Plan, sketch, drawing, graph or outline designed to demonstrate or explain how something works.

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1answer
43 views

Powered USB hub

I would like to know if the bellow montage is going to work. I will try to convert a cheap USB hub for a raspberry pi zero.
0
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1answer
15 views

How to use an ASY2400 Xenon Flash Unit

Background: I just picked up an ASY2400 Xenon Flasher unit from a local electronics store. I found this hookup diagram for it: I connected a potential difference of 12V to the board. +12V to pin J4 ...
4
votes
2answers
114 views

Differences between TVS diode and Zener diodes, in diagrams and in practice?

I have been looking at circuit protection using TVS and Zener diodes. I have seen the following symbols used to represent TVS diodes in circuit diagrams: simulate this circuit – ...
-1
votes
1answer
60 views

How to build a DC-DC USB step up adjustable converter 2A? [closed]

I'm trying to find a reliable electronic diagram for a USB adjustable converter (5V~>6V~>9v~>12V). So what I'm tying to do is to use a powerbank (it doesn't have the off function is the draw is low) ...
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votes
0answers
15 views

costructing a difference equation's signal flow diagram

I need a detailed answer to this question, because many students have vary answers. My answer is shown below the question, my friends are telling me that this one is wrong... Tell if it is wrong and ...
0
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4answers
58 views

Is there a special symbol for instrumentation amplifier, to distinguish it from an opamp?

Is there a special symbol for instrumentation amplifier, to distinguish it from an opamp? If I use the opamp symbol in a circuit diagram, it looks wrong, like it's missing components:
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2answers
64 views

What does the open circle in the circuit depict?

The open circle at pin 4 in 555 and pin 13 in 4017 has got me confused. I'm new to electronics and any help will be appreciated. Also does the pin 5 in 555 need to be connected to pin 12 in 4017? ...
0
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2answers
73 views

How to determine which topology a BJT is configured to from a given circuit diagram?

As far as I understand, a BJT in any given circuit must fall in exactly one of the following configurations: -Common emitter. -Common collector. -Common base. So my question is: Are there any ...
7
votes
2answers
171 views

Trying to understand how a guitar pickup switch works

At the risk of being off topic, I need to ask a guitar electrical question. I am trying to replace an old guitar's pickups (including the pickup switch). The idea is to put two active humbuckers. ...
7
votes
2answers
216 views

How does a hair dryer change its motor speed? Diagram included

I'm working on a side project where I need to figure out how a hair dryer works...so I took apart a hair dryer and made a circuit diagram (below). I am much more mechanically inclined than ...
17
votes
5answers
3k views

What does “Piggy” mean in this Schematic?

What does the word "Piggy" mean in this schematic diagram? I found some sections of a schematic where a part is denoted as "Piggy". What does it mean?
-1
votes
1answer
70 views

Help with son's 18 V car [closed]

I need help with the wiring on my son's car. I'm trying to run 2 x front and 2 x rear #QG550 12 V 45rmp motors using independent 18 V power supplies, 18 V front and 18 V rear. I wish to keep the ...
0
votes
1answer
32 views

Feedback Control: Unexpected result for block diagram simplifications using matlab

I made some simple calculations regarding block diagram algebra. The problem is that I don't get the same result using matlab. Here is the system with it's corresponding blocks: $$H_1 = z+2$$ $$H_2 ...
1
vote
2answers
56 views

Why are there high active and low active signals in a timing diagram?

I always see such signals (colored in the image) in a timing diagram. Now I've figured out that they're called: low-activ and for me an OR-gate high-active for me an AND-gate signals. But why ...
3
votes
2answers
135 views

Does a switch schematic symbol have a conventional “polarity”?

I'm studying Rudy Severns eBook Snubber Circuits for Power Electronics; great read by the way. In it he has the following figure, notice the phrase in the caption "including voltage and polarity ...
3
votes
2answers
86 views

Why is this a Moore and not a Mealy FSM?

Can someone please explain how I can tell which FSM type I have? In my textbook I read that output in a Mealy FSM is based on both the input and the present state, but in a Moore FSM it is based only ...
5
votes
2answers
221 views

Drawing current sensing transformers accurately

This is more of a stylistic question than anything else, but it important that the sketch be accurate to convey what is really going on. I'm wondering, how does one draw a current loop that is ...
1
vote
0answers
46 views

Where am I going wrong with my datflow diagram?

