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I think that is not quite true, but it is one of those "surprises" that you may not have realized was there. The LTwiki ( here (

On 14/04/2025 23:03, Kendall Castor-Perry via groups.io wrote: > Hi all - anyone seen or been bitten by this?? I'm working on a middling-sized circuit, nothing fancy, all passives and library ADI

Thank you, but that crazy filter is not my design.

The "annotate steps" is in the "notes and annotations" menu you get after right clicking in the results menu after a successful step'd simulation. Cheers Ian

Hello John, The land of dB can be confusing at first.? When dB was invented, it was a way to keep track of power, as in watts.? Each +10dB was 10 times as much power. Recall that power, P = V^2 /

Hi all - anyone seen or been bitten by this?? I'm working on a middling-sized circuit, nothing fancy, all passives and library ADI opamps, inamps and diff drivers.? Implementing a little gain and

This is very OT, but dBm is very widely applied to 50 ohm circuits in the RF field. -- This email has been checked for viruses by AVG antivirus software. www.avg.com

No, it's not. dBm applies only to 600 ohm circuits. If you want independant on load, you must use dBu (or dBV).

To be very precise, 0.775 V is approximately *equivalent to* 1mW in 600 ohms, which is sqrt(600x0.001) = 0.774596... That is the explanation of the voltage value. -- Best wishes John Woodgate RAYLEIGH

Bruce: https://en.wikipedia.org/wiki/DBm In audio and telephony, dBm is typically referenced relative to the 600-ohm impedance[4] commonly used in telephone voice networks, while in radio-frequency

0 dBm is 1mW independent of the load resistance. Bruce

Actually, 1Vac is meaningless. Could be 1V rms, 1V peak or 1V peak-to-peak. The dB value is always referred to the input voltage, whatever the unit. In order to have the results expressed in dBuV, the

John Woodgate: 0 dBU is not 1mW in 600 ohms. 0 dBU is 0,775 V irrespective of impedance. 0 dBm is 1 mW in 600 ohms. -------------------- Best regards, Goran Finnberg The Mastering Room AB Goteborg

FYI - not a bad idea to use a custom, *small* symbol for a 0 V voltage source, to use either as an ammeter or a net isolator.? Other group members did that already.? Easy to make your own.? Of

There are dynamic range issues with very small resistors. Pre-LTspice, I saw simulations with very small resistors where voltages drifted a few volts beyond the supply rails. Andy

Because a zero valued voltage sources' behavior is basically transparent to the simulator. A small valued resistor in not. It still exhibits behavior in the circuit as resistor and could affect high

dBu? is decibels referred to 0.775 V, which is 1 mW in 600 ohms. dB?V, or better dB(?V), is decibels referred to 1?V. -- This email has been checked for viruses by AVG antivirus software.

Why not? -- This email has been checked for viruses by AVG antivirus software. www.avg.com

Hello Ray.Koo, Since you are looking for attenuation characteristic of the filter,? your base reference is immaterial. Namely it could be dB with respect to any value... say boiled but not peeled

Hi I have two "jumpers" in my library both made from a single zero voltage source. One has a "shorting link" graphic. One has a "current probe" graphic. I don't recommend the use of tiny valued