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        • C
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      • PIC32
        • C
          • NECTO Studio
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        • Basic
          • mikroBasic PRO for PIC32
        • Pascal
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        • Additional Software
          • CODEGRIP WiFi license
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          • Visual TFT
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          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • ARM
        • C
          • NECTO Studio
          • mikroC PRO for ARM
        • Basic
          • mikroBasic PRO for ARM
        • Pascal
          • mikroPascal PRO for ARM
        • Additional Software
          • CODEGRIP WiFi license
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          • Visual TFT
          • Visual TFT AI
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • AVR
        • C
          • NECTO Studio
          • mikroC PRO for AVR
        • Basic
          • mikroBasic PRO for AVR
        • Pascal
          • mikroPascal PRO for AVR
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • FT90x
        • C
          • mikroC PRO for FT90x
        • Basic
          • mikroBasic PRO for FT90x
        • Pascal
          • mikroPascal PRO for FT90x
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • 8051
        • C
          • mikroC PRO for 8051
        • Basic
          • mikroBasic PRO for 8051
        • Pascal
          • mikroPascal PRO for 8051
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
    • Dev Boards
      • PIC (8-bit)
        • 8th Generation
          • Fusion for PIC v8
          • EasyPIC PRO v8
          • EasyPIC PRO v8 over USB-C
          • EasyPIC v8
          • EasyPIC v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC PRO v7a
          • PICPLC16 v7a
          • EasyPIC v7a
          • EasyPIC PRO v7
          • EasyPIC v7
        • 6th Generation
          • PICPLC16 v6
      • dsPIC/PIC24 (16-bit)
        • 8th Generation
          • EasyPIC v8 PIC24/dsPIC33
          • EasyPIC v8 for dsPIC30
          • EasyPIC v8 for dsPIC30 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
          • EasyPIC v7 for dsPIC30
        • 6th Generation
          • Easy24-33 v6
      • PIC32 (32-bit)
        • 8th Generation
          • Fusion for PIC32
          • Fusion for PIC32 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
      • ARM (32-bit)
        • 8th Generation
          • Fusion for ARM v8
          • Fusion for ARM v8 over USB-C
          • Fusion for STM32 v8
          • Fusion for STM32 over USB-C
          • Fusion for KINETIS v8
          • Fusion for Kinetis v8 over USB-C
          • Fusion for TIVA v8
          • Fusion for TIVA v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyMx PRO v7a STM32
          • EasyMx PRO v7 STM32
          • EasyMx PRO v7 Tiva
      • AVR (8-bit)
        • 8th Generation
          • EasyAVR v8
          • EasyAVR PRO v8
          • EasyAVR PRO v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyAVR v7
        • 6th Generation
          • AVRPLC16 v6
      • 8051 (8-bit)
        • 7th generation
          • BIG8051
        • 6th Generation
          • Easy8051 v6
      • PSoC (8-bit)
        • 6th Generation
          • UNI-DS6 Development System
      • RISC-V (32bit)
        • 8th Generation
          • UNI-DS v8
          • UNI-DS v8 over USB-C
      • Universal Boards
        • 8th Generation
          • UNI-DS v8
          • UNI-DS v8 over USB-C
          • Fusion for PIC v8
          • Fusion for ARM v8
        • 7th Generation
          • EasyPIC Fusion v7
        • 6th Generation
          • UNI-DS6
          • mikroBoard for PIC 80-pin
          • mikroBoard for AVR
          • mikroBoard for dsPIC
          • mikroBoard for PSoC
          • mikroBoard for 8051
          • mikroBoard for PIC 40-pin
          • mikroBoard for ARM
          • mikroBoard for ARM 144-pin
      • IoT - Wearable
        • Hexiwear
          • Hexiwear
          • Hexiwear Power User Pack
          • Hexiwear Docking Station
          • Hexiwear Battery Pack
          • Hexiwear Color Pack
          • Hexiwear Workstation
      • Analog Boards
        • 7th Generation
          • Analog System Lab Kit PRO
    • Starter Boards
