Andy aka‭

Equivalent Circuit, 1:1 transformer Start by simplifying the circuit and change the transformer to a single inductor. This simplification ignores the benefits of isolation but, flyback converter t...

posted 5y ago by Andy aka‭  ·  edited 4y ago by Andy aka‭

Why are some PCB design software programs considered to be 'hobbyist' programs? Elitism and, folk with money to burn. I've used Altium, PADs, OrCad, Eagle and my current personal favourite is...

posted 4y ago by Andy aka‭  ·  edited 4y ago by Andy aka‭

The up and down vote arrows on electrical engineering don't appear to work. Noticed it yesterday for 1st time. Guys, well-done; it's fixed now (at least on meta) and I'll try on EE shortly. Sept ...

3 answers  ·  posted 6mo ago by Andy aka‭  ·  last activity 5mo ago by Monica Cellio‭

A taper pad is a resistive attenuator that maintains impedances on both ports and provides a specific amount of gain-loss ($A_{12}$): - I have derived formulas for each resistor (that I know to ...

3 answers  ·  posted 3y ago by Andy aka‭  ·  edited 7mo ago by Andy aka‭

If the data sheet doesn't indicate that the two devices are matched then sorry, they probably are not and, you should use a matched device like the PMP5201Y that you linked. That data sheet mention...

posted 2y ago by Andy aka‭

I need to design a simple flyback converter like this: - I want to control duty cycle from another circuit such as an MCU but, I'm unsure how to proceed. My requirements are: - Input voltage 125 ...

2 answers  ·  posted 5y ago by Andy aka‭  ·  last activity 4y ago by Andy aka‭

Embedding pictures is a pain in the ass. First you have to find the picture and save it locally then you have to drop it onto a special box before it can be processed. On SE, you just drag it to wh...

posted 4y ago by Andy aka‭

Why am I getting these downvotes? It started last week (or the week before) and now it seems like it's getting contagious: - Seems like this site has some of the same outrageous inclinations as ...

1 answer  ·  posted 4y ago by Andy aka‭  ·  last activity 4y ago by luap42‭

The lifetime rating is (usually) quoted as "so many" hours at a certain temperature and that is the crucial thing to be aware of. For instance, consider a capacitor like this one: - Some in the ...

posted 5y ago by Andy aka‭  ·  edited 2y ago by Lorenzo Donati‭

Which graph on the picture above better represents real-world use-case? They both represent real-world use cases. The impedance graph informs you how much ESL (effective series inductance) the...

posted 5y ago by Andy aka‭  ·  edited 5y ago by Andy aka‭

Try this out for size: - Hope it's clear. Maybe a little simulation of 10 km 600 Ω line might help paint a better picture: - The voltage (V1) that feeds the t-line via the 100 Ω lamp is a 1 v...

posted 4y ago by Andy aka‭  ·  edited 4y ago by Andy aka‭

I get this message when I tried to edit my previous post on arrows: - My edits are not saved. Testing whether I can edit this post... clearly I can!!! But, I still can't edit my "arrow post" ...

2 answers  ·  posted 5mo ago by Andy aka‭  ·  last activity 5mo ago by Monica Cellio‭

To add to Olin's excellent answer, if you were probing on a digital IO line in order to view a fast changing signal, without the local ground clip (or spring) grounded close to where you make the m...

posted 5y ago by Andy aka‭

I have recently finished designing a buck-boost converter for a job that uses a split (+/-) input power supply. Load power is taken equally from both positive and negative input supplies and, the ...

1 answer  ·  posted 3y ago by Andy aka‭  ·  edited 2y ago by Lorenzo Donati‭

Is there any way to reset a core quickly without having ground / reference terminal pulled towards negative voltage Unfortunately not but, if instead of trying to send the complete pulse throu...

posted 3y ago by Andy aka‭  ·  edited 3y ago by Andy aka‭