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I am working on the schematics of this detector from China.
He is sold under a lot of names, i found so far this different names
GC-1018
GTX9055
Supreme M60
L23BK
ARW1018
advertisement for this detector:
This is to optimistic 
,
Yup this is correct
I don't recommend for buying one, there are better one's, bud for the fun to see if i can make this detector better, and becourse there are only a few schematics from Gold Century detectors, i reversed engineered the schematics
This detector looks good, so is the PCB, but if you look closer at the components used, then there is a lot of room for improvement
Now some patience, I have the schematics, but on paper on different sheets and have to combine them to a digital drawing
I can give already details, it looks like they have used parts from Tecnetics Big Bud Pro or Compass Coinscanner Pro
He is sold under a lot of names, i found so far this different names
GC-1018
GTX9055
Supreme M60
L23BK
ARW1018
advertisement for this detector:
The Gold Century Model GC1018 Advanced Metal Detector is a top quality metal detector and the most sensitive of all the Gold Century detectors. The advanced features of this unit will allow you to find treasure that others have missed! This model is intended for the experienced treasure hunter who demand high performance and extreme sensitivity.
The meter will indicate the type of metal found.
Many of the advanced features of this unit will not be found in any other detectors at any price.
The Carbon Fiber lower shaft and unbreakable Nylon connecting hardware significantly increase the sensitivity of this unit by keeping all unnecessary metal parts as far from the detection coil as possible.
The waterproof coil will allow you search in shallow water at the beach where most Gold rings are found.
The meter will indicate the type of metal found.
Many of the advanced features of this unit will not be found in any other detectors at any price.
The Carbon Fiber lower shaft and unbreakable Nylon connecting hardware significantly increase the sensitivity of this unit by keeping all unnecessary metal parts as far from the detection coil as possible.
The waterproof coil will allow you search in shallow water at the beach where most Gold rings are found.
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Key Specifications/Special Features:
- Lower half of shaft is non metallic to reduce interference and increase sensitivity.
- Shaft has both preset click to extension settings and a can twist lock for rock steady control.
- Rugged design and comfortable handle with arm brace.
- Shaft colapses for easy transport and storage.
- Power: 8 x AA batteries
- Operation mode: non-motion for all metal; motion for discrimination
- Control switch: volume, ground balance
- Working frequency: 6KHz ~6.8KHz
- Operating frequency: 6KHz ~ 6.8KHz
- Audio frequency: 360Hz ~ 440Hz
- Search Coil: 9 1/2 inches
- Pinpoint function help to find the accurate place of target
- Ground balance function enables user to find a balance point
- Target indications: 4.3 inch viewmeter, 2 inch speaker, 1/4 inch earphone jack
- All metal mode: maximum sensitivity >=10 inches for an US quarter; viewmeter shows intensity; able to detect ferrous and non-ferrous metal
- Discrimination mode: maximum sensitivity >= 9 inches for an US quarter; auto ground balance; viewmeter and audio indicate metal type
- Low battery indication
I don't recommend for buying one, there are better one's, bud for the fun to see if i can make this detector better, and becourse there are only a few schematics from Gold Century detectors, i reversed engineered the schematics
This detector looks good, so is the PCB, but if you look closer at the components used, then there is a lot of room for improvement
Now some patience, I have the schematics, but on paper on different sheets and have to combine them to a digital drawing
I can give already details, it looks like they have used parts from Tecnetics Big Bud Pro or Compass Coinscanner Pro
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