User Manual. Learn Soldering. From. Technology Uncorked.

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1 Learn Soldering Kit has been designed to help you learn the art of soldering, so that you can assemble interesting circuits and spend hours experimenting and innovating with electronics. This kit has three very interesting applications integrated on it. User Manual Learn Soldering From Technology Uncorked TU Technology Uncorked LLP. All Rights Reserved. P a g e 1

2 Learn Soldering For any questions, concerns, or issues; submit them to TU Technology Uncorked LLP provides the enclosed product(s) for use in Engineering development, demonstration, and education or evaluation. The kit contains tools which work off 220V AC and can be safety hazard if not used properly. Kindly make sure that all instructions provided in the document are being adhered to. The parts of the kit should be kept out of reach of small children and are recommended to be used under adult supervision. Mailing address: Technology Uncorked LLP, D-125, Sushant Lok-3, Sector 57, Gurgaon, Haryana, India TU Technology Uncorked LLP. All Rights Reserved. P a g e 2

3 Content Learn Soldering... 5 Overview... 5 In the Box... 5 Learn Soldering PCB... 5 Component Bag... 5 Soldering Tools and Accessories... 5 Learning to Solder... 7 Getting Ready... 7 How to Solder... 8 Basic Tips for Mounting Components... 8 Soldering Getting familiar with Applications on Learn Soldering Kit Darkness Detector: Flashing LED Circuit: Water Level Indicator Circuit: Preliminary checks for Soldering Quality Testing the Applications TU Technology Uncorked LLP. All Rights Reserved. P a g e 3

4 List of figures Figure 1: 3 in 1 Learn Soldering PCB... 5 Figure 2: Soldering Iron and Stand... 7 Figure 3: Solder Wire... 7 Figure 4: Sponge... 8 Figure 5: IPA and Cotton... 8 Figure 6: Soldering Mask... 8 Figure 7: Mounting and Solder Side... 9 Figure 8: How to mount Components on Learn Soldering PCB Figure 9: How to bend leads of a Resistor Figure 10: Example of Polar and Non - Polar Components Figure 11: Pads on Learn Soldering PCB Board Figure 12: Transistor Figure 13: 555 Timer IC Figure 14: How to solder a Through - Hole Component Figure 15: How to solder a SMD Component Figure 16: Mounting Side after Mounting All the Components Figure 17: Solder Side after Soldering All the Components Figure 18: How to connect Battery Figure 19: Water Level Indicator Circuit Setup List of Tables Table 1: Soldering Tools & Accessories... 6 Table 2: Component Bag... 9 Table 3: Correlating Resistor Values through Color Code TU Technology Uncorked LLP. All Rights Reserved. P a g e 4

5 Learn Soldering Overview Learn Soldering Kit has been designed to help you learn the art of soldering, so that you can assemble interesting circuits and spend hours experimenting and innovating with electronics. This kit has three very interesting applications integrated on it. The Darkness detector which detects darkness and gives you darkness indication. The Flashing LED, which creates an interesting application of a blinking LED. Water Level Indicator which sounds a buzzer when the water reaches a specific level. Use the YouTube video to mount and solder various components. YouTube Video: So, go ahead and Learn as You Build and Test each of these Applications. In the Box The Learn Soldering Kit comprises of following items: Learn Soldering PCB Figure 1: 3 in 1 Learn Soldering PCB The Learn Soldering PCB gives you a chance to build three electronic applications and have lot of fun and learning while experimenting with them. Component Bag Component bag contains 25 Surface Mount and Through Hole components which need to be mounted on the PCB and soldered to realize the three applications integrated on Learn Soldering PCB. Soldering Tools and Accessories You would find following tools and Accessories in the Learn Soldering box: TU Technology Uncorked LLP. All Rights Reserved. P a g e 5

6 Table 1: Soldering Tools & Accessories Part Name Quantity Image Soldering Iron/25watt 1 Soldering Stand 1 Soldering wire/50 gram 1 Sponge 1 Soldering Mask 1 Flux/15gram 1 IPA in bottle 1 TU Technology Uncorked LLP. All Rights Reserved. P a g e 6

7 Tweezers 1 Cotton Wool Learning to Solder Getting Ready Lay out the soldering iron and its stand on your worktable. Soldering Iron is used for heating and melting solder (solder is used to make the joints between the electronic components and tracks on the PCB). Soldering stand allows you to place soldering iron so that things in the surrounding do not get damaged by the hot soldering iron. Figure 2: Soldering Iron and Stand Set the Solder Wire near the Iron. Figure 3: Solder Wire Wet the sponge, and place it on the base of your soldering iron stand. TU Technology Uncorked LLP. All Rights Reserved. P a g e 7

