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 4y ago by Andy aka‭  ·  edited 3y 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 2y ago by Andy aka‭  ·  edited 2y ago by Andy aka‭

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 4y ago by Andy aka‭  ·  edited 1y ago by Lorenzo Donati‭

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 4y ago by Andy aka‭  ·  last activity 3y ago by Andy aka‭

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 3y ago by Andy aka‭  ·  edited 3y 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 3y ago by Andy aka‭  ·  last activity 3y ago by luap42‭

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 9mo ago by Andy aka‭

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 4y 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 3y ago by Andy aka‭  ·  edited 3y 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 3y ago by Andy aka‭

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 2y ago by Andy aka‭  ·  edited 2y ago by Andy aka‭

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 2y ago by Andy aka‭  ·  last activity 1y ago by Lorenzo Donati‭

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 2y ago by Andy aka‭  ·  edited 1y ago by Lorenzo Donati‭

Is it because for AC signals the emitter looks like a short to ground and that essentially increases the voltage drop across the collector resistor? Yes. The gain of a common emitter amplifier is...

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

How is it possible to generate 500V on a trafo secondary given the 1:1 ratio? In a DCM flyback transformer circuit, the secondary winding is being used as a pure inductor. So, once the primary...

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