2 layers
BenchPowerSupply
evarty/KiCADPCB
This is the PCB design for various projects. Some have associated uC code, but that is seperate. There are seperate repos for some projects under evarty. A number of these have GCode as well.
29 partsGPL-3.0
2 layers203.2 × 135.9 mm
Preamp
oco2000/AVRForth4Forth for AVR microcontrollers
- Size
- 203.2 × 135.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 75
- Nets
- 76
- Pads
- 242
- Tracks, vias
- 457, 32
- Pours
- 8
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 3 Oct 2019
- Updated
- 8 May 2026
Overview
Preamp is an open-source printed circuit board by oco2000, from the oco2000/AVRForth repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 203.2 × 135.9 mm with 75 parts on 76 nets, routed with 457 tracks and 32 vias.
It is built around the ATMEGA8A-PU, DS1307+ and LM7805, with the LM7809CT among its other parts. Its parts include 28 capacitors, 18 connectors, 14 resistors, 5 ICs and 2 transistors. It belongs with the audio and music boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
4
ATMEGA8A-PU
DIP-28-300mil-40℃~+85℃ 10bit 16MHz 1KB 2.7V~5.5V 23 512Byte 8 Bit 8KB AVR Built-in FLASH DIP-28-300mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
DS1307+
DIP-80℃~+70℃ 300nA 4.5V~5.5V Backup power management and battery charging、InsideSRAM/NVRAM、Programmable clock output External I2C DIP-8 Real Time Clocks ROHSMaxim Integrated (Analog Devices)Real Time Clocks
LM7805
TO-2630℃~+125℃ 1 1A 20V 2V 42uV 5V 62dB@(120Hz) 8mA Fixed Over Temperature Protection、Short Circuit Protection Positive TO-263 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSYONGYUTAIVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
LM7809CT
TO-220-30℃~+125℃@(Ta) 1 1.5A 35V 56dB@(120Hz) 58uV 9V Fixed Positive Short Circuit Protection、Thermal shutdown TO-220-3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSHGSEMIVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdParts
75| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 100nF | Capacitor_THT:C_Rect_L9.0mm_W2.5mm_P7.50mm_MKT | C1, C2, C18, C19, C20, C21, C22, C24, C25, C26 |
| 9 | 2.2uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C3, C4, C5, C6, C7, C10, C11, C12, C17 |
| 9 | Conn_01x04 | Connector_JST:JST_EH_B4B-EH-A_1x04_P2.50mm_Vertical | J1, J2, J3, J4, J5, J6, J7, J8, J10 |
| 7 | 1k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R1, R2, R3, R4, R5, R6, R7 |
| 5 | 100uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C13, C14, C15, C16, C28 |
| 4 | 10k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R8, R10, R11, R12 |
| 3 | CONN_01X03 | Connector_JST:JST_EH_B3B-EH-A_1x03_P2.50mm_Vertical | J11, J15, J16 |
| 3 | Conn_01x03 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-3-3-5.08_1x03_P5.08mm_Horizontal | J12, J13, J14 |
| 2 | . | Package_TO_SOT_THT:TO-92_HandSolder | Q1, Q2 |
| 2 | 0.33uF | Capacitor_THT:C_Rect_L9.0mm_W2.5mm_P7.50mm_MKT | C8, C9 |
| 2 | 2.7nF | Capacitor_THT:C_Rect_L9.0mm_W2.5mm_P7.50mm_MKT | C23, C27 |
| 2 | 5.6k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R13, R14 |
| 1 | 47k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R9 |
| 1 | ATMEGA8A-PU | Package_DIP:DIP-28_W7.62mm_LongPads | U1 |
| 1 | AVR-ISP-10 | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | CON1 |
| 1 | Battery_Cell | Battery:BatteryHolder_Keystone_103_1x20mm | BT1 |
| 1 | CONN_01X03 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-3-3-5.08_1x03_P5.08mm_Horizontal | J17 |
| 1 | Conn_01x03 | Connector_JST:JST_EH_B3B-EH-A_1x03_P2.50mm_Vertical | J9 |
| 1 | Crystal | Crystal:Crystal_AT310_D3.0mm_L10.0mm_Horizontal | Y1 |
| 1 | DS1307+ | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | LM7805 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown | U3 |
| 1 | LM7809CT | Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown | U4 |
| 1 | TDA7313 | Package_SO:SOIC-28W_7.5x18.7mm_P1.27mm | U5 |
The 69 most common of 75 parts.
Questions
How big is the Preamp PCB?
It measures 203.2 × 135.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Preamp use?
75 parts, built around the ATMEGA8A-PU, DS1307+, LM7805 and LM7809CT. 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 Preamp KiCad files?
From the oco2000/AVRForth repository on GitHub, at the commit this page was made from: the board is examples/preamp/cad/preamp.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Preamp design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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