[x] Welcome at THunting.com!

A fun place to talk about Metal Detecting, Treasure Hunting & Prospecting. Here you can share finds and experience with thousands of members from all over the world

Join us and Register Now - Its FREE & EASY

THunting.com
Treasure Hunting & Metal Detecting Community
   
Advanced Search
*
Welcome, Guest! Please login or register HERE - It is FREE and easy.
Only registered users can post and view images on our message boards.
Did you miss your activation email?

Login with email, password and session length
Or Login Using Social Network Account
2
News:
Pages:  1 2 3 4 5 6 7   Go Down
Print
Share this topic on FacebookShare this topic on Del.icio.usShare this topic on DiggShare this topic on RedditShare this topic on Twitter
Tags:
0 Members and 1 Guest are viewing this topic.
Offline golddustcarlTopic starter
Silver Member
*

Mood:Happy
Happy

Join Date: May, 2014
Thank you159

Activity
0%
Male
United States
Posts: 1333
Referrals: 0

7377.00 Gold
View Inventory

Awards

NOKTA SIMPLEX+,Tesoro Vaquero, VibraProbe 580, Garrett Carrot, Garrett Master Hunter ADSIII
« Reply #40 on: May 26, 2014, 01:48:43 pm »
Go Up Go Down

wm6
Thanks for bringing that up. Yes the PTC thermistor should be mounted near the mosfet. Also be sure to mount the mosfet on some type of heatsink. As large as your enclosure will permit. The mosfet does not get very warm because of the 4% duty cycle, but less heat is even better. The ptc works by limiting base current as the mosfet warms up thereby stabilizing the peak  output I have designed a lot of drift compensation into the detector, so some of my circuits may not seem clear..
glad to help.
Golddust.

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,56782.msg275740.html#msg275740


A bad day at gold prospecting or metal detecting is better than a good day at work.


Logged

GOLDDUST CARL

Offline johnny23
Knight
Copper Member
*

Join Date: Mar, 2014
Thank you18

Activity
0%
Male
Canada
Posts: 58
Referrals: 0

305.00 Gold
View Inventory

Awards

radio shack, garret ,minelab
« Reply #41 on: May 26, 2014, 02:12:25 pm »
Go Up Go Down

hi guys one of my thoughts on keeping  the  electronics cool especially when running @ higher voltages was using a  peltier   module to keep the  internals cool  and running at optimum   

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,56782.msg275744.html#msg275744




Logged
Offline Homefire
Global Moderator
Platin Member
*****

Join Date: Jan, 2009
Thank you662

Activity
0%
Male
United States
Posts: 15906
Referrals: 0

52360.00 Gold
View Inventory

Awards
« Reply #42 on: May 26, 2014, 03:15:44 pm »
Go Up Go Down

No one wants to carry around a battery that can produce the current required.   A cooler Cooled with a Current peltier device will run down a truck battery in  hours.

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,56782.msg275746.html#msg275746




« Last Edit: May 26, 2014, 03:36:04 pm by homefire »
Logged
Offline johnny23
Knight
Copper Member
*

Join Date: Mar, 2014
Thank you18

Activity
0%
Male
Canada
Posts: 58
Referrals: 0

305.00 Gold
View Inventory

Awards

radio shack, garret ,minelab
« Reply #43 on: May 26, 2014, 07:28:45 pm »
Go Up Go Down

 peltier Consumer products[edit]
Peltier elements are commonly used in consumer products. For example, Peltier elements are used in camping, portable coolers, cooling electronic components and small instruments. The cooling effect of Peltier heat pumps can also be used to extract water from the air in dehumidifiers. A camping/car type electric cooler can typically reduce the temperature by up to 20°C (36°F) below the ambient temperature. With feedback circuitry, peltiers can be used to implement highly stable temperature controllers that keep desired temperature within +/-0.01 Celsius. Such stability may be used in precise laser applications to avoid laser wavelength drifting as environment temperature changes. Climate-controlled jackets are beginning to use Peltier elements.[9][10] Thermoelectric coolers are used to replace standard heat sinks for microprocessors because they actively cool the module while heat sinks only provide passive cooling.  Wink

Posted on: May 26, 2014, 07:04:05 pm
with advances in  l ion battery tech battery weight is not as much a factor as it used to be so running  higher current and voltage  to get more  depth is  more expensive than lead  but doable. 

