Revisiting some "old" ideas from 1970's - IPS, OPS

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#262
thimios said:
I found 2N5088 ,I must ask Vallery if is it suitable for using here?
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Hi Thimios,

2N5088 is ok for the purpose - it's a slightly "simpler" version of 2N5089.
Slightly less gain and very slightly more noise. Not important for this design though - this is not a mic amp or a phono stage 😉

Datasheet for both of them is attached (ON Semi public access).

Cheers,
Valery
 

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#268
still4given said:
Sorry, I should have been more clear. I first print out the image on a plain piece of paper. Then I cut a piece of the contact paper slightly larger than the image, peel the back off and cover that image with the contact paper and run it through the printer a second time. The image is now applied to the surface of the contact paper. Next, I center the board over the image, foil side down, and tape it in place. Flip it over and apply the iron on the highest setting for about 1 to 1 1/2 minutes until I see the paper begin to tan. (This part may take a little practice depending on the temperature of your iron). Next douse the board in cold water to set the toner. Now peel away the paper and you should be left with a clean transfer with little or no toner remaining on the shelving paper. I use the same process for transferring the silkscreen image.
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Hi ok. I have read elsewhere about this transfer method. I manage to get the toner ( HP) on the board but found it is not a proper resist. I use HCL+H2O2.
 
#275
Valery,

I want to order Ampliwire ECC88 what would be your choice between the 2 under....two layer as is it the same price....?

15120507445112463313808589.jpg


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Marc
 
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