The diagram that shows how the parts are hooked up logically. If your question is about a specific schematic software package, use that tag instead.

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34 views

Simple schemes of variable voltage to constant current converter [on hold]

I am quitte new in electrical engineering. Can anyone give simple schemes of a converter of variable voltage into constant current (AC to DC). If it is possible, describe also the main advantages and ...
0
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3answers
45 views

555 AM transmitter

I looked on instructables and I found an interesting(at least for me) AM transmitter made with a 555 timer which acts as the oscillator:http://www.instructables.com/id/555-AM-Transmitter/ Is this ...
2
votes
2answers
293 views

How to ensure the two schematic diagrams are equivalent?

I've tried copying the schematic diagram of a typical circuit from the datasheet, but I'd like to ensure the correctness of each connection. Is there a way to somehow match one schematic diagram ...
0
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1answer
77 views

Circuit and schematics - grounding diode

I've never seen such connection before and I was wondering why the diode is grounded in that configuration.
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3answers
183 views

Is it OK to leave some part out of the schematic if noted?

When I make schematic drawings for my projects I tend to leave things like the power switch, fuse etc. out of the schematic. I do it because I don't feel it's an important part of the circuit, one ...
0
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1answer
20 views

Xref Net Labels in eagle

I'm trying to make a shield for Arduino in Eagle. I connected a floating NET from my shield pin and labeled it as for example ...
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2answers
66 views

Help building a scheme (involves L293D H-bridge)

I'm making a bluetooth-controlled fire truck for my son based on an old wire-controlled truck I bought at a yard sale. It didn't have its wire-remote. I already got Arduino Nano to drive 2 motors ...
0
votes
1answer
47 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 ...
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0answers
50 views

Design of strong small electromagnet coil

Can you help me find drawings and construction of coils, which used in small but powerful magnets like this? Are they just standard multilayered solenoids? But why they are so expensive?
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2answers
70 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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1answer
50 views

PCB/SCH Design: Fuse w/ Holder

How would one go about creating a library component for a through-hole fuse that sits in a holder? The part in question is this: Fuse: ...
1
vote
1answer
49 views

ESC scheme ADC problem

I made own ESC board. Here is schematics: First, I implemented the cycle of 6 combinations of switching signals: A_H, A_L, B_H, B_L, C_H, C_L in loop using delay time before switching to next ...
3
votes
2answers
220 views

Problem in redesigning one EAGLE schematic

In the past I designed a PCB on EAGLE, and now I want to make some changes on it, but it's impossible. You can see it in the picture below: In the old schematic part I can move and delete nets, but ...
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1answer
68 views

What other standards are there than IEEE 315 and IPC?

What other standards are there than IEEE 315 and IPC for creating schematic symbols and component representations??
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2answers
98 views

Help me identify a component from EAGLE schematic

Can you help me identify the "L1" component in this schematic? It reads 33R@100MHz and is defined as an INDUCTOR. Maybe I'm reading it wrong (count on it), but I don't know how to deal with the ...
0
votes
3answers
62 views

grounded emitter or common collector circuit or something else?

first of all, I'm sorry if I did not use the technical correct symbols for the circuit diagram, but I think it will do. I've multiple questions. Maybe someone can give me a hint. I'd like to control ...
0
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0answers
102 views

Help me understand this schematic

I'm trying to understand this schematic. Specifically, how to connect it to an ATMEGA328, as it is intended to do (see here) The arrows are labelled with things like PA0-PA7, PB0-PB7 etc. But when I ...
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0answers
44 views

Is there a proper / better way to represent an unpopulated connector?

So what I am looking for is a way to represent an unpopulated connector that has wires in place of the connector. What we typically use here is what looks like a header layout with a wire to both ...
0
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1answer
67 views

From what organization or document are connector symbols like this referenced?

So in this picture I am asking about the representation of the Plug and Jack. Where does the idea that the plug is rounded on the back side come from? I am trying to put together a best practices ...
2
votes
1answer
68 views

Input and Output symbols in EAGLE (perhaps with Labels and XREF)

I'd like to create arrows in my schematic. The solution (using XREF) to an older, related post gets me most of the way there: Arrows on connections in schematics BUT, with that approach, the net ...
6
votes
3answers
468 views

Is it OK to inject voltage to an unpowered LDO output?

I'm designing for the first time a PCB that can be powered from an external +12V supply or from the USB connector. In the input of the board, just after the power connector (VINLDO net is the +12V ...
0
votes
0answers
70 views

LED Light Trains

G'day, I'm building a table at the moment and I've got old school PCB and components all over it and a 'Danger High Voltage Keep Out' sign in the centre. I had the bright idea of wiring up an 9V LED ...
0
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2answers
176 views

Resistor circuit problem

I am having trouble with a circuit: simulate this circuit – Schematic created using CircuitLab I must calculate the voltage across R1.My answer is to first compute the current running ...
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1answer
33 views

Where can I find schematics for the Microchip development kits?

I cannot find schematics on the page of development boards. Is it possible (generally) to get schematics of PIC development boards developed by Microchip?
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1answer
51 views

Fritzing doesn't treat breadboard power rails as conductors

I'm starting with Fritzing and created a simple schematic. All good. Now I want to turn in into a breadboard layout for my son to follow. All the components are there and connected with dotted lines. ...
0
votes
1answer
34 views

Is it possible to change the grid size in Quartus II schematic window?

Having a schematic for the top level structure of design appears to be a good idea. I have a few schematic symbols that I want to edit. The signal name is too long and does not appear correctly in the ...
0
votes
2answers
96 views

How do I change the frequency of this Vibrato-Circuit?

