Hello Hans,

I was a little bit irritated about the various comments concerning future PCB boards.

Your project is not a one night stand. It is here to stay and to get developed by you and the community.
So I would vote for a clear revision history of the boards and the documentation. Print the revision number on the board and on the files and print them in the correct way so that lazy or knowing people can solder as indicated and don't have to struggle with mental corrections.

On the subject of heat sinks I am biased. These transistors are build to like some heat ...

72 de
Hajo dl1sdz

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... indessen wandelt harmlos droben das Gestirn
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开云体育

On 19/05/2013 22:30, Hajo Dezelski wrote:

I was a little bit irritated about the various comments concerning future PCB boards.

Hi Hajo

I see your point but but I see it totally differently. The board layout and silk screen is not WRONG and does not need alteration which would cause confusion. Everything is correct for the 2N7000, the BS170 can be supplied as an alternative and adequate information is provided for the correct orientation of this substitute.
We can only get irritated with the manufacturers of the devices if we wish lazy people to be able to mindlessly thrust devices in any way round.

Heat sinking as you say is not essential and dissipation can be dealt with by extra devices inserted in the positions provided.

73 Eddie G3ZJO

To quote from Wiki:-

The 2N7000 and BS170 are , used for low-power switching applications. The two are nearly identical except that the leads are arranged differently and the current ratings are somewhat different

I started the 2n7000 wikipedia page!

Leigh/WA5ZNU