PI Audio

[Mdtoday]

Hello dear mdtoday
Please forgive me for my wrriting here.
I have a question about your schematic, 100k trimmer.
For doing 0mv out of first amp, do you think i should do it before connecting my pi to c8 or it is better to be connected my pi?!

No problems.
Adjust to 0V with no input to C8, see notes on schematic at start of the thread and Mickstv’s original drawing.

Cheers

[h9361]

Looks ok, now go build it and try it out, build the power supply and audio amp first, make sure it works, then add Mickstv circuit, do it in stages, test each stage then move to next one. Dom44 did a through hole version, others have built that one too, he used an Lm386.
As Mickstv and others have said, the circuit works, so why not build as per the schematic posted first, give it a try then start changing things.
It is the best way to start, try not to complicate things, I’m sure you will do just fine.

Hello dear mdtoday
Please forgive me for my wrriting here.
I have a question about your schematic, 100k trimmer.
For doing 0mv out of first amp, do you think i should do it before connecting my pi to c8 or it is better to be connected my pi?!

[surfdetector]

Hello
Dear mickstv
Please see attached, it's explanation of Mr. Carl about GB process.
I think your method is completely different (U-second and formulation) than it.
Is it possible to tell me more about your method?
Thanks
[ATTACH]55642[/ATTACH]

@h9361
This thread is about PI Audio, you should really start a new thread if you want to begin asking about Ground Balance.

[h9361]

No pin1 of IC8a. Forget about the HH sat, the rest of the circuit has a manual threshold control, which is better for small target detection.

It's easier to do three samples the you only need one integrator.

S1 about 5us, S2 130us and S3 125us all approx. Then you adjust the delay between S1 and S2 to ground balance

Hello
Dear mickstv
Please see attached, it's explanation of Mr. Carl about GB process.
I think your method is completely different (U-second and formulation) than it.
Is it possible to tell me more about your method?
Thanks

[h9361]

Looks ok, now go build it and try it out, build the power supply and audio amp first, make sure it works, then add Mickstv circuit, do it in stages, test each stage then move to next one. Dom44 did a through hole version, others have built that one too, he used an Lm386.
As Mickstv and others have said, the circuit works, so why not build as per the schematic posted first, give it a try then start changing things.
It is the best way to start, try not to complicate things, I’m sure you will do just fine.

thanks dear Mdtoday.
I saw Dom44's PCB. He used the attached schematic, do you think it's true? Off course, i think he labeled mistakenly E and C of Q1 in his PCB.

[Mdtoday]

Hello
Dear Mdtoday.
I want to make your Audio + Mr. Walter's audio + HH1 audio and to compare them.
As you remember, i'm trying to build your schematic based dip method, not SMD.
Mr. Walter helped me (i really thank him) how to add a LM386 to your schematic (attached). Off course, he pointed that i need to build and test.
Anyway, is it possible to tell me your suggestion for adding LM386?
Thanks.
[ATTACH]55366[/ATTACH]

Looks ok, now go build it and try it out, build the power supply and audio amp first, make sure it works, then add Mickstv circuit, do it in stages, test each stage then move to next one. Dom44 did a through hole version, others have built that one too, he used an Lm386.
As Mickstv and others have said, the circuit works, so why not build as per the schematic posted first, give it a try then start changing things.
It is the best way to start, try not to complicate things, I’m sure you will do just fine.

[h9361]

VR1=100k and C8 = 2.2uF

Hello
Dear Mdtoday.
I want to make your Audio + Mr. Walter's audio + HH1 audio and to compare them.
As you remember, i'm trying to build your schematic based dip method, not SMD.
Mr. Walter helped me (i really thank him) how to add a LM386 to your schematic (attached). Off course, he pointed that i need to build and test.
Anyway, is it possible to tell me your suggestion for adding LM386?
Thanks.

[h9361]

Once again this has nothing to do with the thread. You need to post in the HH1 part of the forum.

This is off topic....

OK, thank you

[mickstv]

Hello
Dear Surfdetector.
Please see the attached, it's HH1 audio part. Do you think it's correct or has error?!
Thank you
[ATTACH]55362[/ATTACH]

Once again this has nothing to do with the thread. You need to post in the HH1 part of the forum.

This is off topic....

[h9361]

You can easily find this by using a damping resistor jig as in this video:
https://youtu.be/Gr__N4_k2Mc

Hello
Dear Surfdetector.
Please see the attached, it's HH1 audio part. Do you think it's correct or has error?!
Thank you

[h9361]

VR1=100k and C8 = 2.2uF

Thanks for your helping.

[Mdtoday]

Hello
Dear Mdtoday
Can you tell me value of VR1-Pot in your schematic?
Thanks.[ATTACH]55332[/ATTACH]

VR1=100k and C8 = 2.2uF

[h9361]

Measured with input zero it is 400hz, just change to suit your requirement

Hello
Dear Mdtoday
Can you tell me value of VR1-Pot in your schematic?
Thanks.

[h9361]

You can easily find this by using a damping resistor jig as in this video:
https://youtu.be/Gr__N4_k2Mc

Thanks dear surfdetector.
I enjoyed from it.

[surfdetector]

Hello
Dear Qiaozhi.
Please forgive me for my question.
Have you ever received any report for best damping value of 320-350uh coil (Hammerhead)?
Thanks.

You can easily find this by using a damping resistor jig as in this video:
https://youtu.be/Gr__N4_k2Mc