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 3y ago by Andy aka‭  ·  edited 1y 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 2y ago by Andy aka‭  ·  edited 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 3y ago by Andy aka‭  ·  last activity 1y 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 1y ago by Andy aka‭  ·  edited 1y 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 6mo ago by Andy aka‭  ·  edited 6mo 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 ra...

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

What benefit has a differential amplifier when measuring the signal from a sensor that is remotely located such as in this example: - Why can't I use an arrangement like this: -

1 answer  ·  posted 3y ago by Andy aka‭  ·  last activity 2y 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 2y ago by Andy aka‭

Since we are trying to keep the impedance matched to 50 ohms, what is the best strategy to approach this circuit? A low pass $\pi$ network seems a good route to go. Basically your $\pi$ networ...

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

Inductance is defined by the shape of the coil, the area of the coil, the number of turns in the coil, the distance between turns, the ferromagnetic permeability of material within (and surrounding...

posted 1y ago by Andy aka‭

That fourth connection is the bulk/body/substrate connection: - Image from here. On a normal 3 terminal MOSFET the "body" is connected to the source. On your device, the 3 n-channel MOSFETs shar...

posted 11mo ago by Andy aka‭  ·  edited 11mo ago by Andy aka‭

What kind of IC can be used to drive the MOSFET, so that when the voltage drops below 6.2 V the battery disconnects from the load? That reverse protection MOSFET works fine for reverse protect...

posted 8mo ago by Andy aka‭  ·  edited 8mo 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 7mo ago by Andy aka‭  ·  edited 7mo 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 ...

2 answers  ·  posted 6mo ago by Andy aka‭  ·  last activity 6mo ago by a concerned citizen‭

The magnetic field will always be strongest in the middle of the solenoid. It will be slightly less at the ends of the solenoid and, it will be a lower value on the outside of the coil half way bet...

posted 4mo ago by Andy aka‭