Summary of Contents for Abra AK-270
- Page 1 HEX3653 FM Radio Receiver Module D.I.Y. Kit (for Advanced Users) Part Number: AK-270...
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Page 2: Table Of Contents
Table of Contents 1. Description ………………………………………………………………………………………………………………. 2. Specification …………………………………………………………..…………………………………………..…… 3. Bill of Materials ………………………………………………….……………………………………….…………… 4. Circuit Diagram …………………………………………………………………………………………………...….. 5. How It Works ………………………………………………………………………………………………………….. 6. Assembly …………………………………………………………………………………………………………..…….. -
Page 3: Description
1. Description: This FM receiver is a D.I.Y. kit that requires soldering through-hole and surface mount components on a double-sided printed circuit board. It is designed for users with advanced soldering tools and skills. You must solder the IC pins on the top surface and the rest of the components’... - Page 4 2) 4x 10kΩ ¼ Watt 7) 2x 1N4148 12) 1x 3.5mm Stereo Resistors – R1, R2, Switching Signal Audio Socket – R3, R4 Diodes – D1, D2 PHONE 8) 1x SS8050 NPN 13) 1x Single-row 4-pin Transistor – Q1 Header with 3) 2x 100µF 50V jumper –...
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Page 5: Circuit Diagram
4. Circuit Diagram: The following figure represents how the HEX3653 FM Receiver circuit is constructed:... -
Page 6: How It Works
5. How It Works: The kit that you’ve purchased is essentially a stereo auto-scanning FM receiver based on a single HEX3653 chip that uses push buttons to adjust the volume, scan FM channels and power ON/OFF. It requires two AA 1.5V batteries to power up; therefore, the operating voltage is around 3V in case an external power supply is used. - Page 7 From the second pin of the ASW header, the alternating current passes through the 10µH inductor (L1) and the 33pF capacitor (C4) as well as the 1N4148 diodes (D1 & D2) in order to limit the pin voltage to about 0.3V to protect the chip from damage. This signal enters the HEX3653 chip at pin 4 (FM IN).
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Page 8: Assembly
The DC bias of the left and right signal (Lout & Rout) is fed to the Q1 transistor to turn the LED on when the FM receiver is in use. The left and right signals (Lout & Rout) are terminated at the 3.5mm audio socket where you can plug in your small speakers or a headphone. - Page 9 *ATTENTION* DO NOT USE RUBBING ALCOHOL, IT WILL DAMAGE THE COMPONENTS. 2) Open the package and verify the components. (refer to section 3. Bill of Materials on page 3-4 for this step) 3) Lay down the IC, resistors and capacitors, push buttons, audio socket and other components in a safe spot on your workbench and proceed to the next step.
- Page 10 The soldering iron temperature depends on the type of solder used. If you are using a typical 60/40 lead solder, the temperature should be set depending on the thickness anywhere between 370 to 500 °F (187 to 260 °C). you are using a lead-free solder, increase above temperatures by 40 to 70 °F (5 to 20 °C).
- Page 11 Refer to the guide below as a reference to inspect the quality of your soldered joints. 7) Once the HEX3653 chip is soldered on the PCB, place the resistors (R1, R2, R3 & R4), the ceramic capacitors (C3, C4 & C5), the inductor (L1) and the diodes (D1 & D2) on the board and solder them from the bottom side.
- Page 12 10) Next, insert the push buttons (PWR, Vol-, VOL+, SEEK- & SEEK+) onto the board and solder them from the bottom side. 11) Insert the 3.5mm audio socket (PHONE) onto the board and solder the pins that are inserted in the square-shaped pads. There are five of them. 12) Finally, place the single-row 4-pin header (ASW) on the board and solder it from the bottom side.
- Page 13 17) Place the header jumper between pin 2 and 3 on ASW. Plug in your headphone/earphones and turn ON the FM receiver by pressing the PSW push button once. 18) You have completed the assembly of your module. For more Educational D.I.Y. Kits visit https://abra-electronics.com/educational-kits-trainers/...
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Как подключить к смартфону звуковой усилитель ак270