JamJar: an HPA-1-inspired power amp

[jam]

Did someone say shunt regulator..........

....an example to analyze.

Jam

 

[JeffYoung]

Is it as simple as running an AC sim with the input on the power line?

If so, this suggests I'm good up to 77kHz.

I assume I only need to worry about up to, say 48kHz? Or do I need to cover the amp's entire bandwidth?

Thanks,
Jeff

 

[JeffYoung]

That was Beefcake. JamJar's PSRR isn't nearly as good, so it probably needs the CRCR pi filter....

 

[2 picoDumbs]

If so, this suggests I'm good up to 77kHz.

You're forgetting the CRC supply that is upstream of the regulator.
It will be better than this.

The focus should always be to remove the rectified powersupply ripple and it's harmonics.
Worrying about what is happening above 15kHz is like worrying about buttering your bread with a stainless steel knife or a silver plated knife.
Having said that it isn't hard getting good performance up high.

 

[2 picoDumbs]

That was Beefcake. JamJar's PSRR isn't nearly as good, so it probably needs the CRCR pi filter....

I much prefer feeding the shunt with CRCRCRCR etc than a Constant Current Source

You could remove the CCS feeding Jam's circuit and put in CRCRCRCRCR

 

[Zen Mod]

I much prefer feeding the shunt with CRCRCRCR etc than a Constant Current Source

.....

we all know that you're just trying to be different



why not CRCRCRCRCLCRCRCRCR ?

 

[JeffYoung]

... is like worrying about buttering your bread with a stainless steel knife or a silver plated knife...

No silver plate here. When we set the table it's proper silver. 😉

 

[jam]

I would use a CRC followed by a different current source. A depletion mosfet used as a current source is medicore at best...How about this ...

What I posted was only a possible starting point.😉

 

[jam]

....but if you really want to go nuts! Try the following......

 

[jam]

......or. 😀

 

[2 picoDumbs]

we all know that you're just trying to be different



why not CRCRCRCRCLCRCRCRCR ?

As unbelievable as it may seem, there are limits to my dumbness.
It’s usually laziness that gets in the way though. Hahaha

 

[2 picoDumbs]

......or. 😀

Your appreciation for the finest and most under-rated food on planet earth is commendable

 

[jam]

You know it.........

 

[Gluca]

now ... I want to try this vegemite.

 

[2 picoDumbs]

now ... I want to try this vegemite.

Hahahaha
I hope you like savory. It's not sweet like nutella, absolutely nothing like that.
Kind of like salty Guinness on toast.
Hahahaha

 

[jam]

Straight to the pool room...........

For reference pico YouTube

 

[Gluca]

hum ... amazon prime ... I might have it the next day

 

[jam]

Hear Ye, Hear Ye

Guys and fellow Aussies

All kidding aside I propose we start a pre-amp thread after we are finished with this power amp. design.

Any comments?

Jam

 

[2 picoDumbs]

As long as there is vegemite, I will be there.

 

[2 picoDumbs]

Straight to the pool room...........

For reference pico YouTube

These guys are vegemite amateurs.
Spreading the right quantity of vegemite on toast is a very important and much overlooked step (the toast needs to be also buttered), it's like getting good solder joints, there is a certain level of skill involved, these guys have none.