mtwieg's latest activity

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mtwieg replied to the thread Bode plot.

I certainly would not try this unless all the other circuitry on the secondary side is also referenced to PE. Basically that means I...

Tuesday at 1:10 PM
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mtwieg replied to the thread PSFB converter with resonance phenomenon.

An example waveform would be helpful in describing the problem. Could be that you just need RC snubbers across the output diodes.

Tuesday at 1:00 PM
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mtwieg replied to the thread Bode plot.

I'd be very cautious about shields and/or filters to the injection transformer. One of the fundamental assumptions of this method of...

Monday at 1:42 PM
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mtwieg replied to the thread [SOLVED] Air dielectric strength for high power patch antenna.

30V/mil is equivalent to 2000kV/m. So your measured field of 30kV/m should be fine. Or did you measure 30kV per mil instead of 30kV per...

Monday at 1:34 PM
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mtwieg replied to the thread Question about impedance matching.

Yes, sometimes transmission lines are desirable, like for making couplers or splitters/combiners. For example if I want to make a...

Monday at 1:28 PM
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mtwieg replied to the thread [SOLVED] Air dielectric strength for high power patch antenna.

Typical dielectric strength of air is 3000kV/m, not 30KV/m. You should be fine.

Sunday at 3:16 PM
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mtwieg replied to the thread Question about impedance matching.

I've never heard the term "reactive matching". "Artificial transmission line" likely refers to a lumped element transmission line, i.e...

Sunday at 3:05 PM
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mtwieg replied to the thread 90 degree phase shifter for a sine wave with variable frequency.

Ok this changes everything. Use a function generator with two outputs, and use it to directly generate the phase shifted output (with...

Saturday at 1:47 PM
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mtwieg replied to the thread Extended range for TL431 voltage reference.

I can see the intent of the circuit, but also would guess doing the subtraction after attenuating the battery voltage would be the...

Mar 27, 2025
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mtwieg replied to the thread [SOLVED] What is Deep class AB?.

Probably just a slang term for using a conduction angle close to 180 degrees. Not very useful slang IMO.

Mar 27, 2025
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mtwieg replied to the thread 90 degree phase shifter for a sine wave with variable frequency.

facepalm This is why FvM clearly asked if a differential phase shift was acceptable. The short answer is no, there's no way to create...

Mar 27, 2025
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mtwieg replied to the thread 90 degree phase shifter for a sine wave with variable frequency.

1. The filter order n is the number of opamp stages in each branch. In this case you've chosen n=3 2. The number of paths is 2, no...

Mar 26, 2025
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mtwieg replied to the thread 90 degree phase shifter for a sine wave with variable frequency.

Passband ripple can be decreased by increasing the order of the filter (i.e. more RC stages), but some amount of ripple is unavoidable...

Mar 25, 2025
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mtwieg replied to the thread Bode plot.

LTspice does have their own way of deriving bode plots automatically from transient simulations, they call it the FRA. It's not as nice...

Mar 25, 2025
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mtwieg replied to the thread TPS61088 - Cannot get enough current.

Sounds like you should do some basic measurements on the actual circuit: 1. Verify the switching frequency is what you expect 2. Check...

Mar 18, 2025

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