Author: Math Dev

Email address which forwards to my Google Voice SMS inbox

Post author By Math Dev
Post date April 3, 2020
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NOTE: This question intentionally replicates What SMS email address works for Google Voice? But that is 8+ years old, and the accepted answer does not apply. I guess it would be misleading to place a bounty on that question, users will not understand the “history” of the post. I have a Google Voice number XXX-XXX-XXXX. […]

Tags and the accepted answer does not apply. I guess it would be misleading to place a bounty on that question, it used to be something like posted 10 years ago: Web application to send SMS email, NOTE: This question intentionally replicates What SMS email address works for Google Voice? But that is 8+ years old, users will not understand the "history" of the post. I have a Google Voice number XXX-XXX-XXXX. How can I "build" an email address such that

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High side mosfet turn off pulse

Post author By Math Dev
Post date April 3, 2020
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I am making a 3 phase motor drive H-bridge using N channel mosfets (IRFB3607) and BJT based custom mosfet driver such that my turn on and turn off time is about 200ns. Right now I am testing the system with a light load of 0.5A at 24V. So during turn off, I see something interesting […]

Tags I am making a 3 phase motor drive H-bridge using N channel mosfets (IRFB3607) and BJT based custom mosfet driver such that my turn on and tur, I see something interesting that I can't explain. Yellow- Output Blue - Gate Red - (math) = Blue - Yellow The differential signal says th

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Is it possible to light a led bulb with AA battery

Post author By Math Dev
Post date April 3, 2020
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Total novice to eletrical engineering. Is it possible to light a led bulb with AA battery What are the factors to consider here. example resistance, consistent power supply. … Why does a short circuit happen if a single led is plugged directly to wall socket

Tags consistent power supply. ... Why does a short circuit happen if a single led is plugged directly to wall socket, Total novice to eletrical engineering. Is it possible to light a led bulb with AA battery What are the factors to consider here. example res

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How to use electricity in agriculture?

Post author By Math Dev
Post date April 3, 2020
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How to use electricity in UP Agriculture? I cultivate so what steps can be taken to control the temperature of the land? I want to increase the heat with the help of a bulb.

Tags How to use electricity in UP Agriculture? I cultivate so what steps can be taken to control the temperature of the land? I want to increase

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Minimum EAGLE trace width for PCB etching with glossy paper and a cloth iron

Post author By Math Dev
Post date April 3, 2020
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What`s the minimum widht and clearence that’s etchable using a photo paper and an iron? I’ve heard using too small clearence might mess the ink resulting in shorts. I want to have 20V@400mA, will 8mil of width and clearence work for such voltage and current, and will it be etchable?

Tags and will it be etchable?, What`s the minimum widht and clearence that's etchable using a photo paper and an iron? I've heard using too small clearence might mess the i, will 8mil of width and clearence work for such voltage and current

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SIM800L Auto Connect..!

I want to know does the SIM800L module connect to the network automatically without any user commands? Because some modules will disconnect in low signal areas & some SIMs will be disconnected by service providers until we pay the monthly bills. I do not set or poll any network related commands on power up, I […]

Tags I just set some SMS commands & Echo off only.The modules works nicely on workbench but not sure above will happen in one day...!!, I want to know does the SIM800L module connect to the network automatically without any user commands? Because some modules will disconnect

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How to determine what battery to use?

Post author By Math Dev
Post date April 3, 2020
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I am making a project that requires two different voltage levels, 5V and 12V (although this can be lowered to 7V minimum). I have two voltage regulators as described by the schematics below: I want to have one power source that can supply enough current and last a decent amount of time to power both […]

Tags 5V and 12V (although this can be lowered to 7V minimum). I have two voltage regulators as described by the schematics below: I want to have, I am making a project that requires two different voltage levels, so technically I can get away with just two batteries in series or maybe two sets of two in series and those sets in parallel to get longer b

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Can I resolve a spice netlist to determine what parts I need?

Post author By Math Dev
Post date April 3, 2020
No Comments on Can I resolve a spice netlist to determine what parts I need?

I have used hierarchical schematics in my design, so I can’t really “see” anymore what’s going on behind the scenes. I want to figure out how many of which parts I need… I figured that perhaps the easiest way to do this was by looking at the netlist. However, the netlist includes subcircuit definitions, so […]

Tags and there is an even easier way to do this?! Thanks for your help!, I have used hierarchical schematics in my design, if this is my netlist: V1 N001 0 12 XX1 N001 N002 CIRC1 XX2 N002 0 CIRC2 .SUBCKT CIRC1 A B R1 A P001 10k R2 P001 P002 100k R3 P002 B 10k .EN, it doesn't come up with the right number. Is there a way to resolve a netlist to get rid of the subcircuits? For example, so I can't really "see" anymore what's going on behind the scenes. I want to figure out how many of which parts I need... I figured that per, so if I do a search in a text editor for the model name, the netlist includes subcircuit definitions

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What type of capacitor do I need to stabilize USB voltage?

Post author By Math Dev
Post date April 3, 2020
No Comments on What type of capacitor do I need to stabilize USB voltage?

I am trying to use a “FET” (https://elinux.org/RPi_GPIO_Interface_Circuits#Using_a_FET) to switch the power supply to a USB speaker from my Raspberry Pi. It’s working well, however when I turn the volume to greater than 60%, the speaker plays a sound but then dies and disconnects, only to reconnect via USB 2 seconds later. I’m thinking that […]

Tags but I'm not sure. I'm using the NTE2987 Logic Level MOSFET N−Channel and a 100k resistor to switch the USB ground, however when I turn the volume to greater than 60%, I am trying to use a "FET" (https://elinux.org/RPi_GPIO_Interface_Circuits#Using_a_FET) to switch the power supply to a USB speaker from my R, just as described in the above link. I've tried to use multiple 100uf capacitors to "smoothen" the voltage, only to reconnect via USB 2 seconds later. I'm thinking that the voltage is probably dropping too much, the speaker plays a sound but then dies and disconnects, with no effect. Appreciate advise on how I can make this work!

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Can I use SFP+ like just data cable?

Post author By Math Dev
Post date April 3, 2020
No Comments on Can I use SFP+ like just data cable?

i’m using zc706 (xilinx) eval board. I want to connect ZC706 and custom board for transcevier. The zc706 board has SMA, SFP+ connector for GTH trancevier. Can I use SFP connector for just cable with using only tx/rx pin like figure below (molex 74441-0010)

Tags i'm using zc706 (xilinx) eval board. I want to connect ZC706 and custom board for transcevier. The zc706 board has SMA, SFP+ connector for GTH trancevier. Can I use SFP connector for just cable with using only tx/rx pin like figure below (molex 74441-0010)