Simple, portable automatic antenna tuner
ATU is an open-source printed circuit board by hmatuschek, from the hmatuschek/ATU repository on GitHub. It is a 4-layer board of 100 × 100 mm with 127 parts on 91 nets, routed with 593 tracks and 175 vias.
It is built around the ATMEGA328-AU, MCP1703A-5002E/CB and 1N4148W, with the MMBT3904, BAT54W and BZX84C5V1 among its other parts. Its parts include 35 resistors, 27 capacitors, 21 diodes, 14 switches and 12 transistors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
This is a first prototype for a QRP automatic antenna tuner. The final revision should provide
The first prototype lacks the battery and bistable relays. Hence, it is just a platform to develop and optimize the firmware.
(c) 2020, Hannes Matuschek, DM3MAT, dm3mat (at) darc (dot) de
The firmware and hardware are published under Creative Commons License SA-BY 4.0. See LICENSE file for details.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | 100n | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C23, C24, C26 |
| 14 | 10k | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R6, R8, R11, R16, R17, R18, R21, R22, R25, R26, R29, R30, R33, R34 |
| 12 | 100k | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R5, R7, R9, R10, R19, R20, R23, R24, R27, R28, R31, R32 |
| 12 | 1N4148W | Diode_SMD:D_SOD-123 | D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16 |
| 12 | G5V-1 | Relay_THT:Relay_SPDT_Omron_G5V-1 | K1, K2, K3, K4, K5, K6, K7, K8, K9, K10, K11, K12 |
| 12 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12 |
| 5 | 1.5k | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R12, R13, R14, R15, R35 |
| 4 | 10n | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C6, C7, C8, C9 |
| 4 | GND | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2, H3, H4 |
| 3 | 1u | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C21, C22, C25 |
| 2 | 51 | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R2, R3 |
| 2 | 68k | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R1, R4 |
| 2 | BAT54W | Package_TO_SOT_SMD:SOT-323_SC-70 | D1, D4 |
| 2 | BZX84C5V1 | Diode_SMD:D_SOT-23_ANK | D2, D3 |
| 1 | 0.1u | DM3MAT:L_Toroid_Vertical_L10.0mm_W5.0mm_P5.08mm_Diagonal | L1 |
| 1 | 0.22u | DM3MAT:L_Toroid_Vertical_L10.0mm_W5.0mm_P5.08mm_Diagonal | L2 |
| 1 | 0.47u | DM3MAT:L_Toroid_Vertical_L10.0mm_W5.0mm_P5.08mm_Diagonal | L3 |
| 1 | 1.0u | DM3MAT:L_Toroid_Vertical_L10.0mm_W5.0mm_P5.08mm_Diagonal | L4 |
| 1 | 100p | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C4 |
| 1 | 100u | Capacitor_SMD:CP_Elec_6.3x5.8 | C27 |
| 1 | 100u | Capacitor_SMD:C_1210_3225Metric_Pad1.42x2.65mm_HandSolder | L7 |
| 1 | 10p | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C1 |
| 1 | 12-15V | Connector_BarrelJack:BarrelJack_Wuerth_6941xx301002 | J4 |
| 1 | 2 x 1:10 T | DM3MAT:Transformer_Current-Sense_Binocular | T1 |
| 1 | 2.2u | DM3MAT:L_Toroid_Vertical_L10.0mm_W5.0mm_P5.08mm_Diagonal | L5 |
| 1 | 220p | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C5 |
| 1 | 22p | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C2 |
| 1 | 4.7u | DM3MAT:L_Toroid_Vertical_L10.0mm_W5.0mm_P5.08mm_Diagonal | L6 |
| 1 | 47p | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C3 |
| 1 | <1.5 | LED_THT:LED_D3.0mm_Horizontal_O1.27mm_Z2.0mm | D20 |
| 1 | <2.0 | LED_THT:LED_D3.0mm_Horizontal_O1.27mm_Z2.0mm | D19 |
| 1 | <2.5 | LED_THT:LED_D3.0mm_Horizontal_O1.27mm_Z2.0mm | D18 |
| 1 | >2.5 | LED_THT:LED_D3.0mm_Horizontal_O1.27mm_Z2.0mm | D17 |
| 1 | ACT | LED_THT:LED_D3.0mm_Horizontal_O1.27mm_Z2.0mm | D21 |
| 1 | ATmega328-AU | Package_QFP:TQFP-32_7x7mm_P0.8mm | U2 |
| 1 | AVR-ISP-6 | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J5 |
| 1 | IN | Connector_Coaxial:BNC_Amphenol_B6252HB-NPP3G-50_Horizontal | J1 |
| 1 | MCP1703A-5002 | Package_TO_SOT_SMD:SOT-89-3 | U1 |
| 1 | OUT | Connector_Coaxial:BNC_Amphenol_B6252HB-NPP3G-50_Horizontal | J2 |
| 1 | RST | Button_Switch_THT:SW_Tactile_SPST_Angled_PTS645Vx83-2LFS | SW2 |
| 1 | TUNE | Button_Switch_THT:SW_Tactile_SPST_Angled_PTS645Vx83-2LFS | SW1 |
It measures 100 × 100 mm and has 4 copper layers, 1.6 mm thick.
127 parts, built around the ATMEGA328-AU, MCP1703A-5002E/CB, 1N4148W and MMBT3904. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the hmatuschek/ATU repository on GitHub, at the commit this page was made from: the board is hardware/ATU.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask hmatuschek before reusing the design.
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