All Questions
0
votes
0answers
14 views
Low power wireless receiver that makes sound
I want to make a device that works in same frequency range of home appliances. And less distance range would suffice (15 meters or so). My question has two parts
I want to make a low power receiver, ...
0
votes
0answers
16 views
XBee 900Mhz Range analysis
According to that module http://www.digi.com/products/wireless-modems-peripherals/wireless-range-extenders-peripherals/xbeedigimeshadapters#specs
The power consumption is about 1.5Watts. Where is the ...
2
votes
0answers
12 views
What ferrite for Ethernet Phy?
I'm using a Micrel KSZ8051 Phy in a 100mbps design. The datasheet specifies that it should have a small ferrite bead feeding the power.
However, the datasheet doesn't suggest any specifications for ...
0
votes
0answers
15 views
Spice definition of resistor/capacitor
I am trying to understand a Spice definition of a circuit and transient analysis on it. I have kind of "inherited" this and can't ask the original creator; my Spice memories from university are pretty ...
-1
votes
0answers
19 views
ADC with STM32F3
In the RM0316 reference manual of STM32F302xx, STM32F303xx and STM32F313xx advanced ARM-based 32-bit MCUs i found in the paragraph 12.8 - Dual ADC modes
In devices with two ADCs or more, dual ADC ...
0
votes
1answer
33 views
How to choose the right earphone?
Based on my study, I found that there are two different type of positioning the contact for the 3.5mm audio plug, and it is depend on the manufacturer (ex. handphone manufacturer). The difference is ...
0
votes
1answer
27 views
Signal level shifting from +-15 to +-25
I have a bipolar signal with a peak to peak voltage of 30V (+-15V). I need to shift the signal level to be (+-25) with a dual supply voltage rails of (+-25). Do you have any ideas or a circuit ...
1
vote
1answer
36 views
Typical minimum silkscreen-pad spacing
What is a typical industry figure for the minimum spacing between silkscreen and pads? When I look at a manufacturer's general list of capabilities, sometimes this number isn't even listed. I haven't ...
2
votes
2answers
51 views
What is the sensor name and use and circuit diagram for Current TV will be used based on Body parts movement?
I want to know more about the Sensor which are used nowadays in the TV and Laptops we can access the functionality by moving our body parts. also used in Game play in Playstations, Laptops to change ...
1
vote
1answer
70 views
How can I detect brain waves
I want to build some type of electrical circuit to detect alpha, beta , theta etc. waves from the brain and maybe even show the frequency in hertz . Or at first, generate a higher power wave for my ...
0
votes
2answers
29 views
Reading Voltage NTC Sensor, Unexpected Behaviour
Below pictured is the basic circuit im working with, NCT is apparently pretty much a variable pot resistor.
The measuring point ive added. According to the manual for my car, the sensor is provided ...
7
votes
2answers
48 views
Which sensor to use for detecting nylon string vibration?
I need to detect motion on a nylon (transparent) stringed instrument.
When the string is plucked, it would vibrate and I'd like to know what kind of sensor to use in order to detect the action.
...
0
votes
0answers
46 views
Build a complete custom Bluetooth device given a specification [on hold]
I am a Software Engineer and I have one project idea for mobile devices. This idea involves communicating with a Bluetooth device.
I would probably spend long time if I need to get in to the details ...
1
vote
1answer
39 views
ARP message to enc28j60
I have made the driver for enc28j60 for LPC1788 and I'm trying to send UDP message to LPC via wifi enabled device (iOS, windows over wifi). But transmission fails. Wifi device sends the ARP request. ...
1
vote
0answers
44 views
Optoisolator not outputting (DC switching)
Trying to reset, automatically, an HVAC speed control unit. The unit has an output pin H8 that goes to 24VDC when tripped, and 0VDC when running. There is no reliable ground pin (or other ground) ...