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,56782.msg275756.html#msg275756




Logged
Offline Mudflap
Knight
Gold Member
*

Join Date: Apr, 2010
Thank you92

Activity
0%

United States
Posts: 1864
Referrals: 0

9300.00 Gold
View Inventory

Awards
« Reply #44 on: May 26, 2014, 07:32:31 pm »
Go Up Go Down

We had them 20 years ago in locomotive cab fridges. Ran at 72V and drew a lot of current. With the 2700 hp diesels they didn't worry about the current. Smiley Of course when you make cool you also have to get rid of the corresponding heat.

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,56782.msg275757.html#msg275757




Logged
Offline WM6
Knight
Copper Member
*

Join Date: Oct, 2010
Thank you4

Activity
0%

Slovenia
Posts: 72
Referrals: 0

365.00 Gold
View Inventory

Awards

Tesoro Euro Sabre II
« Reply #45 on: May 26, 2014, 07:57:49 pm »
Go Up Go Down

Hi golddustcarl

You say: "Do not use derived power supplies.". What here exact mean "derived"? That "Do not use something like step up or step down converter"?

Suppose that "derived" is not related to regulated power supply?
I am planning to use 12V battery pack, so I need 10V and 5V voltage regulators too.

Do you have your proposal of 12V power supply in schematic? Thanks.

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,56782.msg275759.html#msg275759




Logged

Global capital is ruining your life?
You have right to self-defence!

Offline Mafia
Foil
*

Join Date: Feb, 2013
Thank you0

Activity
0%

Iran, Islamic Republic of
Posts: 1
Referrals: 0

10.00 Gold
View Inventory

Awards
« Reply #46 on: May 29, 2014, 11:57:01 am »
Go Up Go Down

hello.my name is fardin
I wrote a program that frequencies of 480 Hz to 288/571 Hz was converted Wink
I am currently working on I do goldscan 4  Kiss

Posted on: May 29, 2014, 11:54:40 am
Is there anyone who can help me ?
 Smiley


Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,56782.msg275800.html#msg275800




Logged
Offline GoldDigger1950
The Old Man and the Soil
Global Moderator
Platin Member
*****

Just call me GD.
The Old Man and the Soil
Join Date: Jun, 2009
Thank you225

Activity
0%
Male
United States
Posts: 11219
Referrals: 12

47848.00 Gold
View Inventory

Awards

Garrett Groundhog ADS, Garrett Sea Hunter, Bounty Hunter Tracker IV, Bounty Hunter Pioneer 505,Minelab Eldorado Mk II, Tesoro Compadre, Tesoro Tiger Shark & A Few Home Brew Detectors
« Reply #47 on: May 29, 2014, 01:54:11 pm »
Go Up Go Down

Our policy is not to delete posts but yours is not on topic. It seems to me there may be a language barrier so perhaps that's all that is amiss here.

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,56782.msg275803.html#msg275803




Logged

It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!

Offline WM6
Knight
Copper Member
*

Join Date: Oct, 2010
Thank you4

Activity
0%

Slovenia
Posts: 72
Referrals: 0

365.00 Gold
View Inventory

Awards

Tesoro Euro Sabre II
« Reply #48 on: June 03, 2014, 06:08:14 am »
Go Up Go Down

Hello golddustcarl,

Are you still active on this project? No more answers from you.

What was your solution for "new PI idea" power supply. Can you share schematic for your PS proposal with us?

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,56782.msg275879.html#msg275879




Logged

Global capital is ruining your life?
You have right to self-defence!

Offline johnny23
Knight
Copper Member
*

Join Date: Mar, 2014
Thank you18

Activity
0%
Male
Canada
Posts: 58
Referrals: 0

305.00 Gold
View Inventory

Awards

radio shack, garret ,minelab
« Reply #49 on: June 03, 2014, 10:28:49 am »
Go Up Go Down

That must have kept the Beer COOL  Wink

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,56782.msg275881.html#msg275881




Logged
Print
Pages:  1 2 3 4 5 6 7   Go Up
Jump to:  

Powered by SMF 1.1.19 | SMF © 2005, Simple Machines | Sitemap
Copyright THunting.com