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

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1answer
39 views

Add male pin headers in DesignSpark PCB [on hold]

I've been struggling with this software to find male pin header connectors but I could not find it even on the online database, has anyone an idea ? Thanks!
-6
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0answers
36 views

How do i design an ideal clamping circuit using a switch? [on hold]

The clamping should be such that the waveform is either completely shifted to the positive axis or to the negative axis. What should be the values of R and C?
-1
votes
0answers
71 views

Will this circuit function? [duplicate]

I have this circuit, based on this. I already have a question about this here, but it was getting really long, and hard to read. I created this to make it easier. My circuit: I use an 11.4V ...
-1
votes
0answers
28 views

Making miniature HD DVR from camera or camcorder [closed]

We have a requirement for an HD video recorder to be carried on-board a petrol engine helicopter drone. Recording resolution needs to be 1920x1080. Our gyro stabilised camera gimbal (UAV Vision ...
1
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4answers
1k views

Will my circuit work?

I have a circuit that I believe will work, but I was hoping someone could double check? Removed image to make room for edit. - Original schematic In my circuit, I use a MOSFET, a photo-interrupter, ...
0
votes
3answers
132 views

Are 3-8 input NAND gates common?

If I have, for example, 4-8 (or more) inputs that I need to AND together (or even NAND or OR) should I look for larger input devices like the 7430 NAND or is common practice to daisy chain multiple ...
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votes
2answers
82 views

Simplest possible oscillator (with some constraints) [closed]

I'm interested in finding an oscillator circuit that meets the following constraints: Runs on 9 volts or less Periodicity 100-1000 Hz or so Non-sinusoidal oscillation No inductors 1 transistor or ...
1
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1answer
32 views

Analyzing/designing positive feedback amplifier

I've been searching all around to find a tutorial on analyzing/designing a positive feedback amplifier, especially a single transistor in common collector mode, but with no luck... So, lets say I ...
2
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3answers
449 views

Logic design to circuit — how is it generally done?

So I've designed this CPU with purely logical components (basic logic gates), now how would I go about converting it into a circuit? I know that logical gates can be implemented using transistors, but ...
0
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2answers
110 views

Resistor required for capacitor?

I'm currently working on some simple circuits to learn about circuitry, and being a Physics major I have a pretty good grasp of the mathematics and concepts, but I'm a little confused about ...
0
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1answer
72 views

Topology for a DC-DC step up converter for a single AA battery with 50V 10mA output

I need to design a very compact step up DC-DC converter for the single AA battery (input voltage 0.7-1-5V) with an output of 50V 10mA. The load should drain in a typical case about 2mA, but in certain ...
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votes
2answers
79 views

How many people might have been involved in the design of the Macintosh SE? [closed]

It is really difficult for me to know how many people were in charge of the development of this electronic wonder. When I'm struggling to properly comprehend transistors and how they work, these ...
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2answers
211 views

High EMI PCB track under transistor or diode package

Can a high EMI PCB track under a transistor or diode package (in this case TO247AC) be a problem? To get a better understanding: Is there any advantage on putting these tracks on the other side ...
0
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1answer
92 views

Low-cost Up-Down Servo solution

I have a small project and I'm interested "upgrading" to a more produce-efficient design. Please note I'm no electrical engineer. I want to move a small servo (like this one ...
0
votes
3answers
99 views

Should I use CMOS vs. TTL?

Now, I know that this question has been asked so many times that it seems like I'm trolling, but I must point out that I couldn't find the right answer to this question anywhere. So yeah, CMOS and ...
0
votes
1answer
47 views

fpga verilog dual access

I need to write to a register from 2 sources.. in this case, a pci host and a microcontroller. The 2 will never access the register at the same time (basically once the PCI is done , it hands it ...
2
votes
2answers
87 views

How to design a LIFT simulator using FSM(Finite State Machine)

I want to design a LIFT with the help of Finite state machine. There are four floors. So I took them as 0, 1,2,3 and correspondingly the states. The 0,1,2,3 buttons are present inside the lift. If ...
2
votes
2answers
125 views

Designing shortwave radio receiver

I was building a receiver circuit ( superhet) for shortwave radio, primarily for 20m ( 14mhz) band. The circuit uses 3N211 or 40673 mosfet for mixer. However I have only these components available at ...
2
votes
2answers
66 views

Dynamic Logic - Transistor Sizing

If we have a circuit in dynamic logic: What should the size of the charge transistors (Qe and Qp) be? I know that increasing the size improves the speed but also increases the dissipation, and that ...
-1
votes
2answers
80 views

Designing with ARM SoCs [closed]

I want to learn how to design and develop boards for SoC systems (i.e. i.MX from Freescale). This can be real useful to me because there are countless things I could do with the possibility to design ...
2
votes
1answer
234 views

Reducing Undershoot and Overshoot in a custom voltage regulator?

I'm trying to build a voltage regulator that takes in a reference voltage and an unregulated voltage (to power the components, and this voltage is always greater than the reference voltage) and ...
1
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2answers
270 views

Current limiting voltage regulator to power 12VDC fans

I'm building a ventilation system that will blow air into the back of our parked SUV. Creating a plastic fan enclosure and installing the fans is no problem, but the electronics... well, that's a ...
0
votes
1answer
54 views

Power analysis after placement and routing of ASIC

How can I procure the files stating the details of power consumption of the chip after PNR in SOC Cadence Encounter?
3
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2answers
82 views

How does this shunt regulator work?

I'm investigating battery monitors and I'm looking at TI's BQ76930 to take care of an 8 cell 24V LiIon. They provide the datasheet for their evaluation module (PDF warning) which includes the board ...
1
vote
0answers
91 views

Designing an efficient PSU

I am designing a PSU capable of producing 5 watts @ 5V 1A. The design will power about 12 RGB LEDs (totaling about 400mA @ 5V) and a audio class D 1.4 W amp. Space is no issue but efficiency and cost ...
4
votes
4answers
683 views

Why peltier elements have smaller heatsink on cold side?

I have seen in nearly all configurations that Peltier elements are mounted with huge heat sinks on hot side as compared to tiny ones on small side. Is this just a way of explaining the need of heat ...
2
votes
5answers
153 views

Heat sink, how much does fin and base width matter?

I have lot of aluminum sheet 0.5mm thickness at home, normally heat sinks that I have seen had 1mm thickness. Now I am wondering should I get that sheet welded as heatsink or do I absolutely have to ...
4
votes
2answers
197 views

Would a better heat sink be tall or wide?

If we have a heatsink and want to improve it's efficiency would it be better to increase its width or height? What should be the strategy on installing a fan as well? If we increase height and ...
0
votes
1answer
53 views

Should same sized peltier elements be cascaded?

I learned that peltier elements give better cooling on cascading but need to be growing in size towards the hot side. I have 4 peltier elements of 40×40×35mm and I am planning to make a portable ...
2
votes
2answers
157 views

Designing a low voltage UPS

Preface: I am designing a UPS such that if the AC main fail the device can continue to run for at least 10 days. My goal here is to make a design that can last years off a non-rechargeable battery. ...
11
votes
4answers
1k views

Make a custom plastic case

I have worked on many electronic DIY projects like MIDIbox (http://www.ucapps.de/), it always was fun and working but at the end, the problem was that I ended with a cool gear, but in a poor casing, ...
2
votes
2answers
95 views

How to completely turn off device when float switch is open

Background Below is the circuit I designed to open a solenoid valve after a delay from C2 (represented by L1). S1 is a float switch which closes when a resevoir goes below a given level. The reason ...
1
vote
2answers
89 views

300W Boost converter design

I am designing a boost converter. I know maybe the specs I want would suit better in another topology like Half-Bridge or Full-Bridge but the boost topology is simpler and inductor winding is simpler ...
1
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2answers
138 views

Designing a voltage follower that can provide up to 5A of current to a load

I'm trying to dabble in analog circuit design, but I honestly am a complete newcomer in this area as my strengths are in CS. Sorry if this question sounds stupid, but can anyone help me with designing ...
3
votes
3answers
198 views

Electrical issue with USB ? Hi-speed device not working on own design

Disclaimer, I'm a SW guy, so please don't take anything for granted, and I would appreciate explanations in layman's terms :) We have a custom design based on ...
3
votes
4answers
505 views

Design vs reality and what to do when they differ

I've been trying to focus a bit more on Analog circuits lately and found that my design and actual results often don't match up exactly. An example is a Pierce oscillator I built a while back, the ...
2
votes
2answers
145 views

CPLD: my first project

First, I posted similar question on CPLD/FPGA users forum, however, they do not seem to be as active as StackExchange. So, I hope it will help me to get going with CPLDs and also will be useful ...
19
votes
7answers
2k views

One large microcontroller, or lots of small microcontrollers?

I'm used to doing basic and straightforward things with microcontrollers, relatively speaking. Things such as driving LEDs, running motors, basic routines, GUIs on character LCDs, and so on, but ...
0
votes
2answers
130 views

Value of inductor

I need to wind an inductor with a value between 47uH - 200uH. I have a 10 mm (in diameter) ferrite core from an RF choke used in an old radio (probably lossy ferrite). The core is 3 cm long (I also ...
1
vote
2answers
115 views

Designing effective usage time from 12v car battery

Need a little power design help: I have a project I'm working on where I have measured that I will use approximately 14.4Ah over 24 hours. This is quite the load for a small timelapse setup where I ...
0
votes
1answer
174 views

PIR motion sensor. How to drive 5 V IC from 3.3v input

I'm trying to get a circuit for PIR motion sensor**. I'll need to use 2 sensor's - first in a single trigger mode and the second one is continuous trigger mode. ** HC-SR501 (datasheet, link goes to ...
0
votes
1answer
131 views

Better device than a LM 298

Building a robot that will run on 12V. Using four DC motors and basing my design around an older robot that has been around my school for many years. It uses the LM 298 H-bridge for motor control. I ...
2
votes
1answer
43 views

With a HDL design how/when do we know that we need multi_cycle path, how do we implement it

I understand that we use the multi_cycle path when the delay between launch and latch register shall be more than 1 clock cycle. With a HDL design how can one predict that the combinational logic ...
2
votes
1answer
226 views

How to select a DC-DC converter topology?

I've been simulating a switched mode 12V to 170V boost converter, and it has been quite the learning experience. If my observations are correct, power losses in the circuit not only increase as the ...
1
vote
1answer
342 views

Getting 9V and 400-500mA out of a 24V power supply

I recently bought this power supply to power a microstepping stepper motor controller (which requires an input voltage of 24V). My project requires the ability to dynamically turn on and off an ...
3
votes
11answers
540 views

Uniformly illuminate an array of LEDs: how to get the most homogeneous output?

Please note: this question refers to the electrical engineering part of the design, optical configuration is not request (advices are however welcome) I'm trying to design a LEDs lamp with ...
0
votes
1answer
83 views

Using smaller ram to make a larger ram unit? [closed]

So far, I figure I need to divide the 2k x 22 RAM's into a 4 parallel connection to get the 3 bits data out, and I assume I'm going to need 3G/2K= 125000 rows of RAM, but I'm not sure out to set up ...
0
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2answers
52 views

Voltage sensing

I have a system that needs voltage monitoring. +12 Volt DC -48 Volt DC (-54 Vdc) The ADC chips I can find are limited with input voltage of max 5V. Are there ADCs capable of doing the higher ...
0
votes
1answer
158 views

zvs induction heater mosfet failure?

Hey guys my name is Barrett I'm an electrical engineering student and I'm new to the forums. I've been super excited to put a zvs induction heater together and I finally got all my parts turned it on ...
0
votes
1answer
218 views

How do I calculate the capacitor value (Farad & Voltage) given the pulse current, pulse duration & maximum tolerable voltage drop?

I have an electronic component with following characteristics: Operating voltage: 4.5V Peak operating current: 2000mA for 600uS every 4000uS. The device can ...