BARACUDA-Legend-1

[Legaucho]

Hello,
You can try those parameters, good luck

All the best

[Nickolaj]

Hi, some time ago found this nice PI building thread..so far so good.
Now i have some problems..my tip127 and 7660 getting very hot in ~5 seconds
Can't find reason. Any ideas where to start?

[bernte_one]

Hello,
You can try those parameters, good luck

All the best

hello

thx, but look at the parameters
you calculate with milli Henry (result high number of turns and layers)
we need here MICRO Henry (sorry)

i have made a multi layer coil with litz wire some weeks ago (posted already here)
result was very good

but some here make good copper wire coil (simple monoloop)
so i thought ok back to simple copper wire but is was not good (i think of thin isolation)

regards bernd p.s good caculator

[ApBerg]

Hi, some time ago found this nice PI building thread..so far so good.
Now i have some problems..my tip127 and 7660 getting very hot in ~5 seconds
Can't find reason. Any ideas where to start?

To high power supply ? not more than 12 volt ! look at the data sheet from your ICL7660 sometimes even not more than 10,5 volt ..

Your coil has to low ' resistance ' ( more winding needed ) ... so to much power consumption... look at it ...not more than 100mA from the power supply

[Legaucho]

hello

thx, but look at the parameters
you calculate with milli Henry (result high number of turns and layers)
we need here MICRO Henry (sorry)

Hello bernd

Thanks for your answer, I confess that I am a bit lost, because I made two different coils, one with these characteristics:
N (Turns) = 36
D0 (internal diameter) = 183,0 mm
(Tickness) = has 4,0 mm
d (wire diameter) = 0,7 mm
L (inductance) = 0,491 mH
O (wire length) = 21,20 m
W (wire weight) = 72,8 g
R (total resistance) = 0,9 Ohms

and a second (that I use as pinpointer) with these characteristics:
N (Turns) = 279
D0 (internal diameter) = 10,0 mm
(Tickness) = has 20,0 mm
d (wire diameter) = 0,7 mm
L (inductance) = 0,487 mH
O (wire length) = 14,76 m
W (wire weight) = 50,7 g
R (total resistance) = 0,7 Ohms

to measure I have one device inductance, with two possible ladders mH and H, then I think that my information must be good, but I can make a mistake.

Good day

[Nickolaj]

To high power supply ? not more than 12 volt ! look at the data sheet from your ICL7660 sometimes even not more than 10,5 volt ..

Your coil has to low ' resistance ' ( more winding needed ) ... so to much power consumption... look at it ...not more than 100mA from the power supply

I have ICL7660SCPAZ, datasheet says 12V. I'm using 11.1V lipo battery.
Coil resitance i measured 3.1 ohms. Without coil circuit draws 340mA, with coil !~3.5A!

I''m a bit confused

Thanks!

[Vermeer111]

Hy nikolay i think your resistance for the coil is too high.
under 2 ohms is ok for the baracuda (i have three coils with resistance from 1,4 to 1,8 ohms)
greetings from the harz montains

[Qiaozhi]

I have ICL7660SCPAZ, datasheet says 12V. I'm using 11.1V lipo battery.
Coil resitance i measured 3.1 ohms. Without coil circuit draws 340mA, with coil !~3.5A!

I''m a bit confused

Thanks!

Check the pulse that drives the MOSFET. It's either being turned on for too long, or it's permanently on. I suspect it's the latter, since 11.1V / 3.1 ohms is very close to 3.5A!

[ApBerg]

I have ICL7660SCPAZ, datasheet says 12V. I'm using 11.1V lipo battery.
Coil resitance i measured 3.1 ohms. Without coil circuit draws 340mA, with coil !~3.5A!

I''m a bit confused

Thanks!

Remove 40106 and then look at your power consumption if then ok -> replace 40106


You have some photo's ?

[Nickolaj]

I tried without 40106..exactly the same result. How to check the pulse that drives the tip127?
I used some substitute parts. That jfet beside the switch is 2n3189 too. Can these parts make so big errors?



Thanks for helping in advance

[silverdog]

check pins:

mpf102 : D,S,G
2n3819 : D,G,S
2n5485 : D,S,G
bf244 : D,G,S

[ApBerg]

NE5534 180 deg turn ? think you need a new one... ?

Take all IC out ... check again power consumption, if ok ( less then 30 mA ...guess ) place 40106 and 7660 inplace and check then powerconsumption and for 5 +/- volts at ic pins

[bernte_one]

hello

found a new source for lt1115
one of my ebay favourites has own homepage now
http://www.hifituning24.de/aktive_ba...lt1115_cn8.php

got two lt1115 today they work good in combination with lf412
tl082 was i little bit unstable and noisy

since i have build first time baracuda i love it and with every mod love gets bigger

regards

[Vermeer111]

Very good find Bernte on cheaper as my find, have you try it with a tl072 ? this is, in the moment, my configuration.Very good, very stable and good sensivity.greetings from the harz montains.

[bernte_one]

hello

i search for measure points to tune my baracuda with oszi
so please if somebody could tell me the best points

for example
coil damping value (for the case a potentiometer is inserted instead of resistor)
delay
offset
fine tune settings

regards and good night