audio-talk

Posted: **Tue Oct 05, 2010 4:58 pm**

Not far off 100 so I should hope so!

Posted: **Tue Oct 05, 2010 5:50 pm**

f-3=R/(2.PI.L)

So 2k for d3a, 80H for L

-3 db point = 2000/(2*3.14*80)

= 4Hz

Should be fine.

Posted: **Tue Oct 05, 2010 6:57 pm**

The man from spice he say "OK" too

Posted: **Tue Oct 05, 2010 9:28 pm**

Mike has been kind enough to do a Spice simulation. There are a couple of "tweeks" added for simplicity (to match my simpliciousness

).

Next thing on the to do list after Aurora copy.(300b interstage).

Posted: **Tue Oct 05, 2010 11:09 pm**

I hope you appreciate that R6 is present to increase the DCR of the choke(s). There are no untoward consequences as far as I can tell.

Posted: **Tue Oct 05, 2010 11:13 pm**

Mike H wrote:I hope you appreciate that R6 is present to increase the DCR of the choke(s). There are no untoward consequences as far as I can tell.

Funnily enough, (and this is true folks !

) I did a few "back of fag packet" calculations before I messaged you and came up with 2.7K as well.

Does that mean I'm clever ?

Posted: **Tue Oct 05, 2010 11:17 pm**

Wow you did calculations, I just guessed.

No really I did

Posted: **Tue Oct 05, 2010 11:22 pm**

Mike H wrote:Wow you did calculations, I just guessed.

No really I did

Target R = 4K

Actual R = 1.1K

4 - 1.1 = 2.9K

Nearest standard value = 2.7K (or actually 3K

)

Simples.

Posted: **Wed Oct 06, 2010 12:01 am**

Works for me.

Are you going to start a new topic on this?

D3A-6C4C munkeee....

Just a suggestion

Posted: **Wed Apr 20, 2022 9:26 am**

Mike H wrote: ↑Tue Oct 05, 2010 4:32 pm 2 x the number of turns = impedance/inductance x 2 squared? Or does that only work if on the same core

My bwain 'urts ....

Sorry Im 13 years late to this party, but inductors have to be on the same core to take advantage of the cubic calculation, two inductors on different cores follow simple addition for inductance and for dcr, purely linear.

The lack of “nodes” in the crossed lines has sent Phil’s thoughts wild as Mike said.

Sorry but there were so many flaws in the understanding sparked by bad symbols. I thought ( thinks?…’what is 320mH about?)

Amp would work well if someone who knows how to realise through the drawing errors, and its effectively no improvement to using the hammond interstage transformer for coupling so I wouldnt build it.

Posted: **Wed Apr 20, 2022 9:37 am**

Oh, and the Monkey topology requires more b+. Glad he used choke input near enough.

Posted: **Mon Apr 25, 2022 6:17 pm**

Thanks for that

audio-talk

A nice D3A---2A3 Monkey circuit

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