The process of creating electronic products, including components and end-user devices.

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13 views

Using OA Layout Designs on Tanner L-Edit

I am facing difficulty opening OA designs in the L-edit of Tanner. I have a design kit that has folders for the L-edit for NMOS and PMOS designs that I am trying to open.The instructions in the user ...
-3
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0answers
16 views

Lattice Diamond 3.7 - schematic design [on hold]

I have schematic file (decoder.sch) and I can't rotate an existing symbol - CTRL+R isn't work (is disable) How to rotate existing symbol? Thanks.
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0answers
39 views

Wall-wart blade design [on hold]

I am in the process of designing the Bridge Module that updates the time and allows users to control the system remotely. This enclosure will be plugged into a standard 120V power receptacle. I am ...
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1answer
53 views

Addding Chip Schematics to Proteus

NOTE: I most probably have lack of information on this topic. So rather than reacting furiously or deleting my post; you can inform me, so I can edit/update my post. I want to start learning to ...
0
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1answer
37 views

Using two isolated secondaries of different voltages to power one device

I'm making a simple 555 timer circuit to drive a flyback transformer. The 555 circuit controls an N-Channel mosfet which is what drives the flyback. I have an old receiver mains transformer that I ...
0
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1answer
20 views

What is AO222 based design in concept of design of CMOS cell library?

I am reading a paper "Static Implementation of QDI Asynchronous Primitives" by P. Maurine, J.B. Rigaud, F. Bouesse, G. Sicard, and M. Renaudin. They designed a cell library using AO222 gate, What is ...
3
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1answer
45 views

absolute minimum wire and pad sizes for hand-made PCB's

I manage to get the autorouter in Eagle to complete the routing if I use small sizes for the wire and small clearances between wire and pad and wire and wire. Since I'm making the circuit on a ...
0
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0answers
51 views

Switch circuit design

I tried to ask this question before let's see if can clarify. So I'm building a grape harvester. The equipment has a standard 12 volt system. I have been playing around the past few years with a "row ...
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1answer
46 views

Design of 3g signal repeater [closed]

I am interested in 3g signal repeater and decided to design one. I am planning to just buy 2 antennas and design the amplifier circuit only. my questions are: Should I care much about the antennas? ...
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2answers
50 views

How to select a home automatic circuit breaker?

A room contains electrical devices which has a max demand of 10A (may be more than that in the future). The mains cable from the electric panel (distribution board) is 4 mm2 which can handle current ...
1
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1answer
54 views

I can't find the values of the currents

The picture below is on page 7 of the datasheet of TL497, it is a switching regulator that I use as an inverting regulator (it has an inverting mode) to generate -24V from 12V in input, in the first ...
3
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1answer
106 views

Circuit Considerations

Note: Can skip all images except last, which is a schematic created using the editor. I am at a point in the design process where I have created a schematic of the circuit that I want to create. I am ...
0
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1answer
39 views

24V battery to drive a 5V arduino speed controller and a motor

I would like to use a 24V power supply to power (1) an arduino that will act as a speed controller and (2) a DC motor by using an NPN transistor. I am wondering how I can use the same battery to split ...
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0answers
72 views

How to construct a DC Home Supply System

So I've been thinking hard of how to construct a DC socket to use in combo with a solar setup at home so as to cut losses in using inverter plus DC appliances seem to be generally more power efficient....
1
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1answer
41 views

When do I need separate MLCC (input) and AL-ELEC (bulk) capacitors on my SMPS design?

I've been studying the specification of input capacitance for switching converters. I have a related question here that provides more background. In my research into the topic I came across TI ...
0
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2answers
74 views

5v vs 12v dc pcb mounted relay selection

I'm newbie and just got stuck at design decision whether to go for 5 volt dc relay or 12 volt dc relay in power circuit.Both relays equally mentions power dissipation as 170mW according to their ...
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1answer
58 views

holes in an electronic circuit [closed]

In many electronics circuits, I noticed that they have like small holes printed in them. What is the purpose of these holes?
2
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1answer
65 views

Oscillations in Precision Voltage to Current Converter Design

I am trying to re-design the TI Precision Design - Low Level (5uA) V-to-I Converter. My design goals are: Increase bandwidth from around 1kHz to 100kHz (ideally 1MHz in the future) Increase output ...
5
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2answers
100 views

When to “wind-your-own” vs “scavenge” a transformer?