8 Figure 4: Sponge Set IPA and cotton wool well within your reach as they would be used to clean up the PCB. Figure 5: IPA and Cotton Flux shall be used to facilitate the soldering process and prevent the formation of oxide impurities on the soldering joint. When we do soldering, the flux in the solder releases fumes as it is heated. These fumes can cause irritation to our eyes and lungs. Therefore avoid breathing the fumes. Use the mask during soldering. Mask Figure 6: Soldering Mask How to Solder Plug in the soldering iron into AC power socket and put it on for heating, while resting in the stand. Before using a new soldering tip or one that is dirty, it must be cleaned and tinned. Tinning is the process of coating a soldering tip with a thin coat of solder. This aids in heat transfer between the tip and the component you are soldering. Once the iron is sufficiently hot, clean and tins it. Mount components one at a time, solder them and then move to the next component. Basic Tips for Mounting Components Now you are ready to start mounting and soldering the components on the Learn Soldering PCB. TU Technology Uncorked LLP. All Rights Reserved. P a g e 8

9 Open the Component Bag and get familiar with the various components and the locations where they need to be mounted on the Learn Soldering PCB. Table 2: Component Bag Make sure that the components are mounted on the Component side and soldered on the Solder Side of the board. Figure 7: Mounting and Solder Side TU Technology Uncorked LLP. All Rights Reserved. P a g e 9

10 Choose the component to be soldered taking reference from the figure shown below J1 9V Battery connector. Solder black wire of 9V battery connector cable to ground Pad and Red wire to other terminal of J1 R6, R3- SMD 10KΩ Resistor R5, R2 10KΩ Resistor C3, C1-100µf Capacitor. Shorter leg to be connected to ground pad (see solder side of the board). SU1 Buzzer D4 Power LED, glows when battery connected to J1. D1, D3 Output LEDs.Longer leg of LED to be connected to circular pad (see solder side of the board). 2 Pin PBT connector R1, R8 560Ω Resistor Longer leg to be connected to circular pad (see solder side of the board). COMPONENT MOUNTING SIDE R4 470KΩ Resistor Q1 BC547 Transistor E (emitter) pin to be connected to ground pad (see solder side of the board). R7 470Ω Resistor C2, C4 10nf Capacitor U1, U2- NE555 Timer IC First Pin to be connected to square pad (see solder side of the board). Figure 8: How to mount Components on Learn Soldering PCB For mounting a resistor, choose appropriate resistor by referencing the color codes below TU Technology Uncorked LLP. All Rights Reserved. P a g e 10

11 Table 3: Correlating Resistor Values through Color Code S. No. Mounting Location 1 R1, R8 Value 560Ω Component Image 2 R2, R5 10kΩ 3 R3, R6 SMD - 10kΩ 4 R4 470KΩ 5 R7 470Ω To understand about the color coding standards of Resistors read the Knowledge Bank article at the following link: https://www.tu-eshop.com/index.php?route=information/news&news_id=11 If the component is a resistor, then bend its leads and insert in the holes provided for it on the board. Through hole components like ICs and capacitors do not require the leads to be bent before inserting them into the holes. So work accordingly. Figure 9: How to bend leads of a Resistor TU Technology Uncorked LLP. All Rights Reserved. P a g e 11

12 Some of the components are polar like LEDs, buzzer and have leads of different length. Positive side lead have longer length and negative side have shorter length, also their footprint on PCB indicate positive side lead either by square pad or by other marking, so carefully insert them into correct holes. For other components which are non- polar, you can place them in any way as they have all leads of equal length. This needs to be done very carefully, as reversing the polarity may damage the circuit, when connected to power. In case the component accidentally got mounted with reverse polarity then gently de-solder it by heating the solder and gently pulling out the component. Shorter lead Longer lead Non Polar Capacitor Polar LED Figure 10: Example of Polar and Non - Polar Components For mounting Polar components you have to take care of pads as explained above. Different type of pads on PCB are shown below: Square Pad Circular Pad Ground Pad directly shorted to ground plane shown in red color and no track is connected to it. Figure 11: Pads on Learn Soldering PCB Board TU Technology Uncorked LLP. All Rights Reserved. P a g e 12

