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It is so simple....i must make it. But just searched internet. Is there any "human" substitution for that ic? Not possible to find it in local shops...
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It is also a non-motion detector.
how Viking works. it is tuned on constant tone (I think this is not good). the tone falls down on ferrous metal and increase up on non-ferrous metal.
be honestly I am very surprising that the schematic is so simple...
Viking has good sensitivity, BTW.
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Mini V5 , 3x5cm.Not checked.Grt Nakky.Comment
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WANTED: VIKING 5D
CA3094e , It is a very old I.C. , almost as old as me
!!! $1.46 each from Digi-Key , It is becoming very rare !! Look for a Substitute soon before it is too late !..............Eugene52
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Yes, i saw datasheet already.
There is always some catch!
This project doesn't makes sense if ic cant be obtained, which is the case here, at my country. Pitty.
This is not serious project at all, yet first time i saw its simplicity, i got idea to make it as compact as possible and use it as pinpointer... Pitty...
But this is good idea for those who can find this obsolete ic. Go for it!Comment
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Here is the schematic and the annotated layout.
This design is quite interesting, as it's not immediately obvious how an audio tone is generated in the speaker/headphones. The TX oscillator does not produce a continuous sinewave, but instead generates bursts of oscillation at around 100KHz. The rate at which these bursts are produced is approximately 170pps, and it is this lower frequency that is heard by the user.
In some ways this design is a simplified version of the Heathkit GD-48, which also used a modulated TX oscillator. However, the Viking uses a DD coil, whereas the Heathkit used an omega.
The tuning cap is used to fine tune the phase-relationship between the transmit and receive coils, allowing the discrimination setting to be adjusted. You need to use a non-metallic trimmer, and adjust it so that a large nail is rejected.
These detectors are so cheap to buy, that it's not really worth the effort to build one yourself.
Also, I think there are some capacitors in the search head (not shown in the schematic) that makes it difficult to measure the coil inductances accurately.Comment
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WANTED: VIKING 5D
Ivconic , I am not building this one !!!!!!! I have 3 other projects that I started over a year ago , and I still have not finished , sheeeesh....... I am so far behind in everything , I have a big un-touched "To Do List" . My other Hobby is a English word called "PROCRASTINATION" ............This year 2009 I Promise I will finish Everything !!!!
..............Regards..........Eugene52
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Hi Eugene ,go to scanned copy on the top in Sprint on the right,than load bidmap, must be a BPM file scan or pic,than you can trace it over.I hope you can understand me.Grt Nakky.Originally posted by Eugene52 View PostComment
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WANTED OR NOT WANTED: VIKING5 ???
Thanks Nakky , the .bmp files are the biggest size of any image format , meaning they are like a High-Definition file so sprint can convert it to a .lay image with more precision . But this Viking5 here seems like a T/R -I.B. Combo and seems they copied from Whites beachcomber AF-101 ???? It is fine that someone wants to work and study the Viking5 here . But is the Whites here a better Detector even though it does not discriminate ?? Please , opinions are very welcome here , and I do not mean to change the subject !!! The good and amazing news is taking a .BMP image and converting it to a sprint .lay file !!!..........Take Care all..............Eugene52Originally posted by nakky View PostComment
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check the schematic
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Thanks KT315. At least someone is awake.
The COARSE and FINE controls were swapped over, and one resistor value was wrong. Updated schematic below.
By the way, in your version of the schematic, the audio transistor should be a ZTX712 (darlington), not ZTX512. Also, the search head contains 3 coils with a shared connection that is wired to the screen. The 3 coils are the TX, feedback, and RX. As I said before, the TX circuit is like a cut-down version of a Heathkit GD-48.
If you spot any other mistakes, please let me know.Comment
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AF 101
I got once a White's AF 101 with it's 6" coil: it's not worth its money: no iron rejection at all! I also opened it's coil housing: I only saw a single loop and no caps. FORGET IT!
There is are similar looking White's detectors on the website of White's UK: The Beachcomber 4 (BC 4) and the AF 109.
Both are all metal TR detectors with some built-in iron rejection (cf. Viking 5) and the AF-109 has the same circuit as the BC 4. The BC 4 is built nearly unchanged since 1978 or 1979 (the year I got my first BC 4). The difference between the BC4 and the AF 109 is the searchcoil size: BC 4-8 inches, 2D ; AF 109: 10 inches 2D. Both have inside the coil housing some caps and a variable cap of 80 pF. To get access to the variable cap, you have to drill carefully (!) a hole into the coil housing. The hole has to be drilled on the upper side of the BC4 coil and from the lower side on the AF-109 coil.
Modifying the variable cap setting has some incidence on the iron rejection level. If you try to reject iron too much, the detector becomes too ground sensitive.
In the late 70's, White's Beachcomber also sold an ultra cheap version with a 6" 2D coil called "Beachcomber-TR" and "Coin Getter". A fantastic little machine! Basically, it has the same circuit as the BC 4. Nowadays, it can be found for around 10-30 $. It is comparable to the Compass Coinhustler. The latest version of the Compass Coinhustler (around 1983) was available with an S-shaped stem and an 8" coil.
Back to the White's BC 4: it also works with a 4B coil of the earlier Beachcomber 6 or Coinmaster and Alaskan models, but it works best with the 2D coil.Comment
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AF 101
I got once a White's AF 101 with it's 6" coil: it's not worth its money: no iron rejection at all! I also opened it's coil housing: I only saw a single loop and no caps. FORGET IT!
There is are similar looking White's detectors on the website of White's UK: The Beachcomber 4 (BC 4) and the AF 109.
Both are all metal TR detectors with some built-in iron rejection (cf. Viking 5) and the AF-109 has the same circuit as the BC 4. The BC 4 is built nearly unchanged since 1978 or 1979 (the year I got my first BC 4). The difference between the BC4 and the AF 109 is the searchcoil size: BC 4-8 inches, 2D ; AF 109: 10 inches 2D. Both have inside the coil housing some caps and a variable cap of 80 pF. To get access to the variable cap, you have to drill carefully (!) a hole into the coil housing. The hole has to be drilled on the upper side of the BC4 coil and from the lower side on the AF-109 coil.
Modifying the variable cap setting has some incidence on the iron rejection level. If you try to reject iron too much, the detector becomes too ground sensitive.
In the late 70's, White's also sold an ultra cheap version with a 6" 2D coil called "Beachcomber-TR" and "Coin Getter". A fantastic little machine! Basically, it has the same circuit as the BC 4. Nowadays, it can be found for around 10-30 $. It is comparable to the Compass Coinhustler. The latest version of the Compass Coinhustler (around 1983) was available with an S-shaped stem and an 8" coil.
Back to the White's BC 4: it also works with a 4B coil of the earlier Beachcomber 6 or Coinmaster and Alaskan models, but it works best with the 2D coil.Comment
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This is true. The AF-101 is an off-resonance type detector, and therefore has no effective ferrous rejection. It's one step up from a BFO.Originally posted by AS (EU) View PostComment
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