Introduction Function generator is one of the most important instruments of an electronics laboratory. It is used for repairing and designing electronic circuits. It is used for testing electronic devices as well. Purchasing a new function generator from the market is not a big problem but not every electronics learner and hobbyist can purchase a new function generator like me due to their high costs. So for electronics learner's and hobbyist cheap function generators are available as DIY kits. XR2206 Function Generator kit is one of them. Although It is not as effective as a commercial one but it can be used to fulfil all the requirements of an electronics learner and hobbyist. Also the XR2206 function generator kit has very less features in comparison to a function generator that is used in electronics laboratories.
Features of XR2206 Function Generator Kit
Low Cost (about 7$).
Available in both pre soldered and solderable form.
Small size and weight.
Transparent case for for protecting the kit.
Frequency Adjustable.
Amplitude Adjustable.
Cable of generating sine, square and triangle wave signals.
Operates on 9V DC power supply.
Instruction manual is included in the kit.
All the components are THT(soldiering process is easy).
Easy to operate.
List of Components (Included in the kit)
Resistors
R1------->1k
R2------->50k
R3------->5.1k
R4------->330
R5------->5.1k
R6------->5.1k
R7------->50k
R8------->100k
Capacitors
C1------->100uF
C2------->0.1uF(104)
C3------->10uF
C4------->10uF
C5------->1uF(105)
C6------->0.047uF(473)
C7------->0.002(222)
C8------->100pF(101)
Integrated Circuit(IC)
U1------->XR2006(DIP-16 package)
DC power jack Male headers
J3------->2x5
J2------->2x2
PCB Terminal(3 Pin) Jumpers PCB Transparent Acrylic Case M3 Nut & Bolts Potentiometer knob Necessary Tools for Assembling the kit For assembling this function generator kit following tools are compulsory.
Soldering Iron (60W)
Soldering Wire (0.8mm)
Soldering Flux
Screw Driver
Wire Cutter
Acetone ( For cleaning the PCB after soldering)
Brush
XR2206 kit PCB (Printed Circuit Board)
For Assembling the kit go through the following steps
Step-1: [Soldering Resistor] This is the first step of whole soldering process. In this step we solder all the resistors included in the DIY kit on PCB. Before soldering the resistors we find their values. For finding the resistors values we can take the help of following resistors colour code chart: After finding the values of all the resistors we can easily identify which are R1, R2, R3,.............R8. Mount all the resistor on the PCB as shown below: Resistors do not have polarity so we can solder them without caring about their polarity. Bend the leads of all resistors so that they can not leave their places before being soldered. Now make solder joints and cut out the excess leads of the resistors with the help of a wire cutter. Step-2: [Soldering Ceramic Capacitors] In this step we have to solder all the ceramic capacitors. Like resistors ceramic capacitors do not have polarity also, so we can easily solder them on the PCB easily. Make solder joints and cut out the excess leads of the ceramic capacitors.
Step-3:[Soldering Electrolytic Capacitors] In this step we solder the electrolytic capacitors. The Electrolytic capacitors have polarity so before mounting them on the PCB we need to find their positive and negative leads. Generally The longer lead of the electrolytic capacitor is +Ve and shorter lead is -Ve. After finding the polarity of electrolytic capacitors mount them on the PCB as shown below: After mounting all three electrolytic capacitors bend their leads and make solder joints. After making the solder joints cut out their excess leads:
Step-4:[Soldering 2x5 & 2x2 Male headers] In this step we solder 2x5 & 2x2 male headers. For this mount both of them on the PCB as shown in the given fig. make the solder joints. Unlike resistors and capacitor male headers do not have excess leads so here we do not need to cut excess leads.
Step-5:[Soldering DC Jack] In this step we solder the DC power jack. Mount the jack on the PCB as shown in the following Fig.
Now make solder joints. During soldering DJ jack please increase the temperature of soldering iron otherwise solder joint would not be clean.
Step-6:[Soldering IC holder] In this step we solder the IC holder. Before mounting the IC holder on PCB please keep the cut mark (Notch) of IC holder at top side and flat side towards bottom side. Step-7:[Soldering Potentiometers] Before soldering the potentiometers we need to Identify their vales. The left and right potentiometers are of 50k and middle one is of 100k. After finding the vales of potentiometer mound them on the PCB and make solder joints
Step8:[Soldering PCB Terminal] In this step we solder the 3-pin PCB terminal. This is the last component left for soldering. Mount the PCB terminal on the PCB as shown in the following fig. After mounting the PCB terminal make solder joints.
Step-9:[Cleaning the PCB with Acetone] In this step we clean the PCB board with acetone and plastic brush. It is necessary because during soldering, soldering flux makes the PCB board dirty. After cleaning with acetone it looks as clean as new PCB.
Step-10:[Preparing the Acrylic Case] A transparent acrylic case is also provided in the kit to keep the PCB save. M3 nut & bolts is also included in the kit for fixing the PCB on the bottom acrylic sheet. Remove the protecting layers of acrylic case insert M3 nuts as shown in the Fig. Mount the Function generator PCB on the kit with the help of nuts & bolts. Use screw driver to tight the nuts. set the potentiometers to initial position and fix the potentiometers knobs as shown in the Fig.
also attach all four side layers as shown. Now put the top acrylic sheet and tight it with screws and screw drivers. Now our KR2206 function generator kit is ready to use and it looks really nice.
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