a device that measures amperage and adds up the total ...
1
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1answer
49 views

How to short two points(2 wires) without using relay

I have made a circuit with ESP8266 which triggers a relay. Actually, I want to bypass a button which is on a 3rd electronic device, which is a closed box with a very complex circuit. I have soldered ...
0
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0answers
40 views

Using a resistor on one branch of a parallel circuit affects the other branch?

I've wired in one doorbell button to an 18v AC PSU which is working fine, but upon adding a second to the circuit it didn't work properly. I found later that the second type of doorbell needs a '25 ...
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0answers
32 views

Wireless Power Transfer for a toothbrush

The general idea is to charge a cordless toothbrush from 12V DC, instead of the mains. I have used a simple circuit that I more or less lifted from a Linear AppNote/Demo manual (DC1969). I would like ...
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0answers
38 views

Good books or articles for power electronics [on hold]

Looking good books or articles for the "analysis of interconnected power electronics converters"? Could any of you help me refer to those materials. To be in specific, my main target is to learn about ...
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2answers
41 views

AC/DC Converters in Series with the Same AC Source

Would it be safe to connect two identical AC/DC converters in series if they share the same AC source? My concern is that the negative DC output is grounded somewhere in the converters causing the ...
1
vote
1answer
59 views

Understanding a dual op amp integrator circuit

I've come across this part of a circuit from a precision multi-slope ADC, it is described as a "Dual op amp integrator", but I am left confused as to what U11 accomplishes in this circuit, This part ...
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0answers
20 views

Partially functioning code of stm32f407vg board to toggle leds using a push button as an external interrupt

I have written a simple code using CMSIS library functions of Stm32 to blink one built-in led during normal operation and another one when an external interrupt is generated by an interfaced push ...
9
votes
1answer
67 views

What is that component from the ADP5091 Schematic?

I am looking for an explanation what that component does inside of that circuit. It can be found on page 3 of the Datasheet of ADP5091: https://www.analog.com/media/en/technical-documentation/data-...
0
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1answer
48 views

8085 μp; Why does Read cycle take 3 T-states and not 2?

In the text I'm following, R.S.Gaonkar it's explained that, During T1, address in Program Counter(PC) is latched onto the Memory Address Register(MAR), During the falling edge of T2 \$\overline{MEMR}...
0
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1answer
60 views

Reverse voltage protection: what is the function of C8 in this schematic?

I am reading about reverse voltage protection and I have found this circuit with its explanation but I do not understand why the capacitor C8 improves the behavior of the circuit when there is a rapid ...
-1
votes
1answer
62 views

arduino resets when switching on relay

Good day everyone I have the Atmega328P-AU on a PCB (Controller IC used in arduino nano). I have made the connections as shown in the arduino website for bootloading and uploading the code. This part ...
0
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2answers
39 views

Unity Gain Buffer Initial Conditions

simulate this circuit – Schematic created using CircuitLab A typical way of analysing the unity gain buffer is: Where A is Open Loop Gain Vout = A(Vin - Vp) and Vp = Vout therefore ...
0
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0answers
33 views

Understanding a low pass filter used in a HV circuit

I have been given the following circuit: The input of this circuit is a 3.3 kV DC signal. The filter is there to stabilize high frequency ripples that might appear on the supply line. As far as I ...
0
votes
1answer
39 views

Cascading/multiple voltage dividers

Could someone explain the voltage readings on the following "oscilloscopes" of the simulated schematics below: (I understand the concept of a voltage divider but it seems something less ...
0
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0answers
28 views

Change my thumb wheel swtches [on hold]

http://www.ia.omron.com/support/guide/15/introduction.html I use these thumb wheel switches to set a 3 digit value which signals my programmable logic controller using 24v. Although very functional ...
-3
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0answers
33 views

Role and operation of Schottky diode

I looked at the circuit below while reviewing the battery charger controller (LTC1760). VCC is the internal regulator output in the battery charger controller, and each Schottky diode is placed to ...
2
votes
0answers
27 views

CA3140 wideband output amplifier

The following circuit is nearly exactly what I need for the output stage of my function generator: datasheet: https://www.renesas.com/us/en/www/doc/datasheet/ca3140-a.pdf What I don't understand is ...
0
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0answers
27 views

Charging a device with a power bank [duplicate]

So my device has an input of 5V 0.7A, but the cable isn't detachable from the plug so I need to use a different USB to micro-USB cable. My power bank can output on 2 ports, DC 5V 1A and 5V 2.4A If I ...

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