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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

That’s what I am using… Sent: Sunday, April 13, 2025 2:45 PM To: [email protected] Subject: EXTERNAL: Re: [LTspice] Creating a dirt-simple subcircuit component You can use a 0 Volt source as a

You can use a 0 Volt source as a jumper. This allows differen netnames on each side with 0 vols difference across the source. My distribution has a jumper2 symbol which is not a sub-circuit, but a

You can have zero ohm resistor in LTspice, but it doesn't do what you might expect. If you use one, LTspice just ignores the symbol and the netlist shows that it replaced the resistor with a wire, so

Yep! I don’r really like the Jumper symbol, so made it one as a resistor-sized box, marked “0 Ω” Sent: Sunday, April 13, 2025 11:32 AM To: [email protected] Subject: EXTERNAL: Re: [LTspice]

You cannot have a zero-ohm resistor in LTspice.? I've created a jumper with a 1f ohm resistance called MyJmpr.? The simple subcircuit is assigned it to the original jumper symbol and saved as

SO, no need to include the file name in the symbol Attributes editor? Sent: Sunday, April 13, 2025 11:22 AM To: [email protected] Subject: EXTERNAL: Re: [LTspice] Creating a dirt-simple subcircuit

No Prefix. Andy

What "linkage"? The filenames (minus the .ext) must match.? That's all the "linkage" you need. Andy

OK: Erased prefix “X” Have ZeroOhm OR ZeroOhm.asc in SpiceModel line All works fine. Thanks! Dave Sent: Sunday, April 13, 2025 11:11 AM To: [email protected] Subject: EXTERNAL: Re: [LTspice]

I did. Ah! What prefix, then? And still, where do I insert the linkage to ZeroOhm.asc? Sent: Sunday, April 13, 2025 11:11 AM To: [email protected] Subject: EXTERNAL: Re: [LTspice] Creating a

Create the symbol from the schematic (.asc) file! Must not have Prefix = X. Andy

If that weird design works for you, OK. This group doesn't do circuit design, but if you want to have a sensible low-pass filter, you could well use one of the filter design apps at