[Power supply for AMP in CAR]

OK, suppose we have four transistors in parallel and we like to switch say10 Amp@12 Volts.
The transistors are not exactly the same (not from the same batch) but we want to use them anyway.
The first has 0.2 V drop the second 0.3 the third 0.25 and the last 0.25.
This does not mean that all the current runs through the first one whit the lowest resistance sins they are all in parallel.
If we add resistors to each one of the transistors we also add further drop (0R1 X 2.5A = 0.25V) if the transistors had been equal.
Can you explain the reason for the resistors by adding info on the following drawings, please?
Sorry for being a pain in your neck, but I think debating things like this is very stimulating.
Just stop me when I become too much! ;D
The (Swedish) mule!

Ante ::)

[Power supply for AMP in CAR]

Hi MP & hotwaterwizard !

I, we checked the link and it was nice reading, lots of good thinking and valuable info. But this project is a linear one and stubborn as I am :)I still state that switch mode is very different from linear. You don

[Power supply for AMP in CAR]

Hi MP.

I agree to that, but even if one resistor (transistor) is smaller they are all in parallel. I don

[Power supply for AMP in CAR]

Hi MP.

I

[Build a simple PC oscilloscope]

Here is an attenator for pc oscilloscope that is used for soundcard input but it will probably be possible to apply in this case. The site is in Norwegian but the schematic is pretty simple.
http://home.online.no/%7Esondred/Gamle%20sider/attenuator.htm

Ante ::)

[metal detector]

Here is a good place to start, containing a lot of info on metal locators.
Lots of schematics and even a forum.
http://www.thunting.com/cgi-bin/geotech/pages/common/index.pl?page=metdet&file=schematics.dat
Good luck!

Ante ::)

[metal detector]

Hi!

Did this

[Convert 0-30V 3A PSU to 5A or more]

OK, I got the hint ;D
We go linear on this one. :'(
Where are you Staigen!

Ante ::)

[0-30 Vdc Stabilized Power Supply]

Check R16. ::)

[Convert 0-30V 3A PSU to 5A or more]

I have been following this project for some time now and I think all the problems with heat, SOA, big expensive heatsinks, double fans and so on can disappear by going switchmode. This is more economic, much higher efficiency, lover component count and a lot less heat. And it will fit in a smaller case too. ::)