I have designed a good number of power supplies, but I would not attempt an LLC without a good theoretical background. There are few specialists that crank out these designs and they usually know a gr

Most of the time when I have a complicated transformer, I short the unused windings and find the leakage inductance. Then, I add a leakage inductor to each leg of a perfect transformer. Small 60Hz tra

I've often worked with sensitive circuitry during it's development stages. With packaging, and filtering at the various entry and exit points, man-made noise is seldom an issue in the completed design

Sounds like you badly need a consultant. On Sunday, April 7, 2024 at 12:06:07 PM CDT, Andy I <ai.egrps+io@...> wrote: Oops, my fingers typed "That doesn't work to power the isolated half of the

Different transformer technologies yield different values of K. When starting with a transformer you lack experience with, you generally need to build one and test it to establish the parameters for l

Andy, While physical circuits never violate the rules of physics, the people assembling them often ignore some of the rules. In the physical world, leakage inductances are all pervasive as is parasiti

Jeff, I apologize. I mistook the topology of your amplifier. It is simply two class-C amplifiers passing through pi-filters to be combined. It is not the push pull topology I had become accustomed to

Jeff, Ideally, the even order harmonics would dissappear in this configuration, but in reality, the output transistors had to be closely matched to create supression. These transistors were non-linear

Resonant Topologies can be slow. I would start with the basics. Inject various sine waves into your setpoint and collect the phase and gain numbers. That may sound boring, but I've wasted days of my l

I once had a troubleshooting case in which an emitter follower in a power supply was oscillating in the many 10's of MHz. It manifest as parts throughout the system exhibited a 120 Hz rectification ri

Ethan, You can have a lot of fun with PWM generators and audio. Take a pair of analog switches (CD4066)and chop the audio at a couple of hundred kHz and you can use it like a multiplier to fade audio.

Ethan, Good to hear that someone remembers the reverse BJT trick. Another good one is using JET amps right after the volume controls. Having a really high load impedance delays the onset of needing th

As long as one remembers that logic need propagation delays and corresponding time steps, LT works great for logic. On Saturday, October 14, 2023 at 05:35:16 PM CDT, Richard Andrews via groups.io <ric

Go to the Kemet site and run KSIM. It will model the frequency characteristics of a number of capacitors. Mike On Friday, October 6, 2023 at 11:13:39 PM CDT, Jerry Lee Marcel <jerryleemarcel@...> w

I just thought I'd toss in a remark about how very long the start up is due to such incredibly high Q. I had a project that used a 32.768kHz tuning fork to clock a processor. The processor was to init

Hello Robert, I've gotten the needed values from crystal vendors. They'll give the motional capacitance, motional inductance, and series resistance. These all make up a series circuit wich connects be

To Andy, I appreciate your description of Litz wire. It is an often misunderstood technology. I often explain the matter as the wire being the equivalent of concentric pipes. The outermost pipes creat

There's always the temperature rise test. Build it, measure the temperature, and then pass DC through it to achieve an equitable temperature. This has proven tried and true. Especially when the wavefo

Most of what is written is incomprehensible to me. Though I'd enjoy some discussion on motor theory as I too would like to reduce it to a model within LTSpice. From my work with brushless DC motors, I

Andy, I'm a bit new to the conversation, but the keyword "Noise" was involved and pricked my ears up ;). You are correct, The various noise sources are uncorrelated, so introducing an extra resistor t