      • PIC (8-bit)
        • Clicker
          • PIC clicker
        • Clicker 2
          • Clicker 2 for PIC18FJ
          • Clicker 2 for PIC18FK
        • Clicker 4
          • Clicker 4 for PIC18F
          • UNI Clicker
        • Ready
          • Ready for PIC Board
          • Ready for PIC (DIP28)
          • PIC-Ready2 Board
          • MMC Ready Board
        • StartUSB
          • StartUSB for PIC
      • dsPIC/PIC24 (16-bit)
        • Clicker 2
          • Clicker 2 for PIC24
          • Clicker 2 for dsPIC33
        • Clicker 4
          • UNI Clicker
        • Ready
          • dsPIC-Ready1 Board
          • dsPIC-Ready2 Board
          • DsPIC-Ready3 Board
          • dsPIC-Ready4 Board
      • PIC32 (32-bit)
        • Clicker
          • PIC32MX clicker
          • 6LoWPAN Clicker
          • PIC32MZ clicker
        • Clicker 2
          • Clicker 2 for PIC32MX
          • Clicker 2 for PIC32MZ
        • Clicker 4
          • UNI Clicker
        • MINI
          • MINI-32 Board
          • MINI-32 for PIC32MZ
        • Flip&Click
          • Flip&Click PIC32MZ
      • ARM (32-bit)
        • Clicker
          • RA4M1 Clicker
          • Kinetis Clicker
          • MSP432 Clicker
          • CEC1702 clicker
          • CEC1302 Clicker
          • STM32 M4 clicker
        • Clicker 2
          • Clicker 2 for STM32
          • Clicker 2 for Kinetis
          • Clicker 2 for CEC1702
          • Clicker 2 for MSP432
          • Clicker 2 for CEC1302
          • Clicker 2 for PSoC 6
        • Clicker 4
          • Clicker 4 for STM32F745VG
          • Clicker 4 for STM32F4
          • Clicker 4 for TMPM3H
          • Clicker 4 for TMPM4K
          • Clicker 4 for STM32
          • UNI Clicker
        • MINI
          • MINI-M4 for STM32
          • MINI-M4 For Kinetis
          • MINI-M4 for Tiva
          • MINI-M4 for Stellaris
          • MINI-M4 for MSP432
          • MINI-M0 for STM32
        • Flip&Click
          • Flip&Click SAM3X
      • AVR (8-bit)
        • Clicker 4
          • UNI Clicker
        • MINI
          • MINI-AT Board - 3.3V
          • MINI-AT Board - 5V
        • Ready
          • Ready for AVR Board
          • Ready For XMEGA
          • mikroXMEGA Board
          • AVR-Ready2 Board
        • StartUSB
          • StartUSB for AVR
      • 8051 (8-bit)
        • Ready
          • 8051-Ready Board
      • FT90x (32-bit)
        • Clicker 2
          • Clicker 2 for FT90x
      • Miscellaneous
        • USB
          • USB Wizard
          • Quail
          • FlowPaw Kit
      • Universal Boards
        • Clicker 4
          • UNI Clicker
    • Prog-Debug
      • PIC (8-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
          • CODEGRIP for PIC
          • CODEGRIP for PIC USB-C
        • mikroProg
          • mikroProg for PIC
      • dsPIC/PIC24 (16-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
          • CODEGRIP for PIC
        • mikroProg
          • mikroProg for dsPIC
      • PIC32 (32-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
          • CODEGRIP for PIC
          • CODEGRIP for PIC USB-C
        • mikroProg
          • mikroProg for PIC32
      • ARM (32-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP USB-C
          • CODEGRIP for ARM
          • CODEGRIP for ARM USB-C
          • CODEGRIP for STM32
          • CODEGRIP for KINETIS
          • CODEGRIP for Tiva
          • CODEGRIP for Tiva USB-C
        • mikroProg
          • mikroProg for STM32
          • mikroProg for Tiva
          • mikroProg for Kinetis
          • mikroProg for CEC
          • mikroProg for MSP432
          • mikroProg for PSoC 5LP
      • AVR (8-bit)
        • CODEGRIP
          • CODEGRIP for AVR
          • CODEGRIP for AVR - USB-C
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
        • mikroProg
          • mikroProg for AVR
      • 8051 (8-bit)
        • mikroProg
          • mikroProg for 8051
      • FT90x (32-bit)
        • mikroProg
          • mikroProg for FT90x
    • Smart Displays
      • 2.8"
        • ARM (32-bit)
        • AVR (8-bit)
        • dsPIC/PIC24 (16-bit)
        • PIC (8-bit)
        • PIC32 (32-bit)
      • 3.5"
        • ARM (32-bit)
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        • PIC (8-bit)
        • PIC32 (32-bit)
      • 4.3"
        • ARM (32-bit)
        • FT90x (32-bit)
        • PIC (8-bit)
        • PIC32 (32-bit)
