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I must be thick, but I don't understand how in examples 2 and 3 DC can "add" as you state.
I thought when you have a current each flowing in an opposite direction in two adjacent conductors, the currents oppose, cancel, and there is no resulting magnetic field.
If so, in example 2 AC and DC...
Thank you for explaining further. I will consider the question solved and another lesson learned. But what do CM and DM stand for?
And is it possible to have a case where AC adds and DC cancels?
I had a rethink on my previous post, and was wondering why the DC in 2 and 3 would add given the they are moving counter to each other in adjacent conductors. Does this not imply cancellation?
Yes, I did want to look at AC and DC separately since the device is a kind of "transmitter", and dealing with them differently is the purpose of the different antenna configurations.
Based upon the last two replies, I have summarized below to the best of my understanding. Please refer to...
At your suggestion I have included a drawing of the three examples of interest. Let's assume a 100Hz 2Vpp signal and all load resistance in the coils.
In the new examples 2 and 3, I have put a DC offset on the signals. In 3, one signal is inverted.
As previously stated, I am trying to...
Thank you for your concise reply. The problem appears simpler than I first thought.
However, I point out the in spite of the voltages of the signal and its inverted copy adding in example 2, the currents of each oppose since each signal is fed in from a different end of the wire pair. Does this...
Thank you for your explanation. Due to my lack of experience, I had a bit of trouble following some parts.
I should also mention that my orientation is not EMI prevention but rather to experiment with low E and H field frequency transmitters. Hence I am interested in the emitted field itself...
I would like to know what the electric and magnetic field topology is for the following conditions relating to parallel conductors, "A" and "B".
All signals are identical except for phase and point of connection.
A1 __________________ A2
B1 __________________ B2
1. In phase signals applied to...
I like Brad's revised LM555 switcher and will give that a try.
The LM4775 idea looks interesting as well. I happen to have a few 10W amp modules I bought as kits on the internet which are looking for work.
https://www.quasarelectronics.co.uk/kit-files/electronic-kit/3143.pdf
I can...
This morning I built the transistor buffered VGND supply shown in my first post. Everything looked good until I connected the amplifier circuit. The positive rail rose to 17VDC while the negative dropped to 7VDC. Only 34mA was being drawn from my lab power supply set at 24VDC, and both amps, one...
It looks like no one so far is that keen on the regulator-based circuits previously referred to here. https://www.goldpt.com/virtual_ground_circuit.html
I will go with Brad's switching circuit above and breadboard it.
There is still the issue of 16VDC being the maximum allowable supply voltage...
Thank you. That was an interesting thread. But it appears the OP's question was not resolved to the point of arriving at any particular design.
I am looking for a similar "simple" solution that does not require design of a switching power supply or the use of inductors. Perhaps an op amp in...
I am looking for a circuit design that will produce, from a 24VDC 2A regulated plug pack (SMPS wall wart), +/-10VDC rails with a virtual ground midway. Each rail needs to be capable of providing 1A continuous, or as close as practical.
I would prefer not to build a switching supply, use two...
Thank you for pointing that out, but the circuit does work as drawn in my most recent diagram, and was verified on my scope. In fact, I noticed it even works when pin 3 of U2 is not connected to anything. So there must be something else going on other than what you suggested. Perhaps your...
I have corrected my mistake with the inverting buffer U1 and added a bit more gain to the second op amp U2 with a 220K feedback resistor. Pin 8 of U2 remains connected to ground. I tested the circuit on the bench and it works well. 1Vpp in and a maximum output swing of -1V to -9V. The 10K pot...
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