Totem-pole gate driver VS Active pull down VS Fast Fet turn off

[Carl-NC]

Actually, i want to use a Non-VCO mode with a fixed sound like TDI.

TDI does not have a fixed sound, it has VCO audio. But yes, you can set the Rev D audio to whatever frequency you like.

Please see attached, i added GB and Gain control (from Mr. Walter schematic) to HH1 Rev. D. Can you tell me your opinion?

You still need EFE sampling. This is where a micro saves a lot of logic chips.

My mean is reaching sensitivity to commercial detector like TDI.

If you are very experienced in PI design it might be possible to achieve something close to a TDI. If you do not have the experience, then no.

[Qiaozhi]

Hello
Dear Qiaozhi.
Please see attached, i added GB and Gain control (from Mr. Walter schematic) to HH1 Rev. D. Can you tell me your opinion?
[ATTACH]55032[/ATTACH]

Carl (designer of the HH) and waltr have answered your question.
As Carl says, adding a micro would make things a lot easier. In that case you would be better to follow waltr's HH2 version with GB already added.

[h9361]

Carl (designer of the HH) and waltr have answered your question.
As Carl says, adding a micro would make things a lot easier. In that case you would be better to follow waltr's HH2 version with GB already added.

Hello
Dear Qiaozhi.
I read your posts about GB. You posted two different posts, please check parameters the in the links.
I think S2 and S3 in your formula is different, which of them is true?!
Thanks

https://www.geotech1.com/forums/showthread.php?21179-GROUND-CONTROL-PI-CIRCUIT&highlight=Hammerhead

https://www.geotech1.com/forums/showthread.php?23802-Detection-distance-ground-vs-air&p=229548#post229548

[Qiaozhi]

Hello
Dear Qiaozhi.
I read your posts about GB. You posted two different posts, please check parameters the in the links.
I think S2 and S3 in your formula is different, which of them is true?!
Thanks

https://www.geotech1.com/forums/showthread.php?21179-GROUND-CONTROL-PI-CIRCUIT&highlight=Hammerhead

https://www.geotech1.com/forums/showthread.php?23802-Detection-distance-ground-vs-air&p=229548#post229548

The above links point to a thread, and not a particular post, so I'm not sure which equations you're referring to.
I believe the following are correct:
S1 = main sample
S2 = GB sample
S3 = EFE sample

[h9361]

The above links point to a thread, and not a particular post, so I'm not sure which equations you're referring to.
I believe the following are correct:
S1 = main sample
S2 = GB sample
S3 = EFE sample

So, which of them is true?
A1(S1 - S3) - A2 (S3 - S2)
Or
A1(S1 - S3) - A2 (S2 - S3)
Thanks

[Qiaozhi]

So, which of them is true?
A1(S1 - S3) - A2 (S3 - S2)
Or
A1(S1 - S3) - A2 (S2 - S3)
Thanks

The correct equation is here:

https://www.geotech1.com/forums/showthread.php?21179-GROUND-CONTROL-PI-CIRCUIT&p=182715#post182715

[dbanner]

So, which of them is true?
A1(S1 - S3) - A2 (S3 - S2)
Or
A1(S1 - S3) - A2 (S2 - S3)
Thanks

Oh dear. Houston, we've got a problem.