Attenuator3c
About the Attenuator3c PCB
Attenuator3c is an open source PCB design by krzys9876, published on GitHub under the MIT license. It is a 2-layer board measuring 76.2 × 41.9 mm, with 14 components from 10 distinct parts.
Other key parts include the MCP23017_SO and ULN2803A. By type, the board carries 5 connectors, 3 ICs, 3 capacitors and 3 resistors.
It belongs with the power & battery designs in this gallery, and the repository also holds 2 earlier revisions of it.
From the project
HTPC, Volumio player, power amp, power supply etc.
This is a dump of various files related to the devices that I use in my home entertainment setup.
A miniITX PC enclosed in custom case (see: modushop.pl). The PC is fanless, so I had to choose a relative low power processor and a good radiator. However, since I have a overhead projector with a loud fan it doesn't matter at all.
A Raspberry Pi based Volumio player (see: volumio.com) enclosed in custom case. There are two Pis: one is a controller for two displays, the other is the actual player.
Main components on the Attenuator3c
Attenuator3c bill of materials (BOM)
14 components, 10 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MCP23017_SO | SOIC-28W_7.5x17.9mm_P1.27mm | U1 |
| 2 | ULN2803A | SOIC-18W_7.5x11.6mm_P1.27mm | U2, U3 |
| 1 | POWER | TerminalBlock_RND_205-00012_1x02_P5.00mm_Horizontal | J1 |
| 1 | I2C | PinHeader_2x02_P2.54mm_Vertical_SMD | J2 |
| 1 | Conn_Addr | PinHeader_2x03_P2.54mm_Vertical_SMD | J3 |
| 1 | RELAY | PinHeader_2x08_P2.54mm_Vertical_SMD | J4 |
| 1 | POWER2 | TerminalBlock_RND_205-00012_1x02_P5.00mm_Horizontal | J5 |
| 2 | 100n | C_1206_3216Metric | C1, C3 |
| 1 | 10u | C_1210_3225Metric | C2 |
| 3 | R | R_0805_2012Metric | R1, R2, R3 |
Attenuator3c design files
The KiCad project lives in the krzys9876/htpc_rig repository on GitHub; these links point at the commit this page was built from.
Attenuator3c: common questions
How big is the Attenuator3c PCB?
The Attenuator3c measures 76.2 × 41.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Attenuator3c?
14 components, from 10 distinct parts. The full bill of materials is listed on this page.
Where can I download the Attenuator3c design files?
From the krzys9876/htpc_rig repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Attenuator3c design in my own project?
Yes, under the terms of its MIT license, which krzys9876 chose for the repository.
More boards in htpc_rig
Pre relay
171.2 × 52.7 mm71 parts2LMIT0
Attenuator
150.4 × 53.5 mm66 parts2LMIT0
AVR/ArduinoControl
62.7 × 35.6 mm40 parts2LMIT0
Atten rotary v01
109.2 × 55.9 mm31 parts2LMIT0
Pre relay2
172.7 × 59.7 mm25 parts2LMIT0
Source rotary
27.8 × 25.2 mm16 parts2LMIT0
Pre power
71.8 × 22 mm10 parts2LMIT0
Earlier revisions in the repo: attenuator3, attenuator2
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