What capacitor?

[Pagan]

Hi I hope you can help me. This is my first time on this forum so I hope I've posted in the correct place.
I'm relatively new to to dark art of electronics.
After my detector( the pw seekit) that I built while at college I the late 70s was damaged beyond repair last week by a leaking workshop roof, I've decided to build a new detector, I've decided on a induction balance design from the 80s,as like the seekit it's simple,
The problem I have is the substitution of polystyrene capacitors, while they are available, there not available locally ( like to support local traders).
What would be a good substitute, mylar? Ceramic? Or tant.?
An ex electronic engineer told me its not the material that maters its the value and voltage, I'm not convinced, what's your recommendations??

[Qiaozhi]

Originally Posted by Pagan

Hi I hope you can help me. This is my first time on this forum so I hope I've posted in the correct place.
I'm relatively new to to dark art of electronics.
After my detector( the pw seekit) that I built while at college I the late 70s was damaged beyond repair last week by a leaking workshop roof, I've decided to build a new detector, I've decided on a induction balance design from the 80s,as like the seekit it's simple,
The problem I have is the substitution of polystyrene capacitors, while they are available, there not available locally ( like to support local traders).
What would be a good substitute, mylar? Ceramic? Or tant.?
An ex electronic engineer told me its not the material that maters its the value and voltage, I'm not convinced, what's your recommendations??

You should probably be in the Geotech forum at www.geotech1.com/forums
The LongRangeLocators forum is for ... long range locators ... and I suspect that's not what you're looking for.

[Pahom]

Originally Posted by Qiaozhi

You should probably be in the Geotech forum at www.geotech1.com/forums
The LongRangeLocators forum is for ... long range locators ... and I suspect that's not what you're looking for.

Why not one, just think it's a normal question regarding the normal operation of the instrument far obnoruzheniya. Good and stable operation of the LRL depends on good and high-quality parts .

[WM6]

Originally Posted by Pahom

Why not one, just think it's a normal question regarding the normal operation of the instrument far obnoruzheniya. Good and stable operation of the LRL depends on good and high-quality parts .

It is not LRL, it is about very known ETI schematic of IB design, posted at Geotech too:

https://www.geotech1.com/pages/metde...i549au_300.pdf

Mylar C are apropriate substitution.




.

[Pahom]

Yes, I understand that it's not a FISH, but Otechestva details depends on a good job any device. Thank you for the full description of the MD scheme.

[Pahom]

Originally Posted by Pagan

Hi I hope you can help me. This is my first time on this forum so I hope I've posted in the correct place.
I'm relatively new to to dark art of electronics.
After my detector( the pw seekit) that I built while at college I the late 70s was damaged beyond repair last week by a leaking workshop roof, I've decided to build a new detector, I've decided on a induction balance design from the 80s,as like the seekit it's simple,
The problem I have is the substitution of polystyrene capacitors, while they are available, there not available locally ( like to support local traders).
What would be a good substitute, mylar? Ceramic? Or tant.?
An ex electronic engineer told me its not the material that maters its the value and voltage, I'm not convinced, what's your recommendations??

To give you advice on the details, you need to see the diagram .Where and what place you need to put the tape where it is possible and easier for the capacitor to deliver. And so here on the forum of clairvoyants I personally do not know.

[Pagan]

The capacitors in question are
C5
C6
C14
C15 and 16
Thanks

[Pahom]

Yes, an interesting scheme, Thanks! And so.... I would put Polystyrene or film. If there is desire to muster on SMD the stavte all NP0 and you can dig modicum under -30

[WM6]

Originally Posted by Pagan

The problem I have is the substitution of polystyrene capacitors, while they are available, there not available locally ( like to support local traders).

Sometimes reseller even do not know what they have, par example:

Not only this is polystirene capacitor:



But this too:




and this too:





Or this:





as well this: