# All Questions

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### How can I create a circuit in another dimension from my circuit

I have a 9V battery and would like to use it as 5V. I tried a voltage regulator but, as far as I know, it takes too much power from the circuit. My idea, is to do the following: First I want to drop ...
5 views

### How to design a 3V3 device to be safely programmed by 5V ISP

I'm designing my first 3V3 circuit with ATmega8. While the uC itself supports both 5V and 3V3, some of components do not. I'm going to place ISP socket on board and I'm wondering how to ensure that a ...
6 views

### Wireless circuit switch

I'm looking to design a bluetooth or WiFi switch for a circuit. Not an expert in building circuit boards but i've done a bit of it in high school. I've done some research and it seems like IT CC2540 ...
8 views

### BJT differential amplifier saturation

I'm making a long-tailed pair amplifier using a current mirror, the circuit has the following layout: I simulated it on PSpice and it worked, you can see the bias here: I tested it in the real ...
12 views

### Measure speed of stationary bike with belt drive

I have a problem with measure speed of my stationary bike. (also here) Parameters: radius of flywheel is 13cm, second wheel is 12cm (0.12 m); the sensor is simply reed switch I'm trying to ...
5 views

### Timing/buffering issue with Digilent's EPP on Basys2?

(Funny story, when I first tried submitting, StackExchange told me I couldn't add a new tag for basys2, so I clicked the tags input and pressed backspace to delete ...
33 views

### PIC operating temperature… “industrial” vs. “extended”

I am shopping for a PIC microcontroller for use in an automotive application. I noticed that pics are offered in both "industrial" and "extended" temperature ranges ([-40C to +85C] vs [-40 to +125]). ...
18 views

### Looking for an efficient audio amp circuit

It seems like all the circuits that I find are using outdated and inefficient technology that requires massive heat-sinks at anything beyond headphone levels. Is there any particular reason that there ...
17 views

### help in boost converter

I am trying to work on boost converter and my object is to get an output of 6ooV. The maximum output voltage I am getting is 400V. I have attached my design. Can anyone help me in this please?
16 views

### 8th order butterworth frequency response

Ok I'm sure people are getting tired of seeing my filter questions but here's another one. With my new understanding of 2nd order Butterworth filter design I set out to try to design an 8th order. ...
9 views

### Discrete MOSFET driver control IC

I am building a Marx bank, which consists of multiple MOSFETs connected in parallel when charging and in series when discharging. I have each stage of the pulse generator designed, including isolated ...
72 views

### Connecting LEDs to 220v without using a power supply

I'm designing a backlit custom picture frame, and I want to include the power supply (or the lack of one) inside the body of the frame. The problem is, since the frame design is more or less thin, I ...
36 views

### How do I analytically list the correct sequence for the given digital circuit?

Suppose given the digital circuit below, which contains 3 JK flip-flops: Assume that the sequence starts at ABC = 000. How can I analytically list the resulting sequence after every clock cycle?
16 views

### SMD 5050 LED 32.8' with 24v powersupply

So im looking at buying this: http://www.amazon.com/SUPERNIGHT-Waterproof-Flexible-Changing-Controller/dp/B00MN6WTQC/ref=pd_cp_MI_1 Wont the 24v 5a powersupply fry these? The reviews are misleading. ...
31 views

### Could a barcode scanner be used to get surface depth information?

(if tl;dr, go to the part where it says "actual question") this is probably a very obscure question, but: I'm working on a rather complex art installation with computer-generated sculptures, and I'm ...
15 views

### How to preserve MSL 3 devices

I have bunch of ICs that is rated MSL3 that came in a moisture barrier bag. For an urgent work, I needed to open the package to use one device. Could anyone tell me how I should preserve rest of the ...
20 views

### Antenna to reject 5.8Ghz Interference

I live a couple miles past where "normal" high-speed internet is available, and for years I have used a radio WAN link on a 70' radio tower to connect to my ISP in town, 4.65 miles away. I have a ...
38 views

### Ways to connect an SSD drive? [on hold]

I recently burned my laptop's board. I removed its SSD where all my data is. Is there an electronic tool to save the data such as SSD to USB converter? I don't have another PC with SSD to extract the ...
28 views

### Controlling DC motor without Arduino motor shield

I am trying to make a line follower with the help of this tutorial. In the tutorial they have used Arduino motor shield. I want to know, is there any way to control the motors without using Ardumoto? ...
31 views

### 360 dual-wiper potentiometers

http://www.edn.com/design/components-and-packaging/4405828/Rotary-encoder-with-absolute-readout-offers-high-resolution-and-low-cost ^ That's the synopsis of what I'm looking for. I have a bunch of ...
33 views

### How to send a buffer with spi

I use an atmega32 and I want to use the SPI bus. I have the Adafruit 24 channel, 12 bit pwm led driver. I use a buffer to set the pwm for a certain channel. The question is how to send the whole ...
40 views

### Problem simulating a fixed transconductor with LTSpice

I am simulating a fixed transconductor circuit with LTSpice. When I apply $1$V for input voltage, (for DC Sweep) the voltage of collector of $Q_1$ has good amplitude ($30$mV to $330$mV) while ...
27 views

### How to find the resolution of a Integration ADC?

I am working on redesign of a old device. In that a Dual slope Integration ADC is used. I have the value of the fixd time required to Integrate the signal(Ramp Up )(20ms). The Integration ADC is ...
35 views

### SDA line pulled low by slave always?

If due to some problem in slave, The slave is not able to leave the SDA line free , so that master can gain control over it. Its gets low by the slave in between data transfer , but not able to ...
54 views