I am currently looking at an old 60's Transistor Organ (Phillips Philicorda GM752 to be exact). It has an integrated Vibrato-Unit, although the only modifyable parameter of it is the depth (amplitude) ...
0
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1answer
34 views

Altium de-highlighting nets after using 'Find Similar Objects…' command

I can't work out why Altium is doing this, or how to undo it, or how to make it stop doing it. It happens when I use the 'Find Similar Objects... ' option; all of objects that it hasn't found are ...
5
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1answer
311 views

What is this schematic symbol representing?

I found this symbol in some datasheet. But I have no idea what is it? Can anyone tell me?
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vote
1answer
46 views

Making sense of Cadence schematic source files

I'm looking into writing an application to visualize existing cadence (OrCad) projects when provided with the projects design files. I've had a look through the project directories and it looks like ...
2
votes
0answers
56 views

Using a CFL ballast to power 9W UV tubes

I would like to build a low-cost home UV exposure box for PCB manufacturing. Recently my attention was brought to these dirt cheap UV bulbs which are used in manicure drying lamps. I have the ballast ...
1
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1answer
111 views

PNP or NPN Transistor for this schematic?

I am quite new to electronics and hoping to build a voltage regulator using the schematic below. I will be using a 7806 regulator and a 7.4 Lipo battery (yes, the schematic is probably a little ...
1
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1answer
64 views

Where to find Advanced Schottky TTL Schematics

I am currently having difficulty locating the circuit diagrams/schematics for the Advanced Schottky versions of the 7400 IC series. While the standard TTL data books seem to have depictions of the ...
4
votes
3answers
342 views

How to choose components for a circuit

I designed a simple circuit: that I would like to put components on - the point of the circuit is to light the LED when the voltage source is above 4 volts (it won't be more than 5), so I am ...
1
vote
1answer
38 views

How to avoid gated clock on a flip-flop?

I've read that it is a bad practice and I should use the enable signal. Is it also a bad idea to connect a gated, divided clock signal to the enable input?
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1answer
61 views

PCI 164-Pin Design on Altium

I would like to design a PCB having PCI 164-Pin on that shown at image. Is there any component I can add to schematic on Altium or should I just put some I/O ports on schematic?
0
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0answers
48 views

Using PNP 2N3906 to signal GPIO LOW when negative pulse is detected

http://www.savagecircuits.com/attachment.php?s=04cc498cb970ec62cdb517a60346c629&attachmentid=290&d=1430452949) In the attached schematic +5v input is turned into GPIO Low while 0v input is ...
1
vote
3answers
283 views

What does this symbol mean?

What does this schematics symbol mean? Taken from here. I got the PCB and it's not a button.
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1answer
42 views

problem on connecting devices in eagle

i'm still a biginner in using eagle .... well everything is almost fine but i keep having this error .... although i cheked a 100 time Only INPUT pins on net 25 Only INPUT pins on net RXCAN ...
0
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1answer
123 views

What happens to the output of Optocoupler input voltage is negative

Here is an example of circuit using VIshay Optocoupler 4N25 5V to 3.3V GPIO Output (Inverted) Logic +5V Input ---> 0.0V output GPIO LOW +0V Input ---> 3.3V output GPIO High What happens to ...
0
votes
1answer
85 views

What is this M01PTH I see referenced on schematics?

What is this part "M01PTH"? I'm interested in building this "BBQ Temp Controller" Arduino-based project here: http://hruska.us/tempmon/ One component involved is a 12v blower. In looking at the ...
0
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0answers
44 views

How do I create GPIO outputs from circuit to connect to Arduino Micro

how do i design the GPIO outputs so i can connect it to two pins on my Arduino and get the readings. ie. if green didoe is on GPIO 1 = High, other wise Low if red diode is on GPIO 2 = High, ...
0
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0answers
17 views

Unexpected error after Arduino Uo schematic upload to Eagle

I wanted to learn a little bit in board schematic analyze/modification. I am learning Eagle so I've downloaded Arduino Uno official files and the error appears: I've already done 2 or 3 basic boards ...
1
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1answer
35 views

Is it possible to edit gerber file using allegro?

I want make some corrections in gerber file. Is it possible using allegro? Or is any other better method to do it?
1
vote
1answer
120 views

What does the series of circles in a schematic mean?

I saw this series of 4 circles in the schematic of an Arduino board. Similar circles appear in other Arduino schematics, though I don't think they are Arduino specific (which is why I post here ...
0
votes
2answers
128 views

Dual rail switching PSU critique

I am looking for feed back on the following power supply design. This power supply is intended to have 2 outputs: 24V @ 500mA and 32V @ 850mA. When the power supply is in standby, J1 pin 1 is @ 0V, ...
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2answers
129 views

How to view SchDoc files online?

I have a file witch was designed with "Altium Designer". How could i view this file without needing to install "Altium Designer"? it is preferred to do this with an online app.
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2answers
210 views

Schematics: Effect factor and impedance

I have a questions regarding a simple schematic. I would like to calculate the total angle (φ) and power factor (cos φ) of this circuit and the total impedance (Z). -- Not using the complex-method ...
3
votes
2answers
239 views

The usage of chip topography and diagram(schematic)?

Are you an EE? Do you use TI Op-Amps? then you should know the answer of this question. probably that could be interesting for us. If you take a look at the datasheet of TI(or a few other companies) ...
0
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4answers
114 views

Optimize PNP/Diode Schematic

I am trying to design a circuit which has four switches, numbered 1-4 as in the diagram. The circuit should function such that closing switch n turns on light ...