HardLabs

Bias

FordPrfkt·KT88-Amp·Boards/Bias/Bias.kicad_pcb

Bias PCB layout, top view — open source board by FordPrfkt

About the Bias PCB

Bias is an open source PCB design by FordPrfkt, published on GitHub. It is a 2-layer board measuring 80 × 50 mm, with 36 components from 18 distinct parts.

Other key parts include the LM339. By type, the board carries 14 resistors, 13 diodes, 5 capacitors, 1 IC and 1 connector.

It belongs with the audio designs in this gallery.

From the project

Tube Amplifier using KT88 Tubes based on BlackCat

Main components on the Bias

LM339

Bias bill of materials (BOM)

36 components, 18 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LM339
U1
1
Conn_01x08
J1
2
10k
RV1, RV3
1
LED_ZV_R1
D1
6
1N4148
D3, D6, D11, D15, D18, D23
1
LED_ZW_R1
D5
1
LED_OK_R1
D7
1
LED_ZV_R2
D13
1
LED_ZW_R2
D17
1
LED_OK_R2
D19
1
ZD5
D25
5
100nF
C1, C2, C3, C4, C5
6
4k7
R1, R3, R7, R11, R15, R19
3
10k
R2, R4, R22
2
1M
R5, R17
1
6k8
R21
1
60R4
R23
1
562R
R24

Bias design files

The KiCad project lives in the FordPrfkt/KT88-Amp repository on GitHub; these links point at the commit this page was built from.

Bias: common questions

How big is the Bias PCB?

The Bias measures 80 × 50 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Bias?

36 components, from 18 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Bias design files?

From the FordPrfkt/KT88-Amp repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Bias design in my own project?

The repository has no license, so all rights stay with FordPrfkt. Use it as a reference, and ask the author before reusing the design.

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