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

[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.

[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/show...715#post182715

[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]

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/show...ght=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]

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

[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.

[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.

[h9361]

Thanks dear Walter.
I tried to follow Carl's book method (attached). I think its method only uses two samples, target and EFE

[waltr]

Thanks dear waltr.
Do you think HH1 is able to detect high depth target?

Define what you mean by "high depth target".

Exacty....I have detected a soda can at nearly 2 feet down. Got a US large cent coin at 12 inches. Is this what you mean?

Sorry, I edited schematic, Audio part.
[ATTACH]55033[/ATTACH]

Not sure if that will work. One sampling switch is for target sampling the other is for EFE.
That is not what I did to add GEB.

[h9361]

Sorry, I edited schematic, Audio part.

[h9361]

Define what you mean by "high depth target".

My mean is reaching sensitivity to commercial detector like TDI.

[h9361]

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?

[Qiaozhi]

Do you think HH1 is able to detect high depth target?

Define what you mean by "high depth target".

[h9361]

Thanks dear waltr.
Do you think HH1 is able to detect high depth target?

[waltr]

Dear Qiaozhi
During last 10 years, has anyone been able to add GB to HH1 like TDI ?

Not HH1 but check my thread on how I do GEB on HH2.
https://www.geotech1.com/forums/show...ake-on-the-HH2