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Today I made some experiments.
My lamp was still the same (125W mercury) at a distance of 40cm from the PCB.
As you said, 20 minutes was WAY too much time and I decreased it at 5 minutes.
I made a few experiments and I tested the quantity of the NaOH in the water.
Also, (i will back with more...
This morning I put 55g in 500mL water(it was not saturated), and when I sank the PCB into the water, the exposed surface turned into purple colour instantly. I am assuming that I should put ~20g NaOH in my mix, in order not to do it so reactive.
Then , I cleared it with water and when I put my...
Thank you very much sir!
An other question that I have is the correspondence of the NaOH in the water, after the PCB exposure to the light. 1L of water corresponds to -?- NaOH?
Hello guys!
I'm trying to manufacture a PCB with the UV lamp method.
I have a simple (possibly) question.
Before exposing the pcb to the lamp, is it really needed to warm up the lamp first?
I'm asking because if I have to then i come up with the following scenario:
Outside of the room I turn...
Hello.
I'm gonna try the toner-iron etching technique.
One friend of mine told me that 1L water needs 100g ferric chloride. Is this true? Any other suggestions?
Thanks a lot and regards!
I just want -30dB or less S11 between port 1 and port 2. Nothing more nothing less.
The main problem here is the step, i didnt say the opposite. I'm trying to MINIMIZE the parasitic capacitance caused by the step. Any suggestions?
Cascading different lines is the same as step in width because...
Not good means the s11 is -15 - -20dB at my operating frequency.
I want it to be at least -30dB - -35dB.
I simulated the picture that i uploaded in my first post, fr4 substrate(er = 4.6, tand=0.018) and PEC on the bottom side(same dimensions as the fr4).
I want to minimize the parasitic...
Hello guys.
I have a problem.
I'm designing a microstrip line and I have to put a step between two different lines as you can see in the uploaded figure.
The simulated results are not any good and i want to ask if anyone knows a solution to this problem. Possibly a cut or whatever.
Thank...
Hello,
I exported my designed antenna as gerber file and imported it in Gerbview.
Although, I have put A4 dimensions in Gerbview and printed it with A4 dimensions as well,
the schematic on the paper isn't correct. It has 0.5mm divergence and this is a crucial problem for my design.
Any...
Hello to everyone!
Because I have seen many opinions about input impedance and mutual impedance on CST, I want to clear this out and however this will be a precious thread for other members too.
Imagine that you have simulated an antenna on CST and lets also imagine that in the navigation tree...
Hello guys!
I have a problem. I'm designing a patch antenna array. I'm feeding the antenna with a microstrip line with a characteristic impedance of 50ohm.
My problem is that when i increase the length of the microstrip line i have serious oscillations in s11(RL).
Serious meaning that s11 is...
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