2 layers56.5 × 64.8 mm
OPL2 VGM Player
AidanHockey5/YM3812_VGM_Player
A Video Game Music player based on the YM3812 (OPL2) and Teensy 3.5
14 parts72AGPL-3.0
2 layers69.1 × 73.9 mm
Alarm Clock V1
alexandercote/Alarm_Clock_Audio_AmpDesign class project where I worked in a group of 3 to implement a music playing alarm clock using a microcontroller board.
- Size
- 69.1 × 73.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 88
- Nets
- 148
- Pads
- 295
- Tracks, vias
- 617, 6
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 1 May 2017
- Updated
- 7 Jun 2017
Overview
Alarm Clock V1 is an open-source printed circuit board by alexandercote, from the alexandercote/Alarm_Clock_Audio_Amp repository on GitHub. It is a 2-layer board of 69.1 × 73.9 mm with 88 parts on 148 nets, routed with 617 tracks and 6 vias.
It is built around the LM358N, LM386 and IRLIB9343PBF. Its parts include 33 resistors, 15 transistors, 12 capacitors, 6 connectors and 5 switches. It belongs with the lEDs and displays boards of this library.
Main components
3
LM358N
DIP-8-18V~18V 0℃~+70℃ 1.2MHz 10nA 2 30mA 3V~36V 50nA 7mV 800uA 80dB Built-in compensation DIP-8 Operational Amplifier ROHSHGSEMIOperational Amplifier
LM386
SOP-80.2% 0℃~+70℃ 4V~12V 4mA 50dB 700mWx1@8Ω Analog voltage gain SOP-8 Audio Amplifiers ROHSGcoreAudio Power OpAmps
IRLIB9343PBF
TO-220-40℃~+175℃ 1 P-Channel 14A 1V 31nC@10V 33W 55V 660pF 72pF 93mΩ@10V TO-220 MOSFETs ROHSInfineon TechnologiesMOSFETs
README
PCB/README.mdThe Circuit
Design Limitation:
- Have the following capacitors: 1nF, 10uF, 470uF and 100 nF
- Resistors: 5% Resistors.
- Input Voltage for audio input: [0-3V], DC voltage = 1.5V, with AC voltage = ± 0.3V.
- The audio input has source impedance of 20kΩ and has a maximum current source of 25mA.
- From the data sheet, the impedance of the speaker is 8Ω.
Schematic view of the top hierarchy view, including push button debouncing, with an audio amplifier and LED multiplexer in lower hierarchy schematics.
Audio Amplifier:
- Cascaded Low-Pass and High-Pass Filter to create a BandPass Filter with a pass band of 19.85Hz to 19.4kHz
- Using the LM386 without its gain pins connected will result in a voltage gain of 20. Since (20 * 0.5V) = 10V, which is higher than our source voltage, we need to voltage divide the input of LM386. (0.5V is the maximum input AC swing). Here, we chose a maximum voltage of 4.5V to make sure the gain stays linear. From that, we found our values for resistors in the voltage divider. A 100kΩ potientiometer was used to dynamically set the gain (and therefore the volume)The potentiometer will always show 100 kΩ to the High-Pass Filter, with the LM386 only seeing the resistance set in order to set the volume.
Schematic view of the audio amplifier schematic. Includes a low pass filter cascaded with a high-pass filter, a potentiometer for input voltage control, and an LM386 to amplify.
The schematic view of the LED multiplexing circuit:
The PCB (Two layer):
Top layer PCB view:
Top layer view from the manufacturer (OshPark):
Bottom layer PCB view:
Bottom layer view from the manufacturer:
Parts
88| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | 1 kΩ | Resistors_SMD:R_1206_HandSoldering | R5, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R27 |
| 10 | 100 nF | Capacitors_ThroughHole:C_Rect_L7_W2.5_P5 | C2, C3, C4, C5, C6, C7, C8, C9, C11, C12 |
| 8 | 100 Ω | Resistors_SMD:R_1206_HandSoldering | R19, R20, R21, R22, R23, R24, R25, R26 |
| 8 | 2N3906 | TO_SOT_Packages_THT:TO-92_Inline_Narrow_Oval | Q2, Q4, Q5, Q7, Q8, Q9, Q11, Q12 |
| 8 | TEST_1P | Pin_Headers:Pin_Header_Straight_1x01 | W1, W2, W3, W4, W5, W6, W7, W8 |
| 6 | 2N3904 | TO_SOT_Packages_THT:TO-92_Inline_Narrow_Oval | Q3, Q6, Q10, Q13, Q14, Q15 |
| 5 | 47 kΩ | Resistors_SMD:R_1206_HandSoldering | R29, R30, R31, R32, R33 |
| 5 | SW_PUSH | Pin_Headers:Pin_Header_Straight_1x02 | SW1, SW2, SW3, SW4, SW5 |
| 2 | ECE:STM32_F4_ConnV2 | P4, P5 | |
| 2 | 120 kΩ | Resistors_SMD:R_1206_HandSoldering | R2, R3 |
| 2 | CONN_01X02 | Pin_Headers:Pin_Header_Straight_1x02 | P1, P6 |
| 1 | 10 uF | Capacitors_ThroughHole:C_Disc_D3_P2.5 | C1 |
| 1 | 10 Ω | Resistors_SMD:R_1206_HandSoldering | R6 |
| 1 | 100 kΩ | Resistors_SMD:R_1206_HandSoldering | R4 |
| 1 | 470 uF | Capacitors_ThroughHole:C_Disc_D7.5_P5 | C10 |
| 1 | 6.2 kΩ | Resistors_SMD:R_1206_HandSoldering | R28 |
| 1 | 82 Ω | Resistors_SMD:R_1206_HandSoldering | R1 |
| 1 | CONN_01X05 | Pin_Headers:Pin_Header_Straight_1x05 | P2 |
| 1 | CONN_01X08 | Pin_Headers:Pin_Header_Straight_1x08 | P3 |
| 1 | IRLIB9343 | Power_Integrations:TO-220 | Q1 |
| 1 | LM358N | Housings_DIP:DIP-8_W7.62mm_LongPads | U1 |
| 1 | LM386 | Housings_DIP:DIP-8_W7.62mm_LongPads | U2 |
| 1 | POT: 100 kΩ | Pin_Headers:Pin_Header_Straight_1x03 | RV1 |
The 82 most common of 88 parts.
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Questions
How big is the Alarm Clock V1 PCB?
It measures 69.1 × 73.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Alarm Clock V1 use?
88 parts, built around the LM358N, LM386 and IRLIB9343PBF. 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.
Where can I download the Alarm Clock V1 KiCad files?
From the alexandercote/Alarm_Clock_Audio_Amp repository on GitHub, at the commit this page was made from: the board is PCB/Alarm Clock V1.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Alarm Clock V1 design in my own project?
Its repository states no licence, so its author keeps all rights: ask alexandercote before reusing the design.