      • 5"
        • ARM (32-bit)
        • FT90x (32-bit)
        • PIC32 (32-bit)
      • 7"
        • ARM (32-bit)
        • FT90x (32-bit)
    • MCU Cards
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        • 8th Generation
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      • PIC32 (32-bit)
        • 8th Generation
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      • ARM (32-bit)
        • 8th Generation
        • 7th Generation
      • AVR (8-bit)
        • 8th Generation
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        • 8th Generation
    • Accessories
      • TFT Displays
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MikroElektronika white logo
  • Products
    • click boards icon Click Boards
      • Wireless Connectivity
        • GPS/GNSS
        • GSM/LTE
        • LTE IoT
        • BT/BLE
        • WiFi
        • RFID/NFC
        • GSM+GPS
        • 6LoWPAN
        • ZigBee
        • UWB
        • SigFox
        • Sub-1 GHz Transceievers
        • 2.4 GHz Trancevers
        • LoRa
        • WiFi+BLE
      • Sensors
        • Biometrics
        • Gas
        • Magnetic
        • Motion
        • Optical
        • Pressure
        • Proximity
        • Temperature & humidity
        • Current sensor
        • Miscellaneous
        • Environmental
        • Force
        • Inductance
        • RF meter
        • Click Shields
        • Click Bundles
      • Interface
        • Adapter
        • CAN
        • Port expander
        • RS485
        • USB
        • 1-Wire
        • RS232
        • Ethernet
        • LIN
        • PWM
        • Current
        • DALI
        • I2C
        • Fiber optics
        • SPI
        • DMX
        • CXPI
        • Click Shields
        • Click Bundles
      • Display & LED
        • LED Drivers
        • LED Matrix
        • LED Segment
        • OLED
        • LCD
        • TFT
        • Click Shields
        • Click Bundles
      • Miscellaneous
        • Relay
        • Optocoupler
        • ID
        • Proto
        • Encryption
        • Click Shields
        • Click Bundles
      • Mixed Signal
        • ADC
        • Measurements
        • DAC
        • Digital potentiometer
        • ADC-DAC
        • Click Shields
        • Click Bundles
      • Storage
        • EEPROM
        • FLASH
        • FRAM
        • microSD
        • MRAM
        • SRAM
        • EERAM
        • ReRAM
        • DRAM
        • Click Shields
        • Click Bundles
      • Motor Control
        • Brushed
        • Brushless
        • Servo
        • Stepper
        • Click Shields
        • Click Bundles
      • Audio & Voice
        • Amplifier
        • Microphone
        • Speakers
        • Signal Processing
        • Speech recognition
        • FM
        • MP3
        • Click Shields
        • Click Bundles
      • HMI
        • Capacitive
        • Pushbutton/Switches
        • Potentiometers
        • Rotary encoder
        • Haptic
        • Fingerprint
        • Click Shields
        • Click Bundles
      • Clock & Timing
        • RTC
        • Clock generator
        • Click Shields
        • Click Bundles
      • Power Management
        • Battery charger
        • Boost
        • Buck
        • Linear
        • Buck-Boost
        • Wireless Charging
        • Power Switch
        • USB-C PD
        • Click Shields
        • Click Bundles
      • Click Bundles
      • Click Shields
    • necto icon NECTO
      • NECTO Studio
    • compilers icon Compilers
      • PIC
        • C
          • NECTO Studio
          • mikroC PRO for PIC
        • Basic
          • mikroBasic PRO for PIC
        • Pascal
          • mikroPascal PRO for PIC
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual TFT AI
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • dsPIC/PIC24
        • C
          • NECTO Studio
          • mikroC PRO for dsPIC
        • Basic
          • mikroBasic PRO for dsPIC
        • Pascal
          • mikroPascal PRO for dsPIC
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • PIC32
        • C
          • NECTO Studio
          • mikroC PRO for PIC32
        • Basic
          • mikroBasic PRO for PIC32
        • Pascal
          • mikroPascal PRO for PIC32
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • ARM
        • C
          • NECTO Studio
          • mikroC PRO for ARM
        • Basic
