BARACUDA-Legend-1

[Alexismex]

Hello ,this is my aportation for this 2011 year for all my friends of the Geotech Forum...
It is about the legendary BARACUDA...yes i have bought with a good LUCK a 2 hand old model from 1994 ...i test it very nice ...detect in air= alum.coca can at 65 cm very well and gold ring (20mm) at 26cm with 11pulg coil diameter.....NOT BAD !!!! ...nice Audio" also unique" in comparaision with another detector....
General spec mesured by me
-transmiter pulse Fcy= 640 PPS
-Transmitter pulse width= 100 uS (microseconds)
-pulse delay =begin at 22 uS to 60 uS .
-Position knob Delay 1= 22 uS, position 4 =40 uS, Position 9 = 60uS
-sample pulse window 45 uS
Current consumption - 100Ma at 10,5V

I have reverse eng the schematic ...VERY EFICIENT and a beauty design for this particular pulse detector.... bravo Baracuda !!!!
at continuacion i will put some photos i do not remenber to send a compressed archive but if friend like Quiozy can make it ...better
have fun,
Alexis

[Alexismex]

next 5 photos....

[Alexismex]

next 5 end photos

[Alexismex]

sorry,

[Alexismex]

Board... draw by hand old tech

[Alexismex]

To morrow the list of components and next week schematic drawing software published

Have a good time with this beauty.....old vintage detector still alive and good alive!!!!!

Alexis

[hobbes_lives]

The circuit is quite similar to the Whites Surfmaster PI. It has a few minor differences, but looks like it operates on the same basic principle.

[WM6]

To morrow the list of components and next week schematic drawing software published

Have a good time with this beauty.....old vintage detector still alive and good alive!!!!!

Alexis

Great work, Alexismex.

Thank you.

[kt315]

Alexis, nice home work... thanks. I only would like to reminder a point Chris did begin to learn the device from.

Chris
11-13-2002, 08:39 AM
https://www.geotech1.com/thunting/te...acuda_PRE1.jpg


Hi

this is a redrawing from a very blur copy of the Baraccuda PI. If you are interested you can cross check the diagram and post the errors in this forum. Please read the note in the schematic.

thank's in advance....Chris

Carl
11-13-2002, 03:19 PM
Here is what I have, from an older board:

R1 - 100k
R6 - 33k
R11 - 22k
R12 - 33
R13 - 100
R14 - 0
R15 - 150k
R16 - 100k
R17 - 6.8k
R18 - 39k
R21 - 330
R22 - 270k
R23 - 1k
R24 - 150k
R25 - 1M
R26 - 1k
R27 - 20k
R28 - 20k
R29 - 25k (?)
R31 - 33k
R33 - 2.2M
R34 - 100k
R35 - 270k
R36 - 100k
R39 - 33k
R40 - 27.4k

C7 - 100p
C17, C18 - 220u/25v
C19 - 0.1u

Q1 - TIP127 (Darlington PNP)
Q3, Q4 - 2N5485

7660 - pin 8 to B+, pin 6 N/C

Everything else matches. I'm sure there have been component tweaks over the years, so other boards may vary.

- Carl

[Geo]

Hi Alex...
Very good work.
Congratulation
I constructed it before 3..4 years (i used the schematic of geotech) but it did not work. It is time to see if there are differences.

Regards

[nejdet]

Good work!

[Alexismex]

List of all components included off board

[nelson]

List of all components included off board

Te felicito Alexismex, buen aporte hermano y ojala podamos juntos hacer andar este viejo pero excelente equipo.

Atte.

Nelson

[dom44]

I have just built the Barracuda from your reverse engineered pc board and i can say it does work, good job Alexismex but i think i will change the output stage a bit, as the volume is a bit lacking and the led response lacks a bit in relation to the audio.
but i have also built the surf pi and this is much better i think.

thanks

[Alexismex]

Good Dom,
For me the barracuda it is better that the surf with the audio filter,you see in the schematic and foto it is the R 100 K with a diode and a capacitor of 4700 pf ....this arrangment work great and give a sort "of two tone audio" : the audio from the PPS and the another from the sincro 7660 divide per two....a low-high tone