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Bill of materials
Dilshan R Jayakody edited this page Aug 24, 2019
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15 revisions
To reduce the dimension of the PCB this unit is designed with combining both through-hole and surface mount components.
All the resistors in this BOM are in 0805 packages with the tolerance of ±5%.
| Designator | Component | Quantity | Notes |
|---|---|---|---|
| C1, C9, C10, C13, C14, C16, C20 | 0.1µF | 7 | SMD - 0805 package |
| C2, C3 | 0.068µF | 2 | SMD - 0805 package |
| C4, C5, C6, C7 | 0.15µF | 4 | SMD - 0805 package |
| C11, C12 | 22pF | 2 | SMD - 0805 package |
| C15 | 0.47µF | 1 | SMD - 0805 package |
| C19 | 0.22µF | 1 | SMD - 0805 package |
| C8 | 1µF / 25V | 1 | Through-hole type 6.3mm polarized capacitor |
| C17 | 220µF / 25V | 1 | Through-hole type 10.0mm polarized capacitor |
| C18 | 470µF / 25V | 1 | Through-hole type 12.5mm polarized capacitor |
| C21 | 10µF / 25V | 1 | Through-hole type 6.3mm polarized capacitor |
| R1, R7, R12, R17 | 1KΩ | 4 | |
| R2, R15, R16, R19, R20, R22 | 10KΩ | 6 | |
| R3, R4, R5, R6 | 1.2KΩ | 4 | |
| R8 | 22KΩ | 1 | |
| R9, R10, R13, R14 | 100KΩ | 4 | |
| R11 | 2.2KΩ | 1 | |
| R18 | 560Ω | 1 | |
| R21 | 4.7KΩ | 1 | |
| RV1 | B20KΩ | 1 | ALPHA RD901F Potentiometer (RD901F-40-15R1-B20K) |
| RV2 | 20KΩ | 1 | ACP CA9 Trim potentiometer |
| FB1, FB2, FB3, FB4, FB5, FB6 | Ferrite bead (Small) | 6 | Panasonic EXCELSV35S or equivalent |
| D4, D5 | SMAJ6.0CA | 2 | |
| D1 | 3mm Green LED | 1 | |
| D2 | 3mm Red LED | 1 | |
| D3 | SS14 | 1 | |
| Y1 | 12.00MHz | 1 | HC49U series crystal |
| J1 | 6.35mm TRS jack socket | 1 | |
| J2, J4, J6 | 3.5mm switched TS jack socket | 3 | |
| J3 | USB Type B connector | 1 | MULTICOMP MC32596 or equivalent |
| J5 | 16-pin single row female header | 1 | |
| J7 | 2 × 4 double row pin header | 1 | |
| J8 | 5.5mm × 2.1mm switched barrel jack socket | 1 | |
| J9 | 2-pin single row pin header | 1 | |
| SW1 | EC11 incremental rotary encoder with switch | 1 | |
| SW2, SW3 | 12mm × 12mm tactile switch | 2 | |
| SW4 | 6mm × 6mm tactile switch | 1 | |
| SK1 | 28-pin 2.54mm IC socket | 1 | |
| LCD1 | HD44780 based 16 × 2 Character LCD with backlight | 1 | https://www.adafruit.com/product/1447 |
This section contains a list of ICs and transistors used in the USB morse keyer unit. Most of the transistors (Q1 - Q4) in this list can replace with substitute components available in the market.
| Designator | Component | Quantity | Description | Product page / Datasheet |
|---|---|---|---|---|
| Q1, Q2, Q3 | S8050 / J3Y | 3 | NPN Silicon epitaxial planar transistor | https://www.alldatasheet.com/datasheet-pdf/pdf/950343/HDSEMI/S8050.html |
| Q4 | BCP56 | 1 | NPN medium power transistor | https://www.onsemi.com/pub/Collateral/BCP56T1-D.PDF |
| U1 | PIC16F886 | 1 | 28-Pin flash-based, 8-bit CMOS microcontroller | http://ww1.microchip.com/downloads/en/DeviceDoc/40001291H.pdf |
| U2 | LM324 | 1 | Single supply quad operational amplifier | https://www.onsemi.com/pub/Collateral/LM324-D.PDF |
| U3 | CH340G | 1 | USB to serial converter | http://www.wch.cn/products/CH340.html |
| U4 | L78M05 | 1 | Precision 500 mA 5V regulator | https://www.st.com/resource/en/datasheet/l78m.pdf |
| U5 | TDA7052A | 1 | 1 W BTL mono audio amplifier | https://www.nxp.com/docs/en/data-sheet/TDA7052A_AT.pdf |
Following additional items are necessary to build and test this system.
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9V or 12V 500mA DC power supply
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8Ω 2W full-range speaker
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Straight key or Iambic paddle key
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1.5m USB AB cable
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3.25mm TR jack
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6.35mm TRS jack
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5.5mm × 2.1mm DC jack
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Pair of button caps for SW2 and SW3
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PC with Linux or Windows operating system