I often see answers for one-off designs including the advice, "Just wind a transformer...." Like it's no big deal. Did I miss a class in which they handed out a sheet listing the formulas for core ...
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3answers
89 views

What determines the output voltage of this SMPS?

This website http://danyk.cz/impulz4_en.html says that the output voltage is due to the zener diode that has a forward voltage drop of 18V. But zener diode is just a clipper that regulates the output ...
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1answer
73 views

Transistor PWM Switch H-Bridge

Update from old post I have made a completely different design and was wondering if you guys could take a look. Schematics: http://imgur.com/a/5GRe5 Description: Figure 1 is a charge pump, boosting ...
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0answers
40 views

Product Category

I am designing a single phase energy meter with below Spec - Input Voltage 240Vac - Input Current 0.5mA - Product will be sealed in plastic enclosure - Line and Neutral line, No earth Input in product ...
11
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4answers
1k views

Rocket launcher circuit design

I'm building a model rocket launcher with my son. The circuit is very simple as you can see. We want to add a buzzer and a LED/bulb when it is turned on as a warning to stay clear of the rocket. How ...
3
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1answer
67 views

FTDI Vinculum code read out protection

I designed a USB dual host based on a FTDI's VNC2-32L1B. I'd want to protect its firmware from being read/copied cause it contains pretty sensitive data (private keys, etc.), but the VNC2 has no read ...
-3
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1answer
78 views

What electronic component is this? - sensor part of particulate matter sensor [closed]

What electronic component is this? This is a part of a laser sensor which measures particulates.
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1answer
42 views

Narrow bandpass filter using maximally flat LPF prototype design

I'm doing a project involving wireless power transfer, where an LED will be turned on via 2 induction coils (tx and rx). The interfacing power circuitry for this has already been figured out (an ...
39
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5answers
2k views

Ceramic caps vs electrolytic. What are the tangible differences in use?

A quick google around and all I seem to be able to find are people talking about the physics & the chemistry of the capacitors but not how this affects choosing which to use. Avoiding talking ...
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1answer
30 views

Implementation of NIOS Softcore alongwith HDL modules on Aletra Cyclone IVGX

My question is not on 'how can' but 'if can'. So I believe people with sufficient experience on any FPGA family might be able to help me out here. Problem Statement: I need to model a very basic ...
0
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1answer
16 views

Lower Power Inductive Heating Circuit Design Questions

I'm trying to design a very low power (<=10W) inductive heating circuit that will heat the work material to 40-50degC. I've seen plenty of Royer Oscillator circuits online (see here: http://www....
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0answers
87 views

practical design of integrator circuit with Rogowski coil

I am designing a current sensing device, using a rogowski coil.To give a simple explanation of the Rogowski coil, if I were to disregard parasitic components L2, R1, C1 and R2 the output voltage would ...
0
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2answers
59 views

Is there a circuit that amplifies current or voltage relative to signal frequency?

I am trying to create a circuit that outputs a higher voltage/current as the frequency of the signal input (such as an audio input) gets higher - such as to allow all frequencies to bypass a capacitor ...
-3
votes
1answer
72 views

load cell continuously monitor load

I want use 50 kg of load cell of weighing machine to measure 30 kg of load for an one or two months,and load continuously decreases because of consumption on daily basis. my question is that the ...
0
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1answer
37 views

How to to design a PCB lib for components with variable dimensions?

