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Results found
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closed
-1
votes
1
answer
101k
views
Why does Samsung mobile phone batteries come with a chip-like paper? Are they spying on us? [closed]
Yesterday I saw a WhatsApp message. In that, one person is showing the Samsung phone batteries.
He removes the wrapper and takes out the black color thin paper or plastic sheet which is attached with …
0
votes
1
answer
148
views
connecting a GSM booster directly to a mobile device? [closed]
I live right on the edge of mobile reception. I just get a signal with an external antenna, but it is weak. I am thinking of getting a small indoors GSM booster, like this.
I was wondering if it migh …
- 640
-1
votes
1
answer
439
views
How to make 20 LED's light up one at a time and remain on, and then power off one at a time? [closed]
I’m looking to see if there is a circuit I can build that would light up a row of about 20 LED’s one at a time after pressing a button, and keep those LED constantly on once there were activated. Fina …
- 19
0
votes
3
answers
2k
views
Can (or should) two voltage regulators be connected in a parallel configuration. [duplicate]
I have two 5 volt voltage regulators that I would like to connect to a 9 volt source in a parallel configuration. Is this advisable, problematic, or even commonly done?
I have tested this configur …
- 565
0
votes
4
answers
10k
views
Troubleshooting PCB of an ATX power supply? [closed]
Im new to PCBs, know the basics of electronics and testing of individual components. I have a PCB (of an ATX supply) that is not working when I power it, so I thought of testing each components like r …
- 197
0
votes
1
answer
3k
views
Passive audio phase shifter (180°) - can it be done? [closed]
I understand that most analog hardware phase shifting circuits seem to use OpAmps to get their job done.
I am trying to build a tiny, non-powered in-line adapter for Mp3-players and such to quickly su …
- 183
0
votes
1
answer
14k
views
Name of the Samsung Galaxy end of charger [closed]
This is probably a weird question to ask but I am looking for the end "jack" of the Samsung Galaxy S3, S4 etc charger name. Is not the USB side of the cable, is the actual bit which goes inside the ph …
- 13
-2
votes
1
answer
427
views
Lift the FB pin of buck regulator [closed]
I have a basic buck regulator with feedback control. \
If I open feedback pin of the regulator (example lift the FB pin), then the regulator will be damaged. Why ?
Regards,
Azlum
2
votes
1
answer
101
views
Using a radio board with Contiki-OS on lpc1347 mcu [closed]
I am trying to build a port for Contiki on my lpc1347 board. So far I have been able to run a basic LED blinking/Hello_World Contiki process/program on my board. My next goal is to use a cc2530 radio …
- 165
0
votes
2
answers
84
views
Rotating a motor according to calculated output [closed]
I have 13 photodiodes. Positive connection from battery is connected to the positive end of each photodiode. The position of photodiodes is as shown below:
o o o
o o
o o o
o o
o o …
- 203
-2
votes
1
answer
80
views
oDevice to measure power available from charging point [closed]
When charging, I know that USB socket that you plug your microUSB cable into will charge your device at SOME rate. But that rate varies wildly, depending on the original source of the power (high qual …
- 97
-1
votes
1
answer
206
views
PIC18F25K80 and WiFi [closed]
I want to send information over wifi from my PIC to PC. I need some basic tutorials or guides on this topic. I have searched online but there is no tutorial that starts from the basic. Can anyone guid …
- 83
0
votes
1
answer
572
views
adapter replacement for 12V 0.5A [closed]
Can I use a 12V DC 1.0A adapter in place of a 12V DC 0.5A adapter for my piano keyboard? The keyboard comes with a 12V DC 0.5A adapter but it is lost. I found a 12V 1.0A and wanted to know if it can b …
-1
votes
1
answer
523
views
8-bit Serial I/O Parallel I/O Bi-Directional Shift Register [closed]
I am looking for a register that has as stated Serial In Parallel Out and Parallel In Serial Out modes and bi-directional shift functionality all in one IC. I want to use it with Arduino. Does somethi …
- 109
1
vote
1
answer
2k
views
Depletion-mode P-channel MOSFET availability? [duplicate]
I need a P-channel depletion-mode MOSFET for a circuit I'm building. However, there is no model available in LTspice that I have found, nor is there any available that I have found to buy online.
Ho …
- 737