Unanswered Questions
1,392 questions with no upvoted or accepted answers
4
votes
0
answers
74
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Controlling device with Raspberry PI with different power supply
I want to control USB switch selector with Raspberry PI(RPi).
The switch (amazon) have an external wired remote with micro button and couple of LEDs.
I need to emulate a button press and ideally ...
- 41
4
votes
0
answers
62
views
Power Circuit for TB9051FTG Trace Width
I am working on a PCB with a Toshiba motor driver chip, TB9051FTG.
https://www.digikey.com/en/products/detail/toshiba-semiconductor-and-storage/TB9051FTG-EL/10123940
The datasheet mentions the ...
- 145
4
votes
0
answers
61
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Disk array power supply pinout/conversion
Sorry for crossposting this, but I've had no answers from the more specific Ggroups.
I'm in the process repurposing a power supply from a scrapped Sun Microsystems StorEdge D2 array which was working ...
- 53
4
votes
1
answer
152
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Sensible way to power an OLED display from AAA Cells
I'm designing a small battery powered device and I want to use an SSD1327-based OLED display. Unlike the SSD1306, this one doesn't appear to have an integrated boost circuit to power the panel, which ...
CommunityBot
- 1
4
votes
0
answers
1k
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Deriving PI controller transfer function when input is reversed
I'm developing the compensator for the linear DC Bench Power Supply I'm
designing.
As I've come to deriving the transfer function for the op amp-based
compensator, I realize I've been depending on a ...
CommunityBot
- 1
4
votes
0
answers
175
views
High Frequency Ferrites for Transformers
There are many Ferrite material grades Available.The optimum frequencies start around 20KHz and extend well into the MHz range.There are also many core sizes to go from watts to Kw .Planar cores are ...
- 15.2k
3
votes
2
answers
330
views
Increasing amperage of HP AC-063-2 A power backplane
The HP Proliant DL180 G6 has a power distribution board/backplane AC-063-2 A P/N 515766-001 with limits specified in the picture....
CommunityBot
- 1
3
votes
0
answers
652
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Home automation using CAN bus
I am planning to make a prototype for wired home automation devices, and I am thinking of using CAN bus for communication between nodes and Gateway.
The way I am planning to build it, there is one ...
Null♦
- 7,623
3
votes
0
answers
171
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Estimating beat frequency amplitude caused by non-synchronized downstream buck converters
I was reading a TI app note “Synchronizing DC/DC Converters in a Power Tree” which showed how subharmonics appear on the input voltage line when it powers two buck converters with different switching ...
- 9,270
3
votes
0
answers
344
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What could be burning the schottky diode in this synchronous rectifier?
I have this TV PSU which has one supply circuit for the TV motherboard, which it calls "standby" in the scheme (AO3).
Here's a portion of the AO3 circuit where most of the components I'll ...
- 761
3
votes
0
answers
422
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Adding an adjustable constant current option to a LM5175 circuit
Disclaimer: I'm no electronics engineer and I have no experience in this kind of circuit! I do occasionally design simple analog circuits and PCBs, barely messing with opamps.
Context:
I'm about to ...
- 131
3
votes
0
answers
1k
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TP4056 and ST32F103C8T6 shorting after few uses
Complete schematic:
Top part:
Lower part:
This is the circuit schematic, top part is sensor, bluetooth, microcontroller, oled and pins related all working from 3.3v coming from regulation of a ...
3
votes
0
answers
239
views
Help identifying component in SMPS
I have been working on a Schroff/Cherokee Europe PE1947/23B SMPS (circa 2004?) and have had trouble identifying a component within the circuit.
This SMPS features the following outputs:
+12v DC @ 8A
...
- 218
3
votes
0
answers
196
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How do airplane in-seat power detection circuits work?
Airplane in-seat AC line-voltage power outlets have limited available current/power. I remember reading that laptops or laptop power adapters can somehow detect this and inform the laptop that it ...
- 175k
3
votes
0
answers
226
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Power Supply Nixie tubes (IN 9)
I am in big trouble with my power supply for Nixie tubes (IN 9 bargraph.)
I need 140V -160V (150V prefered) output voltage and 10x 12mA --> ~140mA current. (~ 21W).
I tried to design boost ...
