Relayhold board
About the Relayhold board
Relayhold board is an open source PCB design by bwack, published on GitHub under the CERN-OHL-1.2 license. It is a 2-layer board measuring 43.9 × 28.8 mm, with 18 components from 13 distinct parts.
By type, the board carries 7 resistors, 4 transistors, 3 connectors, 1 jumper, 1 relay and 1 diode.
It belongs with the retro computing designs in this gallery.
From the project
The addon board is for many hard to make. I was thinking, what about making a board that doesn't need to be programmed, that can cut 9VAC, and optionally keep the outputs disabled even if the fault goes away. This circuit is it. It was more of an experimental circuit. I've theref
The addon board is for many hard to make. I was thinking, what about making a board that doesn't need to be programmed, that can cut 9VAC, and optionally keep the outputs disabled even if the fault goes away. This circuit is it. It was more of an experimental circuit. I've therefor archived it here.
Relayhold board bill of materials (BOM)
18 components, 13 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | Q_PNP_BCE | TO-92_Inline_Wide | Q1, Q2 |
| 1 | BC337 | TO-92_Inline_Wide | Q3 |
| 1 | 2N7000 | TO-92_Inline_Wide | Q4 |
| 2 | Conn_01x08 | PinHeader_1x08_P2.54mm_Vertical | J1, J3 |
| 1 | Conn_01x04 | PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | Jumper_3_Open | PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 1 | SANYOU_SRD_Form_C | Relay_SPDT_SANYOU_SRD_Series_Form_C | K1 |
| 1 | RED_LED | LED_D5.0mm | D1 |
| 1 | 1u | C_Rect_L7.0mm_W2.5mm_P5.00mm | C1 |
| 3 | 100K | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R1, R2, R4 |
| 1 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R3 |
| 2 | 33K | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R5, R7 |
| 1 | 560 | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R6 |
Relayhold board design files
The KiCad project lives in the bwack/C64-Saver-bwack repository on GitHub; these links point at the commit this page was built from.
Relayhold board: common questions
How big is the Relayhold board?
The Relayhold board measures 43.9 × 28.8 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Relayhold board?
18 components, from 13 distinct parts. The full bill of materials is listed on this page.
Where can I download the Relayhold board design files?
From the bwack/C64-Saver-bwack repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Relayhold board design in my own project?
Yes, under the terms of its CERN-OHL-1.2 license, which bwack chose for the repository.
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