13 Now next we have components that have specific pin configuration like transistor. A transistor has 3 pins: emitter, base and collector; so care should be taken while inserting them into holes so that each pin is placed at its appropriate position according to your design. Confirm pin configuration from datasheet of that component. E: Emitter B: Base C: Collector Figure 12: Transistor Now next we have some components whose pin 1 is indicated by dot on their surface like ICs. Moreover, pin 1 is identified on their footprint on PCB board by having square pad for it, so mount them in such a way that first pin is placed on square pad side. Example of such component is NE555 Timer IC. First Pin correspond to square pad Figure 13: 555 Timer IC Take the help from figure 3 to see how to mount all these components. Soldering To solder a component mounted on the board melt a small blob of solder on the tip of soldering iron. Carefully place the tip onto the interface of the lead and pad. The tip must touch both the lead and the pad. Figure 14: How to solder a Through - Hole Component TU Technology Uncorked LLP. All Rights Reserved. P a g e 13

14 The solder should runaround by itself and fill in and create a joint. Stop feeding the solder when the correct amount of solder has been added to the joint. To solder surface mounted (SMD) components first put some solder on one of the pads of SMD component on the PCB. Now pick the SMD component with the help of a tweezer and carefully place it on its footprint. Now first solder the pin which corresponds to the pad on which solder was already applied. By doing so the SMD component is fixed to the board. Now solder the other pin. Figure below demonstrates this process. Figure 15: How to solder a SMD Component After the soldering is completed, give a final finish by putting some flux on all the soldered pads and heating them up with soldering iron to make sure that all the pads are properly soldered. Now clean up the soldered side of the PCB. For this purpose use IPA and cotton wool. Wet the cotton wool with IPA and clean the area. Following pictures depict the way the Learn Soldering PCB would look once you are finished with the task. Figure 16: Mounting Side after Mounting All the Components TU Technology Uncorked LLP. All Rights Reserved. P a g e 14

15 Figure 17: Solder Side after Soldering All the Components Getting familiar with Applications on Learn Soldering Kit Darkness Detector: When light is present, the LDR has low resistance. Due to that voltage at the base of the transistor is not high enough to turn it on. Therefore, no current will flow from the collector to the emitter of the transistor. All the current will instead pass through the resistor R4 (470KΩ) and the LDR. When it is dark, the LDR has high resistance. This means that there will be a voltage drop over the LDR. LDR is connected from the base to the emitter of the transistor Q1. This means that we will also have a voltage drop from the base to the emitter. This is what is needed to turn the transistor on. So since the transistor is turned on, current will pass through 600Ω resistor R1, the LED D1 and from collector to the emitter of the transistor. This will make the LED D1 turn on. Flashing LED Circuit: In this circuit, the 555 timer is configured into Astable mode operation in which a square wave i.e. alternate high and low value is consistently generated from the output pin 3 of the 555 Timer IC. When the output is high, LED D3 will glow on and when output is low, LED turns off. Water Level Indicator Circuit: This circuit is also based on an Astable mode of 555 timer. The operating frequency of the astable multivibrator here will depend on capacitor C1, resistances R2, R3 and the resistance across the probes connected to PBT connector. When there is no water up to the probes, they will be open and so the multivibrator will not produce oscillations and the buzzer will not beep. When there is water up to the level of probes, some current will pass through the water, the circuit will be closed to some extent, and the IC will start producing oscillations in a frequency proportional to the value of C1, R2, R3 and the resistance of water across the probes. The buzzer will beep to indicate the presence of water up to the level of the sensing probes. TU Technology Uncorked LLP. All Rights Reserved. P a g e 15

16 Preliminary checks for Soldering Quality 1. Make sure that 5V and ground i.e. pins of J1 connector are not short. If so then power LED D4 will not glow. You can also use a Multi meter to check the short. In case of a short, carefully go over the circuit and check for shorts. It is also a good practice that you check for 5V and ground shorts after soldering every 2-3 components, if you are a beginner. 2. Make sure that all the polar components are mounted with the right polarity. 3. Make sure that IC is mounted correctly (Pin 1 of IC to be soldered to square pad) 4. Make sure that the transistor is mounted correctly. Emitter pin should be Testing the Applications 1. First of all connect 12V battery to 9V Battery connector already soldered to J1, by doing so power indicator LED D4 will glow up. Figure 18: How to connect Battery 2. LED D3 of flashing LED circuit starts blinking. 3. Now to see the application of Darkness Detector circuit practically. Cover the LDR somehow, for example use black tape or use your hand. By doing so there is darkness for LDR and LED D1 turns on. 4. Do the setup as shown in the diagram below for water level indicator circuit. Connect the probes from PBT connector. Tape the other end of the connectors inside the jug at a specific level. Make TU Technology Uncorked LLP. All Rights Reserved. P a g e 16

17 sure that the metallic end of the probes is not covered by the tape. Now start filling up the water in the jug. When water reaches up to the level of probes, then buzzer starts sounding. Figure 19: Water Level Indicator Circuit Setup TU Technology Uncorked LLP. All Rights Reserved. P a g e 17

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