T&L Publications

The load is 15 ohms at 120 Volts and 12 amps DC.

Does not compute!

120V / 12A = 10 Ohms

Or, if the 15 Ohms is correct, then 12Amps is wrong; like JWax said.

I have never of anything needing 110VDC at 12 Amps. (probably why no vendor makes one)

And not safe unless isolated from mains.

What is the load?

How are you regulating the output to 110VDC? The peak of 110VAC is 155V. At no load that is what the filtered DC will be. As load current increases, output ripple voltage increases as the filter capacitor supplies the current between the input voltage peaks. The input current is zero till the input ...

Not getting 10mA (max) into a load is a problem. It looks like IC fails in this respect.

Getting a smaller short circuit current is a good thing. Why are you worried that? When output voltage is forced to zero (by short) the IC probably limits the current so it does not destroy itself.

Where are you seeing 27mA in the spec.

Last item in specs for each part number. In this case on page 5 of 24. And resolved subject line problem in post 2.

Now I missed a line on spec sheet - Load Regulation, Conditions column; which shows 0ma to 10mA.

Where did you get the IC? Discount places sell parts that failed some test but still function.

The spec sheet title is ADR421. The "BRZ" on your parts might mean low power. A 1k load is a ridiculously heavy load for a precision reference. It is not a power supply regulator. -------------------------------------------------------- Yes, probably not oscillating. Did you place 2 small capacitors...

The spec sheet I'm looking at https://www.analog.com/media/en/technical-documentation/data-sheets/ADR420_421_423_425.pdf says 27mA is typical, not minimum. There is no minimum. So, the IC you got limits to a lower current to protect itself when a short is detected. A short is an error condition. Why...

Nonsense, he said non equal current rated breakers.

And even if they were equal breakers, and the wires were just large enough not to overheat, they are not a load balance resistor.

The resistances of the breakers is not directly related to current ratings. So, for example, with a 60A load the 15A breaker may pass 20A. The 15A breaker will trip. That leaves the 50A breaker with the whole 60A, it will trip too. Equal rating, same part number breakers will share the load more eve...

Please read the posts before answering! This discussion was about towers on insulators. Which means RF hot tower. A hot tower needs a spark gap for lightning protection without shorting the signal. My mention of spark gap a couple posts back was for hot tower, obviously a non-hot antenna support tow...

The tower you say is 600ft not 2000ft. It supports other antennas so is unlikely insulated at the base. The mountain it is on is not relevant.

The big tube likely is waveguide, or coax.

A 1/2 wave antenna for an AM broadcast station could more than 400 ft.

(is 2000ft an over estimate?)

Electron flow, outside the source - electrons flow from the negative terminal through the external circuit to the positive terminal of the source. Inside the source the electrons are forced toward the negative terminal. The extra electrons at the negative terminal is what made it negative in the fir...

Active filter? If yes, what cutoff/rolloff of the amplifier?

(images didn't work - had to ask)