MFJ-1258 Capacitance Meter for Commodore VIC-20
About the MFJ-1258 Capacitance Meter for Commodore VIC-20 PCB
MFJ-1258 Capacitance Meter for Commodore VIC-20 is an open source PCB design by BrettHallen, published on GitHub. It is a 2-layer board measuring 78 × 54 mm, with 19 components from 13 distinct parts.
Other key parts include the NE555P. By type, the board carries 8 resistors, 3 transistors, 3 connectors, 2 capacitors and 1 IC.
It belongs with the retro computing designs in this gallery.
From the project
Hardware & information for the VIC-20
This piece of hardware was released in 1984 by MFJ Enterprises.
There is obviously no good reason to boot up your VIC-20, load the program and then measure a capacitor ... there are much faster ways to do it.
It is here mainly for education, showing how to interface software and hardware via the User Port.
I have re-drawn the schematic from the physical board - it is currently UNTESTED!
Main components on the MFJ-1258 Capacitance Meter for Commodore VIC-20
MFJ-1258 Capacitance Meter for Commodore VIC-20 bill of materials (BOM)
19 components, 13 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | NE555P | DIP-8_W7.62mm | U1 |
| 3 | 2N3906 | TO-92_Inline | Q1, Q2, Q3 |
| 1 | C64-USERPORT C64-UserPort | C64-User-Port-Female | J1 |
| 2 | SCREW_TERMINAL_01X01 Screw_Terminal_01x01 | Banana_Jack_1Pin | J2, J3 |
| 1 | 100Ω (101) | Potentiometer_Piher_PT-10-V10_Vertical | RV1 |
| 1 | 100KΩ (104) | Potentiometer_Piher_PT-10-V10_Vertical | RV2 |
| 2 | 10nF (103) | C_Disc_D5.0mm_W2.5mm_P2.50mm | C1, C2 |
| 1 | 510Ω | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 1.2MΩ | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 3 | 4.7KΩ | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R4, R5 |
| 1 | 5.6MΩ | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6 |
| 1 | 3.9MΩ | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7 |
| 1 | 330Ω | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8 |
MFJ-1258 Capacitance Meter for Commodore VIC-20 design files
The KiCad project lives in the BrettHallen/Commodore_VIC20 repository on GitHub; these links point at the commit this page was built from.
MFJ-1258 Capacitance Meter for Commodore VIC-20: common questions
How big is the MFJ-1258 Capacitance Meter for Commodore VIC-20 PCB?
The MFJ-1258 Capacitance Meter for Commodore VIC-20 measures 78 × 54 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the MFJ-1258 Capacitance Meter for Commodore VIC-20?
19 components, from 13 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 MFJ-1258 Capacitance Meter for Commodore VIC-20 design files?
From the BrettHallen/Commodore_VIC20 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 MFJ-1258 Capacitance Meter for Commodore VIC-20 design in my own project?
The repository has no license, so all rights stay with BrettHallen. Use it as a reference, and ask the author before reusing the design.
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