          • mikroBasic PRO for ARM
        • Pascal
          • mikroPascal PRO for ARM
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual TFT AI
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • AVR
        • C
          • NECTO Studio
          • mikroC PRO for AVR
        • Basic
          • mikroBasic PRO for AVR
        • Pascal
          • mikroPascal PRO for AVR
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • FT90x
        • C
          • mikroC PRO for FT90x
        • Basic
          • mikroBasic PRO for FT90x
        • Pascal
          • mikroPascal PRO for FT90x
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • 8051
        • C
          • mikroC PRO for 8051
        • Basic
          • mikroBasic PRO for 8051
        • Pascal
          • mikroPascal PRO for 8051
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
    • dev boards icon Dev Boards
      • PIC (8-bit)
        • 8th Generation
          • Fusion for PIC v8
          • EasyPIC PRO v8
          • EasyPIC PRO v8 over USB-C
          • EasyPIC v8
          • EasyPIC v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC PRO v7a
          • PICPLC16 v7a
          • EasyPIC v7a
          • EasyPIC PRO v7
          • EasyPIC v7
        • 6th Generation
          • PICPLC16 v6
      • dsPIC/PIC24 (16-bit)
        • 8th Generation
          • EasyPIC v8 PIC24/dsPIC33
          • EasyPIC v8 for dsPIC30
          • EasyPIC v8 for dsPIC30 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
          • EasyPIC v7 for dsPIC30
        • 6th Generation
          • Easy24-33 v6
      • PIC32 (32-bit)
        • 8th Generation
          • Fusion for PIC32
          • Fusion for PIC32 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
      • ARM (32-bit)
        • 8th Generation
          • Fusion for ARM v8
          • Fusion for ARM v8 over USB-C
          • Fusion for STM32 v8
          • Fusion for STM32 over USB-C
          • Fusion for KINETIS v8
          • Fusion for Kinetis v8 over USB-C
          • Fusion for TIVA v8
          • Fusion for TIVA v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyMx PRO v7a STM32
          • EasyMx PRO v7 STM32
          • EasyMx PRO v7 Tiva
      • AVR (8-bit)
        • 8th Generation
          • EasyAVR v8
          • EasyAVR PRO v8
          • EasyAVR PRO v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyAVR v7
        • 6th Generation
          • AVRPLC16 v6
      • 8051 (8-bit)
        • 7th generation
          • BIG8051
        • 6th Generation
          • Easy8051 v6
      • PSoC (8-bit)
        • 6th Generation
          • UNI-DS6 Development System
      • RISC-V (32bit)
        • 8th Generation
          • UNI-DS v8
          • UNI-DS v8 over USB-C
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  1. Home
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  3. Radio Receivers, from crystal set to stereo
  4. mini-fm-receiver
MikroElektronika books

4.2.2.1 Mini FM Receiver

radio-receivers-chapter-04-52a The electronic diagram of the monophonic FM receiver made with TDA7088T is shown on Pic.4.12. If built with SMD components it can be placed in a matchbox, altogether with two button-type batteries. The operating principle of this device is given in the previous chapter. The only thing new is a very simple audio amplifier made with BC547 transistor, which is loaded by cheap 16-Ohm headphones. The telescopic antenna is used, as on Pic.4.8. Small mishap of this receiver is that it has no indication of station tuning. This problem can be solved by adding a small voltmeter in parallel to the BB909, whose scale is graduated in MHz, as described in the Appendix. This solution is not appropriate for the miniature receiver, since the voltmeter that has the scale that is big enough takes too much space. It is in this case better using a manual tuning instead of automatic. Such solution is given on Pic.4.13. The tuning is done via the variable capacitor C with numbers written on its button, similar to that on Pic.3.11. It is most simple to use numbers from 1 to 10. The variable capacitor is like the one on Pic.4.8. Some experimenting is to be done with capacitances of Cx and Cy, in order to cover the entire reception bandwidth, from 88 till 108 MHz. radio-receivers-chapter-04-52b radio-receivers-chapter-04-53a The AFC (Automatic Frequency Control) of the local oscillator is accomplished