Superscan PI

[ZOUjiarui]

[ZOUjiarui]

What's the problem? Make it impossible to work? What a headache.

[GeoMax]

Hi ZOUjiarui,

maybe you could share the schematic you draw and used for your PCB. I do not mean the hand drawn circuit which is uploaded already here in the forum. By the way there are at least 3 different diagrams known to me and maybe more floating around here. It could be possible that you have an error in your drawing. You can not expect that people to trace your PCB to find the problem. That is to much work, but a look at your schematic its easier.

Geo Max

[ZOUjiarui]

Hi ZOUjiarui,

maybe you could share the schematic you draw and used for your PCB. I do not mean the hand drawn circuit which is uploaded already here in the forum. By the way there are at least 3 different diagrams known to me and maybe more floating around here. It could be possible that you have an error in your drawing. You can not expect that people to trace your PCB to find the problem. That is to much work, but a look at your schematic its easier.

Geo Max

Hello.
I used this hand-drawn schematic that I uploaded, and it is almost error-free, but some details are not clear.

[ZOUjiarui]

I'm trying to find all the mistakes in the PCB

[ZOUjiarui]

Unfortunately, the tips given by experienced people are very few and even misleading. Maybe they spent as much money on super scan pi as I did.It's not weird.

[GeoMax]

Hi,
so you say you used one of the hand drawing which a loating around. Yes they are "almost correct" but only almost... I know of about 4 different SuperScan circuits and all are slightly different. So no wonder... How have you drawn the PCB? What software you are using? The correct way is first to draw a schematic (and run an ERC (electrical rule check)) than convert the schematic into a PCB and than place the compnents within the board outline. After placing the components, you can use either an auto router or you route your PCB by hand. And guess... run after finish routing a DRC (design rule check) on your PCB for errors. Thats the way how to do it. Everything else is not professional. Another tip is DO NOT BELIEVE EVERY CONNECTION YOU SEE IN THE SCHEMATIC IN THE FIRST PLACE. Always question it and check whether it could be correct or not with other similar circuit parts. Check also IC's and transistor for correct PIN connection but you should do it ACCORDING TO THE MANUFACTURERS DATA SHEET ALWAYS. That helps a lot in avoiding errors. In the past 20 years, I have seen so far only a few of hundreds of detector schematics which were 100% confirmed error free.

GeoMax

[GeoMax]

Hi,

a free software to make PCB's is KiCad. Check it out. If you need one with more professional features try Diptrace. There is also a limitated free version available.

@To all all other readers....
Would be interesting to hear what kind of software you use to draw schematics and to make PCB's.



GeoMax

[Carl-NC]

I used this hand-drawn schematic that I uploaded, and it is almost error-free, but some details are not clear.

You are using a schematic that is "almost error free" and "some details are not clear"? I think it would be a miracle if it did work. The schematic is a mess and unreadable. How about drawing a clean schematic of what you actually built, and then maybe someone can help.

[ZOUjiarui]

The third manufacturing failed.
Forgive my unprofessionalism.

[ZOUjiarui]

I took out everything I had.
response The potentiometer is 220 K with a 100nf in parallel
Transistor 214 pin 184 needs correction
The bottom right diode is 4148.
I hope I can help people who want to make it as much as I do.

[GeoMax]

A general question to Carl,

and this might interests other readers as well...

If someone make for exampe based on the "SuperScan" hand draw schematic a replica of the SuperScan and want to sell it commercially. Is this a copyright infrigement? Or is it a "grey zone" because nobody can prove it that the hand drawing is an exact copy of the SuperScan detector. The SuperScan is just used as an example it could be any other detector circuit.

Next Question.
How about the Geotech MiniPulse. The original design of the Mini Puse is an Eric Foster design. The circuit was traced from an old Mini Pulse detector circuit board, but modified. Is this "Geotech Mini Pulse" also a copyright infrigment?

Best regards
GeoMax

[GeoMax]

Hi ZOUJiarui,

why do you want to make the SuperScan? What things you want to detect with it? And which technical feature of the SuperScan is the reason why you want to build the detector?

GeoMax

[Carl-NC]

Copyright applies to a company-drawn schematic, not the design itself. It would be copyright infringement to post an original SuperScan schematic to the forum. It would not be copyright infringement to post a reverse-engineered schematic. It is also not copyright infringement to build or even sell a copy of the Superscan, even if an original schematic was used, as long as the original schematic is not disseminated. However, directly copying the PCB layout is copyright infringement as is copying micro code, if the design has a micro. Like schematics, PCB layouts and micro code are copyrightable. The only way to protect the design itself is via patents, and the design would need to have an inventive element in it.

[GeoMax]

Hi ZOUJiarui,

I had a quick look at your PCB.... What is the purpose of the LM337 in your PCB? The LM337 in the hand drawing does not make sense to me. In other SuperScan drawings is NO LM337 seen at all. This is what I mean in one of my previous posts. Always question the circuit and DO NOT BELIEVE ALWAYS EVERY CONNECTION YOU SEE IN THE SCHEMATIC.

By the way, some of your cpacitors connected to 24V have a voltage rating of 25V. Within the 24V rail I would use at least capacitors, with 35V rating.

GeoMax