Voodoo Main Discussion

[Qiaozhi]

hi guys, i found what is generating poop signals. no more beep beep beep, I had made an extension of cable between the circuit and the various coils to be tested .. in fact it's been two weeks that the circuit works perfectly .. but because of this nasty cable (test) well i had all the miseries in the world .. the circuit works very well .. cool.
this afternoon I will do the coil with the rg58, normally the result will be good!

I'm very pleased you found the problem, as it was becoming difficult to figure out what could possibly be wrong.

[surfdetector]

hi guys, i found what is generating poop signals. no more beep beep beep, I had made an extension of cable between the circuit and the various coils to be tested .. in fact it's been two weeks that the circuit works perfectly .. but because of this nasty cable (test) well i had all the miseries in the world .. the circuit works very well .. cool.
this afternoon I will do the coil with the rg58, normally the result will be good!

That is good news! Is the noise on your pre-amp output gone now?

[lamoiz]

hi guys, i found what is generating poop signals. no more beep beep beep, I had made an extension of cable between the circuit and the various coils to be tested .. in fact it's been two weeks that the circuit works perfectly .. but because of this nasty cable (test) well i had all the miseries in the world .. the circuit works very well .. cool.
this afternoon I will do the coil with the rg58, normally the result will be good!

[lamoiz]

Hi, Are you on 10x attenuation on your probes and also on the oscilloscope? The amplitude of your signals does not look correct it is much too small I think.
Can you show Pin #1 of the 4066 again at 100uS

Please also show Pin #1 and #7 of the 5532

here are the curves with the 10/1 probe. 1 from 4066 and 1 and 7 from 5532 ..
thanks Alec

[surfdetector]

hi surf, thank you for helping me here are the pictures of pin 1 and pin 13. there is also tp2 debug on it ..
[ATTACH]53881[/ATTACH][ATTACH]53882[/ATTACH][ATTACH]53882[/ATTACH]

Hi, Are you on 10x attenuation on your probes and also on the oscilloscope? The amplitude of your signals does not look correct it is much too small I think.
Can you show Pin #1 of the 4066 again at 100uS

Please also show Pin #1 and #7 of the 5532

[lamoiz]

Hi lamoiz would you post a picture of Pin #1 and Pin #13 from the 4066?

hi surf, thank you for helping me here are the pictures of pin 1 and pin 13. there is also tp2 debug on it ..

[surfdetector]

I see absolutely nothing on tp 8 ... why ..

Hi lamoiz would you post a picture of Pin #1 and Pin #13 from the 4066?

[lamoiz]

I see absolutely nothing on tp 8 ... why ..

[lamoiz]

Did you miss post #536?

bonjour George,
here are two images,
tp6 tp10
tp 7 tp8

I also noticed that in hybrid mode, the non-ferrous bar is at maximum, with no target above ..

[lamoiz]

I would recommend using a high-impedance speaker (e.g. 50 ohms or higher).
Personally, I was using a set of headphones with a built-in volume control.
Although it doesn't show it in the circuit diagram, I sort of assumed (perhaps incorrectly) that constructors would also fit a volume control.

good evening george, I only had an 8r speaker on hand ..c is the reason for this choice .. yes I had not read the post 536, I will make you a picture of that tomorrow. thank you for everything.

[MartyJ1963]

Thanks everyone,,I only had 8 ohm x 1w speakers for my other projects so I just ordered 2 x Quinlon 0.5W / 16mm Diameter 50 ohm speakers for my Voodoos. Thanks again, Marty.

[Qiaozhi]

I am still with the problems of "noise" at the exit of the 2nd stage of the preamp .. and beep beep beep .. I checked and re-checked all the components ... I do not understand where it comes from ...

Did you miss post #536?

[Qiaozhi]

Hiya Alec,,What speaker are you using for your Voodoo? And did you have to change the value of R64? I only ask because Lamoiz mentioned problems with his project using an 8 ohm speaker. Thanks, Marty.

I would recommend using a high-impedance speaker (e.g. 50 ohms or higher).
Personally, I was using a set of headphones with a built-in volume control.
Although it doesn't show it in the circuit diagram, I sort of assumed (perhaps incorrectly) that constructors would also fit a volume control.

[lamoiz]

Thanks for the reply Alec,,I'll have to see what other speakers I can get hold of. Excellent work you did on the you tube videos!!,Regards, Marty.

I kept the 8r speaker and installed a resistance of 180r instead of 33 ..

[lamoiz]

I am still with the problems of "noise" at the exit of the 2nd stage of the preamp .. and beep beep beep .. I checked and re-checked all the components ... I do not understand where it comes from ...