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

[h9361]

Please forgive me for my simple questions.
I'm going to build HH1 Rev. D because it has an independent audio part. Actually, i want to use a Non-VCO mode with a fixed sound like TDI.
Please see the link, it's an online tone generator. Please set frequency for 600Hz and hear it, square type. Do you think i can generate such tone by changing R55?!
Thank you for your helps. I need to thank you for All, especially Mr. Qiaozhi and Mr. Carl because i learned many things from PI and etc. in thins forum.

[Qiaozhi]

Please forgive me for my simple questions.
I'm going to build HH1 Rev. D because it has an independent audio part. Actually, i want to use a Non-VCO mode with a fixed sound like TDI.
Please see the link, it's an online tone generator. Please set frequency for 600Hz and hear it, square type. Do you think i can generate such tone by changing R55?!
Thank you for your helps. I need to thank you for All, especially Mr. Qiaozhi and Mr. Carl because i learned many things from PI and etc. in thins forum.

As far as I can see there is no R55 in the HH1 schematic.
The non-VCO option uses the TX oscillator as the audio tone, and this can be adjusted with R2.

[6666]

As far as I can see there is no R55 in the HH1 schematic.
The non-VCO option uses the TX oscillator as the audio tone, and this can be adjusted with R2.

Yep RevD r55 1K pin7 IC9

[h9361]

My mean is HH1 Rev. D, Pin7 Ic9. Do you think we can such tone by changing R55?

[h9361]

Yep RevD r55 1K pin7 IC9

Hello
Dear 6666
Have you tested this, Non-VCO? Do you think we have such tone (exp. 600HZ) by changing R55?
In Rev. C, Non-VCO is very strident. It seem that sound is very very sharp and bad. For exp, i set my TX over 900Hz and compared my output sound with 900Hz in the link tone generator. I think the two sounds are very very different, especially my HH1 very very strident. In addition, my sound level in Rev. C is very weak so that its volume dose not increase, do you think it's normal?

[Qiaozhi]

Yep RevD r55 1K pin7 IC9

Sorry - I must have been looking at the REV-C version.

[h9361]

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

[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

[h9361]

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

[Qiaozhi]

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

Define what you mean by "high depth target".

[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?

[h9361]

Define what you mean by "high depth target".

My mean is reaching sensitivity to commercial detector like TDI.

[h9361]

Sorry, I edited schematic, Audio part.

[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]

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