Casper – a modern pulse detector on the microcontroller . Designed to search for metal objects in the ground , the sand, the walls, the thick grass , etc. The principle of action of the pulse detector Casper is based on the excitation of a metal object pulsed eddy currents and measuring the secondary electromagnetic field, which induce these currents . Then it analyzes this re-radiated signal and produces an indication of the detected object .
Technical characteristics of the metal :
The maximum depth of detection of objects ( in the air ) :
Coin 25mm in diameter – up to 30 cm ;
Bucket – up to 60 cm ;
The maximum depth of detection – up to 160cm ;
Continuous operating time on battery 1.2 a / h :
– Economy Mode – 20 hours ;
– Using the TURBO 1 – 8:00 ;
– Using the TURBO 2 – 5:00 ;
Weight – 2.3 kg;
Before turning the metal detector , you must remove the sensor on the 30 – 40cm from any metal objects and ground and turn the power switch , which is located on the front panel. Further control is performed using a metal detector sensitivity control , volume buttons and switch the balance of power. The device may set the power level three . To switch the power switch is set to three positions. The middle position ECONOMY mode . The situation down – TURBO 1. Standing up – Turbo 2 . With increasing capacity increased depth of detection ( approximately 20 %) and reduced operating time on battery (approximately 2-fold) . So keep that in Turbo Mode 2 battery mud discharged for 5 hours .
Getting to seek to lower the sensor to the ground at a distance of 3- 5cm. Then you have to press the BALANCE . For some time (typically 3 seconds, the new location is not more units of seconds ), the device will make adjustment . During the adjustment of the instrument displays the voltage on the battery mud by flashing LEDs. The principle of the following indications – two LEDs blink always the first and last ( when fully charged battery mud ) . As the discharge in the penultimate position of the last flashes , etc. with a discharged battery mud will blink first and second light-emitting diodes with a further discharge device stops working and plays only a busy signal .
After the end of the balancing device is ready to search. In this mode, the LEDs indicate the signal level of the metal. The more metal and the closer it is to the sensor , the greater the signal and the larger number will have a burning LED. Also, together with the signal level will change the tone and volume of the audio signal. Now you need to set the sensitivity . Turn the sensitivity of the far right , and then turn the knob to the left until then, until no false positives.
We can start the search. Metal operates in static mode. Therefore, the sensor can be moved over the ground with any comfortable speed. Upon detection of a metal object will trigger a visual and audible indication . Slowly moving the sensor above the target with visual and audible indication can be defined place on the ground, in which the signal maximum . With high probability it can be argued that the center of the target is in the ground in this place . The exception is the target of complex shape. During the search , if necessary, be repeated balancing ( zeroing ) of the device by pressing the BALANCE . After switching the power balance is always repeated by pressing the BALANCE .
To charge the battery must be disconnected from the supply connector electronic control unit and plug it into the charger connector . The charger must be connected to the network ( 220V, 50Hz) . Time charge a completely discharged battery mud 10 houes. To prolong battery life, we recommend storing it in a charged state .
For the manufacture of the coil can be used PVC water pipe that is glued together with its ebbs special glue for this pipe . For one coil to the three segments of 250 mm, 110 mm by two , four corners and a tee ( fixing rod ) all ½ inch diameter . From these pieces glued square. For bonding is not necessary to buy a special glue, and the SEC suit in small tubes . After the glue in the four corners of the outside of the drilled hole diameter of 10 mm . Near the tee just drilled a hole for the output ends of the coil. Through these holes with a needle wound coil . The ends of the wire are displayed in the hole near the tee . Taped over the holes in the corners of the plugs or building filled with sealant. To maximize the sensitivity of the metal wire in the coil assembly to be stranded in the plastic insulation such as MF -3 , MF -4 -section 0.35 mm . With the worst result fits with the winding diameter of 0.56 – 0.68 mm . Number of turns in coil about 25 . For winding requires about 25 meters. If the number of turns will be different , the metal detector when you press RESET is automatically set by the current number of turns. To connect the coil unit is suitable network core wire diameter of 0.75 mm . Shield coil and connecting cable is not necessary. We have constructive coil has very good strength .
Wiring the board : The coil connector is connected to the terminals 13 and 14 of the metal board . Lead acid battery mud voltage of 12 volts and a capacity of 1.2 A / W through the power switch is connected to the terminals 16 – (MASS ) and 15 – ( 12 ) . Speaker impedance of 50 ohms is connected to terminals 1 and 2. Variable resistor to control the sensitivity of the resistance of 5 ohms to 10 ohms with a characteristic “B” – ( a linear characteristic) is connected to terminals 7,8 – control output and 9. BALANCE button (make) is connected to the leads 10 and 11. Variable resistor to adjust the volume resistance of 5 ohms to 10 ohms with a characteristic “B” – ( it is linear) is connected to terminals 3,4 – control output and 5. When connecting a resistor, cut the jumper on the board between terminals 3 and 4. Toggle switch on the power switch is connected to the three positions 6 and 9 of the findings of the board:
– Minimal power – between terminals 6 and 9 are not connected to anything
– Average power – between terminals 6 and 9 10k resistor connected
– Maximum power – terminals 6 and 9 are closed.
Suitable for the manufacture of rod the same diameter PVC pipe ½ inch or 1 inch . The printed circuit board is designed by Polish Corps Z- 34. Here seems to explain everything to your court . I love this metal detector , if still not reducing the voltage to 11 volts, which displays the operating status of the MD . The author recommends the use of the battery , but the pleasure is worth about $ 10. I went the other way – in the radio market , and at the most , have the old batteries from cell phones . Of them and put together a 12- volt battery . I really had enough for 5 hours.
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