I am trying to make a dataflow diagram of this: Here is what I have so far but it doesn't seem right: Where am I going wrong with my dataflow diagram?
1
vote
1answer
84 views

Signal Flow Diagram for a biquadratic section

I'm doing a theoretical preparation for an Electronics laboratory. This laboratory is about Tow-Thomas biquadratic section which can be represented by the following circuit: The first thing that is ...
1
vote
2answers
119 views

AND gate with a single input in a diagram

consider the following diagram: http://ee-classes.usc.edu/ee459/library/datasheets/DM74LS181.pdf ( page 3 ) The first AND gate at the top left of the schematic has only one input! What does this ...
0
votes
1answer
2k views

How do you calculate the total power developed in a circuit?

The figure below shows a circuit with 6 elements This table show the values for the currents and voltages in the circuit. While it's clear that you need to sum the power dissipated for a subset of ...
0
votes
0answers
82 views

Understanding timing diagrams + setting the Flash Wait States number in ARM

I'm trying to understand the Flash wait states which are configurable in my AT91SAM7X256. I have this basic project, and in the startup code the Flash Mode Register is set to provide 1 additional ...
0
votes
1answer
136 views

How to draw the input into the VCC net/bus in a circuit diagram?

I am currently drawing the circuit diagram for a device. To simplify the diagram I already using the ground symbol for all pins which are connected to ground. This makes the diagram much more ...
0
votes
2answers
402 views

Can a Magnet power a fan for a wind and electricity output?

can it really be possible to power a ceiling fan with the use of magnets and could give you a wind and electricity output? how to do it? (For Remote Areas Without Electricity).
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votes
2answers
496 views

Proteus Circuit LED does not work

I am trying to build a double dice circuit. I tried one example I found from the web. But, I have problems with leds, and I am not very familiar with proteus. Could you please tell me why my LEDs ...
-3
votes
1answer
97 views

Circuit diagram of a household connection [closed]

Often, multiple electrical outlets within a given room are all part of the same circuit. So how would you draw an "equivalent circuit" for a four-walled room which has a single electrical outlet per ...
8
votes
3answers
855 views

V/I uppercase/lowercase convention?

Is there any standard in industry for using uppercase or lowercase for V and I in circuit diagrams? I ask this because my book seems to switch back and forth between the two without any rhyme or ...
2
votes
1answer
70 views

Is there a convention for lines separating areas in circuit diagrams?

I often see boxes of various styles to separate areas and increase clarity in circuit diagrams. I'm wondering if there is a line style convention in circuit diagrams for illustrating: A set of ...
4
votes
2answers
884 views

Electrical symbols, what does a dot before a triangle mean?

Good day. Trying to recreate a circuit, but I'm not sure what the dot BEFORE the triangle means. I know after it means invertor, does before just mean it's inverted BEFORE, instead of after? Rather ...
0
votes
2answers
2k views

How to set up load sensor in a full bridge with amplifier?

I I'm somewhat new to electronics so forgive me for what I don't know. I'm learning as I go along here. The overall project is I'm trying to make a scale connected to an arduino board that will ...
1
vote
2answers
77 views

Eye diagram measurement of a CLK using an Oscilliscope

I'm still a junior engineer and wondering how to perform eye diagram measurement of a CLK using an Oscilliscope? My second question: Is the eye diagrams just using to measure CLKs, or one may also ...
0
votes
1answer
62 views

Help me clarify this really unclear diagram?

