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5 votes

When do we need 1500 mA current to drive LEDs?

It would be better if you could find a source that provides better technical details than amazon, as I would be very hesitant to trust that. But, there is a way that you could design the led circuit ...
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3 votes

Is an op-amp's output current limited by the supply (+/- Vsupply)?

The output current is only ever supplied from the Vsupply pins. Any input current that flows is tiny, and unrelated to the output. The nA-level bias currents that flow eventually end up in the supply ...
  • 145k
3 votes
Accepted

When do we need 1500 mA current to drive LEDs?

I googled and found the higher resolution images from Amazon. If you look closely, all 10 LEDs are directly in parallel, and then those 10 are in series with the next ten: This design maximizes the ...
  • 11.1k
3 votes

When do we need 1500 mA current to drive LEDs?

It's very likely to be a series/parallel array of LEDs. It works because all the LEDs come from the same batch and so will be reasonably closely matched. It won't be exact, but an array that size ...
  • 15.6k
3 votes

Current flow in non-inverting op-amp amplifier

Assuming it's an ideal op-amp so no current flows into the op-amp terminals and V+ = V- = Ve. So, current flowing through R3 is 0. Current through R4 is Ve/R4. Apply voltage divider to get node ...
2 votes

Cooling a wire to increase its current rating and lifespan

Answering your original question, a typical way of cooling coils is using mineral oil. It can not only refrigerate the bobbins but also eliminate corona discharges and act as a general insulator. An ...
2 votes

Is an op-amp's output current limited by the supply (+/- Vsupply)?

V+ and V- are power supplies of the Op-amp. They define the transfer function which determines what positive or negative levels of output voltage swings the Op-amp can have. If you reduce these ...
  • 103
1 vote

Is an op-amp's output current limited by the supply (+/- Vsupply)?

I'm unsure if that's from the +/- Vin or the +/- Vsupply The power is supplied to the op-amp. +/- Vin are used to "control" the "power" of supplies. Op-amp release the "...
  • 7,171
1 vote
Accepted

How to buffer an AM signal?

Here's is a simple AM modulator. The amplitude of the 1 mhz carrier wave is from -2V to 2V (simple AC signal generator). The amplitude of the audio signal (simulated as a 1 khz AC source) is from -1V ...
1 vote
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Current flow in non-inverting op-amp amplifier

There are a couple of points that make things much easier: Current doesn't flow into or out of the op-amps inputs, because they have infinite impedance. It's as if the op-amp isn't even there. With ...
  • 10.4k
1 vote

Cooling a wire to increase its current rating and lifespan

In order to ensure that the heat generated by the wire does not exceed the heat generated from nominal operating current, use this formula: \$A \sqrt{D} \lt A_0\$ A ≡ pulse current (80A) D ≡ duty ...
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1 vote

Cooling a wire to increase its current rating and lifespan

An interesting solution would be if it is not continuous you can use paraffin wax, during phase change it has a the ability to absorb a lot of heat. The heat of fusion of paraffin wax is about 90 - ...
  • 3,676
1 vote

Source-free, under-damped, parallel RLC with 2 intial conditions

You folks know most of what I will write and at the risk of being pedantic ...: The target is some knowledge about "\$B_{1}\$ and \$B_{2}\$" in: $$v(t)=e^{-\alpha t}[B_{1}cos(\omega_{d}t)+B_{...
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