GSK-944 Data Sheet Datasheet by Global Specialties

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Water Resistance Checker (basic)
Model GSK-944
This checker utilizes resistance to measure dissolved solids
in water. The more resistance, the less conductive the water;
as resistance levels lessens the materials that conduct
electricity are elevated. Results are displayed by a series
of (8) LED’s.
Technical Specifications
nPower source: 9 VDC
nLED resistance level indicators: 7
nLED on/off indicator: 1
nLevel adjustment: 3 levels
nPCB dimensions: 2.78 x 1.79 in.
Operating Principles
The more resistance in water the less dissolved solids, such as
minerals, are present. Conversely, as resistance decreases
the level of conductive material in the water increases. A series
of (green, yellow, and red) LEDs indicate the level of resistance
(Greenhigher through Red lowest) the more LED’s lit the
less resistance. There are 3 switchable levels (see Figure 1
resistance table).
Circuit Assembly
Please refer to Figures 1, 2, and 3 for aid in component
placement. It is recommended to start with lower components
i.e. diodes, resisters, electrolyte capacitors, and transistors.
Be careful to check polarity before soldering. If a problem is
detected it is best too use a desoldering pump or desoldering
braids to remove component. This will minimize potential
damage to the printed circuit board.
Testing
Connect the battery to provide power to the circuit. The LED
power light will come on. Slide switch “SW” to position “1.”
Insert probe into water source, LED 1 through LED 8 will
display level of resistance in water source.
Troubleshooting
The main cause of problems will come from misplaced
components or faulty soldering. Utilize Figures 1, 2 and 3
to ensure proper placement, polarity and then check solder
points for connectivity.
Accessories
Use GSB-03 (sold separately) to house the PCB and batteries.
Electronic Kit Set for Hobby & Education
Figure 1 Water Checker Circuit
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Position 1
Switch
8 0.98 kΩ
7 2.48 kΩ
6 4.41 kΩ
5 6.97 kΩ
4 10.57 kΩ
3 15.96 kΩ
LED Water Resistance
Position 2
8 18.83 kΩ
7 33.80 kΩ
6 53.06 kΩ
5 78.74 kΩ
4 114.61 kΩ
3 168.61 kΩ
2 258.48 kΩ
1 438.22 kΩ
LED Water Resistance
Position 3
8 197.26 kΩ
7 347.04 kΩ
6 539.62 kΩ
5 796.39 kΩ
4 1,155.86 kΩ
3 1,695.08 kΩ
2 2,593.77 kΩ
1 4,391.16 kΩ
LED Water Resistance
Figure 2 Connecting Circuits
GSK-944
Resistors
R1, 30 1 kΩ brown – black – red – gold
R2, R8, R11, R14, R17, R20, R23, R26
10 kΩ brown – black – orange – gold
R3 100 kΩ brown – black – orange – gold
R4, R6, R9, R12, R15, R18, R21, R24, R27
1 MΩ brown – black – green – gold
R5, R28 20 kΩ red – black – orange – gold
R7, R19, R13, R16, R19, R22, R25, R28
5 kΩ green – black – red – gold
R31 3 kΩ orange – black – red – gold
Electrolytic Capacitors
C1, C2 33 µF
Diode
ZD1 5.1 V
Integrated Circuits
IC1, IC2 LM339
Figure 3 Installing components

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