I'm designing various PCB libraries for components. But sometimes they have variable dimensions: How should I design the pads for components with fluctuating values?
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1answer
86 views

When to stop working on a PCB layout

I currently have this PCB layout for a project: Now I'm unsure if I should invest more time to get rid of some vias or if I just should finish it off and order the board. Do vias matter for such ...
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0answers
35 views

Designing a system to move a marble on a rotating beam from point A to point B using a servo

I need to figure out how to design a system to move a marble on rest at point A to point B at rest. See my drawing below for what I'm trying to accomplish: I have an Arduino I could use as a ...
0
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1answer
97 views

Alternatives to mounting tube sockets on a PCB

It occurred to me that since tubes get inserted and removed that this could cause some flexing in the board and break things. Whats the alternative to not mounting it on the PCB for a more physically ...
28
votes
5answers
2k views

Design Calculations for the Seasoned EE

Do seasoned designers tend to do a fair amount of calculations or are large parts of circuits designed intuitively? I'm asking because it seems like design engineers tend to have a sense of what value ...
19
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4answers
2k views

After PCB layout

After you've designed your circuit and have the PCB layout completed, how do people in the EE industry go about designing the enclosure? What kind of considerations need to be made to accommodate the ...
3
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1answer
215 views

Current sensing at μA accuracy and ADC nonlinearity

Project context A battery-operated positioning device sends location information through GSM at regular intervals. Between the fixes, the device is in low-power mode. The battery is supposed to last ...
-1
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1answer
77 views

SFP vs LAN port [closed]

From a board design standpoint, What are the categories to consider when picking between an SFP and LAN port. This is to be used as a 1GE management data path so regarding data rates both options ...
4
votes
1answer
114 views

Getting started with Qualcomm reference designs

I am looking to get started with Qualcomm Reference Designs. I am partly inspired by this article: "Start Your Own Smartphone Company for $1,000". I have an application that I would like to be able ...
0
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0answers
39 views

H Bridge 555 Timer Votlage Drop

I am building the circuit presented at 4:45 in this video https://www.youtube.com/watch?v=iYafyPZ15g8 The problem is the frequency of the output of the 555 timer changes depending on the whipper but ...
-2
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3answers
184 views

Approval before using built portable charger on a smartphone

I've finally managed to set up a more efficient portable charger that uses 8 AA alkaline batteries(actually not so efficient). Schematic: simulate this circuit – Schematic created using ...
0
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2answers
106 views

Can I increase torque and Rpm in a DC electric motor safely using outside magnet

I'm wondering as a layman what would happen if you place a magnet on the outside of a DC motor. This has been documented on YouTube using a small 12v motor. I'm wondering what would happen to a larger ...
6
votes
4answers
977 views

How to get a FPGA design that will definitely work on actual hardware

I have just started learning digital logic design with FPGA's, and have been building a lot of projects. Most of the times (since I am kind of a noob), I have a design that simulates perfectly (...
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0answers
90 views

Finding Values of Rd and Rs to satisfy the N-MOSFET design

I've been stuck on this design problem for a while and I am just filled with a lot of equations and unknowns and not getting anywhere with it. Here's a picture of the problem with the problem ...
1
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1answer
75 views

How to use one 12V power supply to supply two Op/amp with 5V and 12V voltage supply?

I am trying to design a circuit and i have two Op-Amp with different supply voltage with -+12V for LT1220 and +-5V for LT1193. i want to use just one power supply with +-12V. in that case for Lt1193 i ...
0
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1answer
28 views

C4D capacitively coupled electrode sensing - circuit simplification

I am trying to make a detector to pick up small changes in capacitance. Basically both electrodes have a common ground and are closely spaced. One is driven by oscillator at 0.1-1MHz and the other one ...
0
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1answer
91 views

Vibrating bracelet controlled from cell phone [closed]

I was inspired by this project: How do I build a bracelet that vibrates once every n minutes? but I want to take it a step further. The main idea is creating a vibrating bracelet that is controlled ...
0
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1answer
43 views

Values instead of designators on assembly drawing

While creating new Altium component for our company's library I started to wonder: why one would place a designator on an assembly drawing instead of value of a component? Wouldn't it be easier to ...