BARACUDA-Legend-1

[kt315]

http://web.archive.org/web/19990203192951/http://anchorelectronics.com/

[MartyJ1963]

Hi all,,,,,Thanks to all the replies,,,very much appreciated,,Regards,,,Marty.

[Andi68]

I took BF247B

[kt315]

i resorted out all mosfets' prices on ebay and discovered that bf256 has smallest price. thats why bf256 was choiced while in the schematic i showed 2n5485.

[nonkapo]

I'm using bf256B and Baracuda is performing as it should. Got MPF102 on the Geotech one, but they cost me 4$ each.

[crni1]

You can all of them and the BF 244 as well as some other substitutes just watch the layout of the feet.
The menu works best with BF 244

[MartyJ1963]

Hiya all,,,,probably a silly question, but can I use a J113, BF245C OR a 2N3819 as a substitute for a MPF102 in the Barracuda Legend project? I thought I'd have a go at building the first Barracuda because I've run out of projects to keep myself busy,,lol. Thanks in advance for any help,,,Regards,,Marty

[kt315]

use SMD parts for the Bara and you'll get SMD board. thats is NOT hard you think about.
my board is UNIVERSAL to do both types of placements.

[kt315]

in the beginning of this thread it is noted that this detector gains the ability to discriminate when the tip127 is used. if I am understanding correctly I will need to adjust the 1000uf capacitor to suit?

not. with TIP127 you need slightly to move opamp balance into a side, positive or negative. need experiment here.

[kt315]

nice price for Ikelite case https://www.ebay.com/itm/Ikelite-Case-5280-Underwater-Camera-Housing-Unit-w-Camera-and-papers/273654096038?hash=item3fb70e20a6:g:bjoAAOSwNkJaIwk Z:rk:47f:0
your chance.

[Cladpirate]

in the beginning of this thread it is noted that this detector gains the ability to discriminate when the tip127 is used. if I am understanding correctly I will need to adjust the 1000uf capacitor to suit?

[Andi68]

A Darlington transistor can also switch high frequencies.
In the frequency range of a PI that does not matter anyway

[kt315]

you do not want to notice a capacitance GATE->SOURCE-DRAIN. you need fast charge and fast discharge this cap. thats a time.
the time kills your good idea that MOSFET is better than NPN.

[waltr]

Question, I have bought the silverdog baracuda and am assembling it. May I just use a tip127 I have here in place of the mosfet that came with the kit or does the circuit need to be altered for the tip127 to work properly. Apologies as I am somewhat new to electeonic design and google has provided little information that I am able to understand. My soldering ability is top of the line though. Thank you.

The TIP127 is a Darlington and is far Slow Speed switching. A PI needs a fast switch with fairly low On resistance.

You can give the TIP127 a try but do obtain a MOSFET. It does not need to be the exact same one in the Barrcuda schematics but one with simalar specs.

[kt315]

bara is simplest learning platform for a beginner to start new way in metal detection. you do not have to think what you can/want use.
just think about best in your life, not about that.