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C-Scope delay settings ?

A

Anonymous

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I am trying to find someone who might know the lowest delay setting on my C-Scope CS7UMD. I heard the Aquastar could be set as low as 10uS. Would like to know how my PI compares. Thanks, Mark
 
Hi Mark,
The lowest delay setting on your C-Scope CS-7 is 15 useconds. I happen to own both the Aquastar and the CS-7. Are you aware that you can use your Frequency control on your CS-7to tell if the target may be gold?
Terry in Hawaii
 
have used the c-scope cs 6pi before and thought that the audio sound was to low,but it seemed like quite a good machine.
just wondered what the cs-7 was like
 
Hi James,
Since there is no way to really compare gold rings because they come in many different sizes and karats. I always use a nickel to compare for depth on a PI machine. My CS-7 will get 11 inches on a nickel. But then I have installed a set of good headphone on my CS-7 because the stock CS-7 headphones do not have much volume.
Terry in Hawaii
 
I have a CS 7 also and I agree it sounds too low.
There is a volume control behind the battery compartment- read the manual -
Altough the sound is to low for me I never attempted to increase it, but it is possible.
 
I have a CS-6 and on a nickel 11" is just about right in air test or on the beach here in Daytona Beach Fl. in wet salt sand, also my CS-6 audio is fairly strong but flat and without a sharp increase but ok. What control is hidden in the small plug cover in the arm cup. Is this the audio you spoke of.
 
While I do not know any thing about the CS-6. The first CS-7 did not have a internal adjustment to increase the audio volume because they had headphones that had more volume. Only problem was that these headphone's cable would leak. So to solve this problem. They went to a different headphones that had very low audio volume. And to solve this problem, they installed a little internal circuit board to increase the audio volume. In my case with my poor hearing, this still was not enough. So I installed better headphones.
Terry in Hawaii
 
I have the CS6PI and found it to have low audio. In the UK they have a public health law that limits the maximum output to headphones.
Because of this, the CS6PI just has a larger series resistor than normal U.S. made detectors. I believe it is about 270K or even larger (my memory for trival detail is failing). If you open the battery box you will find a resistor attached to the headphone jack. That is the one! Just solder another lower value, such as a 47 ohm, resistor in parallel with it. It should give your ears a good jolt on a shallow target with sensitive headphones. Use a 68 ohm resistor for a little less volume or go as low as 10 ohms for a real blast. I would not short the resistor out as you should have some isolation in case the headphones short out. This is protection against blowing out the final amplifier.
For those who want to drill holes, you could always mount a small toggle switch in series with the 47 ohm resistor or external volume control (500 ohms) in parallel with the 270 ohm resistor to have some adjustment. There should be enough space in the battery assembly.
Once you do this mod, you will not complain about low audio again! Remove the batteries, look for all screws and carefully disassemble. The battery compartment slides off the shaft and the housing comes apart giving easy access to the series headphone power limiting resistor to be jumped with another one as explaind above.
Anyone doing this mod, let us know how it works out.
PS
When you first turn on the CS6PI, keep the headphones off your ears till the machine adjusts to the ground. With sensitive (110db/meter) headphones, you could get quite a blast! Then, adjust the threshhold for a faint background hum. Run the frequency fully counterclockwise for best response on gold and nickles.
Low impedance headphones should work better (meaning louder) as there is a better match to the output stage. High impedance headphones (150 ohms will be a little better but not improved as much a lower impedance headphones.
bbsailor
 
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