Whites Surf PI schematic

[dbanner]

I can't say, try looking to DATASHEET of various devices to compare operating parameters.

[nonkapo]

I think you get me wrong.I have no doubt about the parameters. Just need confirmation that 10volt 7660 will work in 12v powered surf PI. For Bara it is clear one need 12v 7660S or 7660A. Thanks.

[Qiaozhi]

I think you get me wrong.I have no doubt about the parameters. Just need confirmation that 10volt 7660 will work in 12v powered surf PI. For Bara it is clear one need 12v 7660S or 7660A. Thanks.

For the Baracuda even the 12V versions of the 7660 are not sufficient, as 12V is the nominal voltage, and the maximum voltage can be as high as 13.2V. Eventually the 7660 will let out the magic smoke.

[Andi68]

But the Baracuda also draws much more power than the surf, I measured 120mA, and I think that kills the 7660 even more

[Qiaozhi]

But the Baracuda also draws much more power than the surf, I measured 120mA, and I think that kills the 7660 even more

The 7660 is only used to generate a negative supply, and the switching current is drawn directly from the battery, so the load on the 7660 is minimal in comparison to the total current. The problems that kill the 7660 are described in the Geotech Baracuda Rev-A Build Document. But this is the wrong thread to be commenting on the Baracuda.

[Andi68]

I totally agree with you

[nonkapo]

I've checked the surf yesterday, stand by current was around 50ma. When target detected it goes 65-70 depending on the strenth of the signal. Will try later putting CMOS timer to see how much difference it will make. As per the Cuda i cant say - still working on it but from what i remember 7660 maximum current was 100ma, same as 78L05 isnt it? So it get screwed both the ways:-)

[blacktaci]

[QUOTE = Dirceu'nun; 95350] Merhaba! NELSON


Off-trimer'ı ayarlıyor musunuz?
Manyetik kulağımı 1 kpF (orijinal şematikte C9) yerine bir piezo ve 220pF kapasit?r ile değiştiriyorum.
Benimle ilgili t?m hedef mesafeleri nihai ses algılamasını ifade eder (sadece k???k bir "tıklama").

Saygılarımızla,
Dirceu. [/ QUOTE]
220pf ?alışmıyor.

[Qiaozhi]

[QUOTE = Dirceu'nun; 95350] Merhaba! NELSON


Off-trimer'ı ayarlıyor musunuz?
Manyetik kulağımı 1 kpF (orijinal şematikte C9) yerine bir piezo ve 220pF kapasit?r ile değiştiriyorum.
Benimle ilgili t?m hedef mesafeleri nihai ses algılamasını ifade eder (sadece k???k bir "tıklama").

Saygılarımızla,
Dirceu. [/ QUOTE]
220pf ?alışmıyor.

Please read the forum rules -> Basic Rules of the Forums
and make your posts in English.

[blacktaci]

[QUOTE = Qiaozhi; 258199] L?tfen forum kurallarını okuyun -> Forumların Temel Kuralları
ve yayınlarınızı İngilizce yapın . [/ QUOTE]

Thank you Qiaozhi

[peyman 74]

hi to all.has someone a solution to make surf pi stronger??

[kt315]

i think i must be working in swett home Whites to make surf stronger. but my recent job...
you know this situation - you need a dirty job to elementary survive in this mad world.



pleasure
Anatloy

[dbanner]

Yes, build a fast coil of spiral design. Use enamel wire 0.4 to 0.6 mm. 30 turns. You will see big gain in depth of 3 to 4 inches more. Shield the coil. Use Tl072 .

[nonkapo]

Are you using tl072 instead of 5534???? It sounds not a good substitute to me. Are you changing the passive elements when doing this?

[kt315]

Yes, build a fast coil of spiral design. Use enamel wire 0.4 to 0.6 mm. 30 turns. You will see big gain in depth of 3 to 4 inches more. Shield the coil. Use Tl072 .

fastest basket coil. two-stage front amp with Eric's 5us STROBE DELAY. controlled PULSE WIDTH.