Unanswered Questions

11
votes
1answer
348 views

AT Commands to transmit data through TCP/IP stack with LTE network

I need to design an embedded sotfware that will drive a LTE cellular device (like u-Blox TOBY L2 Series) and its TCP/IP stack to transmit some data toward a distant server. I'm waiting for the device ...
6
votes
0answers
624 views

Trifilar Transformer Common-Mode Rejection Circuit (Signal Recovery, Hybrid Combiner, RF)

I'm trying to develop a circuit that allows me to effectively subtract two different sources of RF noise from a single signal at the same time. I am planning to use something called a "trifilar" ...
5
votes
2answers
789 views

How to implement critical sections on ARM Cortex A9

I am porting some legacy code from an ARM926 core to CortexA9. This code is baremetal and does not include an OS or standard libraries, all custom. I am having a failure that appears to be related ...
5
votes
2answers
114 views

How were Ben Franklins “positive” and “negative” assignments passed down through the years?

I've spent quite a lot of time now researching what I can find online about the story of how Ben Franklin assigned the terms positive and negative to what had previously been called vitreous and ...
5
votes
0answers
80 views

Problems while trying to flash a memory using openocd and jtag

I'm using openocd and jtag for the very first time in my life (after 30 years of playing with electronics), when I dump the flash using dump_image, I got a 4 byte sequence (0x80 0x01 0x59 0x18) in ...
5
votes
2answers
213 views

Does the Y-Δ transform suffice for every resistor network?

Suppose I have a (finite of course!) network of resistors only. Is it always possible to calculate the equivalent resistance between any two points using only parallel, series, Y-Δ and Δ-Y (wye-delta ...
5
votes
4answers
165 views

How to power off a dual supply op amp?

What is the best way to power off a dual supply op amp (LM741)? Should I cut the positive, negative, or both? Thanks! I’m building an audio oscillator using four op amps, and I’d like to be able to ...
5
votes
1answer
301 views

what is the meaning of the star on inverter gate?

there is an star sign on the inverter gate in my homework circuit. what is the meaning of it? what is the difference between it and a normal one?
5
votes
2answers
169 views

converting induction motor winding to reluctance motor winding

I want to build simple reluctance motor for education purpose. I have couple of small 3 Phase AC Induction motor with 24 slot stator lap winded for 4 pole design. I want to convert it to reluctance ...
5
votes
2answers
214 views

motorcycles and vehicle ground loop detectors

I have been asked if it is feasible to make a motorcycle accessory that will trigger the traffic ground loop antenna sensors that typically fail to register the motorcycles presence. Reading up on ...
5
votes
2answers
559 views

32-bit unsigned binary integer to 8-bit BCD in AVR ASM for ATtiny. How to make it more efficient?

I wrote a program in AVR ASM for converting 32-bit unsigned binary numbers to 8 digit ...
5
votes
0answers
223 views

Typical zero sequence data for 80MVA transformer

I need to model a 80MVA transformer 132/33kV built in 1973. There is very little information on this transformer but I need to populate certain values in the model. Where can I find typical zero ...
5
votes
2answers
812 views

Trouble with first part of Experiment 11 (Make: Electronics)

Experiment 11 from Make: Electronics Hi, this'd be my first forum post. I'm really out of options here. Let me get straight to the point. I bought the book "Make: Electronics by Charles Platt" a ...
5
votes
3answers
965 views

Charge Model vs Voltage Model for Piezo Electric Sensor

The following document describes signal conditioning circuits for Piezeoelectric sensors. I was interested in knowing which model should I use when designing signal conditioning circuit for ...
5
votes
3answers
15k views

Broadcast audio to multiple receivers via Bluetooth

I want to be able to connect multiple Bluetooth devices to a Bluetooth transmitter, and then stream audio from a portable MP3 player, via Bluetooth, to all of the connected Bluetooth receivers. Is ...

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