5.2 Reduce control IC exposure 2a. Connect VS and COM as shown in Figure 6. http://www.irf.com/technical-info/appnotes/an-978.pdf (H-bridge application notes) Do they want me to connect ...
0
votes
1answer
85 views

I need help understanding how this stepper motor circuit works

This is my first time working with stepper motors. The motor in question is a Portescap 55M048D1B (source: http://www.digikey.com/product-detail/en/55M048D1B/403-1016-ND/417823). I am having trouble ...
0
votes
1answer
436 views

Ladder diagram, variation of Latch and Lock

I have a problem for expanding this particular ladder diagram. The cylinder is a double acting pneumatic cylinder type. START -> Start button A+ and B+ -> Cylinder moving forward A- and B- -> ...
1
vote
1answer
216 views

Using a block diagram for the RS flipflop, add appropriate gates for a D-flipflop

I have been given the problem "Using a block diagram for the RS flipflop, add appropriate gates for a D-flipflop". Now, I can create the gate diagram for both RS flipflop and D flipflop ...
0
votes
1answer
635 views

State diagram for 2-bit parity generator

So the question I need help with is: Design a minimal moore state machine for a 2-bit parity generator that outputs ‘1’ if the number of 1s in a 2-bit sequence is odd, and outputs ‘0’ otherwise. ...
-1
votes
1answer
115 views

Trouble finding the input in this circuit diagram

Currently having trouble finding the input in my circuit diagram. I am assuming "z" is my output. As of now my input equations I have figured to be: Da = BC Db = CB' + BC' = C(+)B Dc = C'A' Z = ...
2
votes
1answer
206 views

One-Line Diagram Standardized Symbols Information

Good day, people. I'm trying to get into electrical substation design and I'd like to know which standard sets the rules for substation One-Line Diagram Symbols . Any ideas of where can I get that ...
0
votes
2answers
313 views

Bench power supply “Issues that rouse during build”

I'm building a power supply, based on this instructable and this one I am using 24volts DC power supply, 7+ amps circuit is based on LM338 / 7805 / 7812 Circuit is working although few things ...
7
votes
4answers
726 views

Can't figure out the general formula for electric circuit

I have the following setup. Note the device in the middle says P, not R, so I now how many Watts the device produces. (I'm not sure if I drew the correct symbol there) Calculating the current ...
0
votes
1answer
96 views

Depicting Analog Signal Paths graphically

Is there a 'standard' way to depict analog signal pathways / chains that's simple, concise, and not too mathematical? I've been searching online, but can't seem to figure out what such a diagram is ...
3
votes
2answers
157 views

What's these symbols style name/source?

I've found a lot of schematic diagrams that use this style of symbols, specially in the Wikipedia. I think these symbols are pretty clear and stylish. I would love to use them for the schematics I ...
0
votes
1answer
90 views

What does “zo <=500Ω” on the pin diagram means?

There is device (viewfinder). It has "Tally" LED. On the camera's output diagram, on the "Tally OUT Indicator" pin there is marking "zo <=500Ω". What does it mean? Should I supply + voltage on this ...
0
votes
3answers
125 views

What does having the v in the center, with the positive near the top wire and negative near the bottom wire mean in this circuit diagram?

This is the diagram that I am asking about: I understand that the symbol on the left hand side of that middle branch is a current controlled current source, and the symbol on the right is a current ...
0
votes
3answers
515 views

How Do Batteries Behave In Series-Parallel (Verify)

Hi I am confused about How batteries behave in series and parallel. I read online and saw that as you stack more batteries in series, the voltage adds together and the mA's stay the same, and if you ...
1
vote
0answers
149 views

Wiring diagram and phase number of three phase transformer

Does anybody have an idea how to draw vector diagram of primary and secondary of a three phase transformer? For instance, if I need to draw vector diagram for Yzn5 diagram and then also draw the ...
0
votes
3answers
750 views

What's the reason for wiring a relay this way?

I came across the following automotive wiring diagram: One thing I don't quite understand is the way they wired the relay. I've got two main questions. It appears to me that they used the exact ...
0
votes
2answers
668 views

How to calculate address range of memory chips

Hi I am not an Electrical Engineer but need to know something about Memory address ranges. I need to calculate address range of each memory chip(62256) from let suppose bank 1 in below diagram. How ...
0
votes
1answer
71 views

ACS758KCB Wiring Diagram

I am using the ACS758KCB Hall Effect sensor for a project. On the front page of the Datasheet it list a .1uF capacitor between Vcc and GND, in addition it lists a capacitor, Cf, between GND and ...
0
votes
1answer
525 views

Undefined part of CSR8645 chip

I am trying to build a bluetooth audio headset and decided to use CSR8645 chip, but while trying to understand diagram of this chip i couldn't identify one part of it. I am uploading picture ...