Keithley TF70
About the Keithley TF70 PCB
Keithley TF70 is an open source PCB design by Bocuma747, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 27.8 × 9.5 mm, with 9 components from 8 distinct parts.
By type, the board carries 8 resistors and 1 connector.
It belongs with the test & measurement designs in this gallery.
From the project
A drop-in replacement PCB for the Keithley TF-70 resistor network found in Keithley 172A and 173A multimeters.
A drop-in replacement PCB for the Keithley TF-70 resistor network found in Keithley 172A and 173A multimeters. This is R615 in Rev B instruments, as found in the A/D converter section of the service manual.
Bill of materials is located in BOM.csv. For maximum performance, I recommend 0.1% tolerance resistors with the lowest temperature coefficient available. The header pins are generic right-angle header pins with 0.1" (2.54mm) pitch, the same as on breadboards.
Keithley TF70 bill of materials (BOM)
9 components, 8 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Conn_01x10_Pin | PinHeader_1x10_P2.54mm_Vertical | J1 |
| 1 | 39k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 2 | 7.5k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2, R3 |
| 1 | 330 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4 |
| 1 | 2.8k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5 |
| 1 | 4.87k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6 |
| 1 | 11.3k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7 |
| 1 | 15k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8 |
Keithley TF70 design files
The KiCad project lives in the Bocuma747/Keithley_TF70 repository on GitHub; these links point at the commit this page was built from.
- LayoutKeithley_TF70.kicad_pcb
- SchematicKeithley_TF70.kicad_sch
- BOMBOM.csv
Keithley TF70: common questions
How big is the Keithley TF70 PCB?
The Keithley TF70 measures 27.8 × 9.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Keithley TF70?
9 components, from 8 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 Keithley TF70 design files?
From the Bocuma747/Keithley_TF70 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 Keithley TF70 design in my own project?
Yes, under the terms of its GPL-3.0 license, which Bocuma747 chose for the repository.
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