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[technos]

Hi,Geo,I already tried different caps.Yes the sound become more beautiful if you put 7-8nf instead of 10.But it seems to me like the depth goes less with changing sound to high frequency.

I think if you want better sound you need to change the square wave osc. and find a sine osc. imho.

[Pompey]

Hi pompey.
I don't say to change the value of the capacitor but to short it (to jump), so to don't exist capacitor

Regards

I see!I read "sort" and I think that means to change it Also i made a mistake,I chaged C30 on my pcb,not C26 - C30 for audio frequency..

[Geo]

Hi,Geo,I already tried different caps.Yes the sound become more beautiful if you put 7-8nf instead of 10.But it seems to me like the depth goes less with changing sound to high frequency.

Hi pompey.
I don't say to change the value of the capacitor but to short it (to jump), so to don't exist capacitor

Regards

[Pompey]

Try to sort the C26. Sound becomes more good (not 555 version)

Hi,Geo,I already tried different caps.Yes the sound become more beautiful if you put 7-8nf instead of 10.But it seems to me like the depth goes less with changing sound to high frequency.

[Geo]

Hi,Geo!Everything is OK.This pcb without 555 work as you described.My pcb work so too.I don`t like sound at all.I have finished 555 pcb but not tested yet.My friend has made pcb with 555 and he has big depths and very good sound.I think that 555 is the best variant.

Try to sort the C26. Sound becomes more good (not 555 version)

[Geo]

Bluemax has Tx =540uH and Rx = 33mH.
Also Tx and Rx are not in phase.

Regards

[Vladimir]

Ne odnosi se na dd sondu 27cm

Translate - Valid for the dd coil 27cm


Geo has a problem with his probe blue max, Do you have any idea?

[Orbit]

Ne odnosi se na dd sondu 27cm

[Orbit]

ne odnosi se na dd standardnu sondu

[Vladimir]

Orbit
This can refer to the original coil, or the Blue Max?

[Orbit]

Pravilna sinusoida ,ne vise slomljena .Veci domet ,stabilniji rad.

[Orbit]

sinusoida sa 22nf nije vise slomljena , veci domet i stabilnji rad .

[Orbit]

sinusoida sa 22nf nije vise slomljena , veci domet i stabilnji rad .

[Vladimir]

Finally i found the solution but have another problem.
I reversed the Tx signal again.... and i made a new calibration of the Phase, Geb and total phase potentiometers and now is ok.
It full rejects a piece 10cm of ferrite rod, also don't beep at iron and it is good on gold and copper.
But i lost depth!!!!!
It detects a 30mm coin at 40cm, no good depth for a 15" coil.
Yesterday when it was unstable it detected the same coin at 50+cm.....
Also it detects the soda can at 75cm compared to 1m yesterday.
Sound is worst ..... when the signal is strong it beeps OK, but when it is a medium or small then it beeps interrupted. Maybe i must replace it with the 555. Also it needed a fine tuning of the coil.
Maybe tommorrow if i will have free time

Regards

Hi Geo
You must change the value of C9, how? I am not
sure, I think it would be good 6n8. Capacitor and
potentiometer, which are already added, in this case you should
remove.

[Pompey]

Finally i found the solution but have another problem.
I reversed the Tx signal again.... and i made a new calibration of the Phase, Geb and total phase potentiometers and now is ok.
It full rejects a piece 10cm of ferrite rod, also don't beep at iron and it is good on gold and copper.
But i lost depth!!!!!
It detects a 30mm coin at 40cm, no good depth for a 15" coil.
Yesterday when it was unstable it detected the same coin at 50+cm.....
Also it detects the soda can at 75cm compared to 1m yesterday.
Sound is worst ..... when the signal is strong it beeps OK, but when it is a medium or small then it beeps interrupted. Maybe i must replace it with the 555. Also it needed a fine tuning of the coil.
Maybe tommorrow if i will have free time

Regards

Hi,Geo!Everything is OK.This pcb without 555 work as you described.My pcb work so too.I don`t like sound at all.I have finished 555 pcb but not tested yet.My friend has made pcb with 555 and he has big depths and very good sound.I think that 555 is the best variant.