with BA483 diode, obtaining that station’s position on scale does not “walk” over the scale. The complete radio receiver should still have a loudspeaker. Electronic diagram of such receiver made with TDA7088T is given on Pic.4.14. As one can see, that is a receiver from Pic.4.12 with an audio receiver made with LM386 IC. Maximum value of the DC supply voltage for the TDA7088T is 5V, therefore if using a 4.5 V battery the LM386 will work with reduced output power, the D2 diode and C15 capacitor should be omitted, and R4 should be short-circuited. radio-receivers-chapter-04-53b radio-receivers-chapter-04-54a If higher voltage battery is used, the voltage stabilizer, comprised by the aforementioned components, has to be activated. D2 is a Zener diode with 3 V Zener voltage. The optimum value of R4 is found experimentally: in order to make the power consumption as low as possible it should have the resistance as big as possible, while simultaneously keeping the voltage on Pin 4 about 3 V and the device working well within the entire reception bandwidth (One should start with, say, R4=1.5 kOhm, and if the receiver operates well bigger resistance should be tried out, and if not smaller one, until the optimum value is found). Pic.4.15. shows the PCB for the HF part of the receiver with TDA7088T, that is realized with ordinary components, instead of the SMD’s. Pic.4.15-a shows the board layout from the soldering (copper) side. All the components apart from TDA7088T are mounted on the opposite side of the board, their pins are put through the holes and soldered through the holes. The TDA is soldered on the copper side, directly onto the copper contacts. That is why it is being drawn in dashed line on pic.4.15-b, where the board layout on the component side is given. * Pic.4.16-a shows 3x enlarged picture of the IC and the surrounding lines. The soldering procedure for SMD is as follows: A thin tin layer is applied on the copper contacts where IC legs are to be soldered to. The firs legs to be soldered are the diagonally opposite ones, in this case No.1 and 9. A small cushion-shaped amount of tin (not profuse) is applied on the contacts where these pins are to be soldered (pic.4.17-a). The IC is placed in its position, with all the pins properly laid. Pin No.1 is pressed against the tin pillow with a top of a bodkin, with iron head simultaneously touching both the tin and the pin end. The tin gets melted, and the pin lies down on its place with the aid of the bodkin, and gets soldered. It is now time to check out the positioning of the chip. If it needs to be corrected, the tin surrounding the pin No.1 is melted with iron tip and the chip position is quickly and carefully adjusted, in order not to overheat the pin. Soldering the pin No.9 is shown on Pic.4.17-b. First, the iron tip is simultaneously put on the top of the leg and the copper below it, so that both of them are heated. After app. half a second, the iron is slightly removed from the leg but remains on the copper contact. The tip of the tinol wire is then approached to touch the iron, the pin top and the copper contact at the same time. The wire gets melted and adheres to the copper and the pin, so it has to be constantly moved downwards. When enough tin is applied, the tinol wire is removed first, then the iron, and the pin No.9 is soldered. Once again you have to check whether all the pins are properly placed, and then they too are soldered as it was just described. The solders are OK if they look app. as on Pic.4.17-c. radio-receivers-chapter-04-54b * Pic.4.15-b contains the PCB component side layout. The pushbuttons we used here are Siemens, type BO2AMAP-2. The common housing contains, as one can see, two button switches, one of which is being used by this device. Any other pushbutton switches can also be used. In that case small modifications on the PCB lines would probably be necessary. The board is mounted fairly close to the box edge, so that the switch shafts are passing through the panel, and that the buttons can be mounted on the outside. The panel-mount switches can also be used, in which case they are connected to the board by wires (pic.4.15-e). * Any audio amplifier described so far can be used, e.g. the one with LM386, as on pic.4.8. * Instead of the antenna, a 20 cm piece of wire can also be utilized.

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