JOTA-JOTI 2011 KIT
CONSTRUCTION DESCRIPTION SIGNAL FINDER
When this kit is built correctly, the signal finder can detect electrical noise sources. Electric
fields, which are transmitte by almost every electrical device, can be detected by the signal
finder. With the signal finder, the hidden world of electrical signals becomes audible!
The kit consists of an Small board and a number of electrical components. The kit can be built
for lefthanded or righthanded use.
Lefthanded
Righthanded
Step 1: Mount the switch in
position S1b
Step 1: Mount the switch in
position S1a
Step 2: Install the 3.5 mm jack
plug (headphone jack) at
position J1a
Step 2: Install the 3.5 mm jack
plug (headphone jack) at
position J1b
Then mount the diodes. Bend the wires for this purpose at an
angle of 90 degrees. Insert the wires through the holes on the
PCB. Note the line on the diode, which must match the printing
on the board!
Then the resistors are next. These are mounted upright. This means that one leg is bent
back/down. Then the legs are plugged through the holes. The resistance comes in the circle.
R1, R2, R3 : 100kΩ (Brown, Black, Yellow, Gold)
R4, R5
: 10kΩ (Brown, Black, Orange, Gold)
R6
: 1kΩ (Brown, Black, Red, Gold)
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JOTA-JOTI 2011 KIT
Now find the capacitors:
C1: Ceramic capacitor 1nF (102K) (Carefully bend the wires out)
C2: Elco, 10 uF (long lead wire is the +)
C3: Elco, 47 uF (long lead wire is the +)
Transistors: 3 x BC547C (note the flat sides!)
Battery terminals (note that the open sides facing each other!)
Insert the battery (AAA 1.5V) in the terminals and plug your headphones. The signal finder is
now ready for use! Press the switch to activate the signal finder. Listen to the sounds of a cell
phone, TV, or ..... Enjoy!
S1b
Antenne
S1a
R4
R5
R6
10k
10k
1k
BT1
Battery
J1a G N D
C3
D2
C1
Q2
BC547C
R1
100k
GND
GND
GND
R2
R3
C2
100k
GND
Q3
BC547C
1n
1N5711
D1
1N5711
47uF
Q1
BC547C
10uF
GND
GND
100k
J1b