basic tester

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Playing with graffite to get a potenciometer I found one form to maintain graffite on paper, even in plastic.

Adding Iodine ensure the hardeness of this

At the left without Iodine and rubbed and at the right with Iodine and rubbed too

with and without

you can see iodine on the edges

Maybe It can be used for 3d printings or air bearings

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09/02/2021

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09/04/2021

NAND gates by using AC phases with no active elements? 
Teorically delay by active components would not exist (combinational). 

The half adder is the next to try :D

... ...

not NAND at this but I will continue trying

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09/06/2021

I'm going to make two instrumentation amplifiers with OPAMPs to have differential probes to get the diode curves that also can be usefully to be able do some test over my custom compounds and know if I have some something interesting :)

09/07/2021

TL084 as instrumentation amplifier and voltage reference

09/08/2021

Better results with symetrical source. Even with capacitors I have something like a diode curve. I have put a little more impedance to test this function generator but also I get nice sensibility without them for other purposes

forward diode

reverse diode

conductor

insulator

capacitor

inductor