### Using one channel from adc (pin connections)

For a heart rate calculator project by using Basys2 and VHDL, I am trying to connect ADC0808 in order to get 8bit digital output from my pulse sensor's output. However, although I designed the circuit ...
45 views

### usage of bidirectional mosfet

In the schematic of arduino due there's a mosfet between of "USBVCCU2" and 5V line. http://arduino.cc/en/uploads/Main/arduino-Due-schematic.pdf I refered to T2 (FDN340P) P-Channel Mosfet. What's the ...
44 views

### Design considerations for internal PC parts

I'm designing a PWM fan controller. It will be interally mounted inside a PC and will take power from the normal 4 pin Mate-N-Lock ("molex") connector. The on-board MCU and LCD will draw power from ...
58 views

### Why the $F_{knee} = 0.5 / T_{r}$?

In "High-speed Digital Design - A handbook of black magic" p. 2, The knee frequency for any digital signal is related to the rise (and fall) time of its digital edges, but not to its clock rate: ...
38 views

### PCI Memory and I/O space

I'm currently reading Carl Hamacher's computer organization boook.At Chapter 3 he describes the generic i/o device interface like this : "An I/O device is connected to the interconnection network by ...
21 views

### MSP430 ADC12 samples different value every time

I am doing an interface of MSP430FR5969 with an image sensor. So, I have this ADC settings. The adc input is connected to the analog out of the sensor ...
42 views

### Connecting multiple SPI devices to Texas Instruments CC3200 LaunchPad

I want to connect one of the two (or both) 433 MHz RF receiver modules to the Texas Instruments CC3200 LaunchPad: RFM83CL-433S1 RFM65CW-433S2 I also want to connect an SD Card connector to the ...
33 views

### Spawning threads in SystemVerilog with input variables

I run onto a rather confusing situation where I was writing a code for a UVM monitor. This module performs these operations in order: Listen to channel (virtual interface) until intercepting one or ...
18 views

### Handheld Emulator like JXD [on hold]

I have a pretty simple question, I'm trying to get started with Hardware based Programming so i will program on top of a netduino plus 2 a full automatisized gardening house. My question beside of ...
45 views

### Functional and Timing accuracy of an RTL Model

I am sometimes really confused by the abusive use of jargon in EDA/VLSI design articles and books. With no precise definitions, its upto the reader to make interpretation which is very ambiguous and ...
6 views

### Can a DC motor be of specification 320Watts, 3A, 24 V?

Hi the above is the specification of a wheelchair DC motor im trying to use as my hobby project. My doubt is how can a motor of 320 Watt and ...
27 views

### Recreating a missing wireless keyboard dongle with NRF24L01

I have found an old Logitech Wireless Keyboard (specifically, the MK250 model), which was originally sold with a separated "standard" 2.4Ghz receiver dongle (Not 'Unifying', as written here). I assume ...
76 views

### How should I solder one board to another?

I have a small power regulator/charger and a IOIO-OTG that I'm trying to solder onto my protoboard. My current idea is to use male/male headers. Is there another way? What is the best practice when ...
33 views

### Building a NFC extension Antenna

I'm trying to find out how to build a circuit to extend the NFC range. NOT the range from the chip itself, but like following example: I have NFC enabled Tablet that has an built-in NFC chip. I ...
52 views

### FPGA based theremin , is possible?

I remember a while ago , i saw some Digital based Theremins circuits from glasgow university... http://www.theremin.info/-/viewpub/tid/10/pid/65 would it be possible to make a theremin by using an ...
28 views

### Photodetection related circuits [on hold]

our professor said that for driving a photodetector, we need some related circuit such as filters, lockin amplifier, preamplifier,readout ,... does anybody know that what is readout circuit and it's ...
23 views

### Equivalent circuit of a three phase induction motor

So, i know that a equivalent circuit of a single phase of a three phase induction motor is just like a transformer equivalent circuit when it is at standstill. When, however, it is rotating the ...
48 views

### Voltage notation changes [duplicate]

I've noticed here, lately, that there seems to be a growing trend to substitute "U" for "V" in, for example: $$\ Q= {C\times U}$$ Why is that?
40 views

### How to estimate max current draw from an unknown PSU? [on hold]

I have a couple of PSU boards from Sony PS2 consoles. They convert 230VAC to 12VDC and would be useful in a couple of my future projects. Unfortunately there's no information how much current they ...
32 views

### Bus pirate interface with with winbond chip

I have successfully interfaced to my winbond chip via the bus pirate. I have successfully executed the chip identifier command and chip erase commands via spi, i would like to read and delete the ...
8 views

### Trying to use BC417 bluetooth with LM4F232H5QD Evaluation Board

I am new to embedded. I am using STELLARIS LM4F232H5QD Evaluation Board. I want to get data from this board using bluetooth. And i have ...
120 views

### Is electronic an exact science? [on hold]

Whenever I read or watch any video tutorial about electronics most often it is said that electronic is not an exact science. But what I feel is if it is measurable then it should be an exact science. ...
119 views

### Finding the voltage and charge across capacitor

Can someone help me find the voltage and charge across each of the capacitors? This is not just a simple/ parallel circuit so I am having a problem in formulating the right equation on how to find the ...
18 views

### MCP23017 not causing interrupts using a normally open switch on power up

I'm working on a project where I am using two 4x4 button pads. I would need to use two MCP23017 for input interrupts to support the 32 buttons. I am using a Netduino and I'm coming across an issue ...