2 layers60.5 × 54 mm
2 layers14 × 16 mm
Wv soft latch
GravisZro/wv_soft_latchWide Voltage Soft Latch
- Size
- 14 × 16 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 8
- Nets
- 8
- Pads
- 23
- Tracks, vias
- 35, 1
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 3 Oct 2021
- Updated
- 3 Oct 2021
Overview
Wv soft latch is an open-source printed circuit board by GravisZro, from the GravisZro/wv_soft_latch repository on GitHub. It is a 2-layer board of 14 × 16 mm with 8 parts on 8 nets, routed with 35 tracks and 1 via.
It is built around the BZX84-C10, MMBT5551L and SI01P10. Its parts include 3 resistors, 2 diodes, 2 transistors and 1 connector.
Main components
3README
README.mdWide Voltage Soft Latch
This simple circuit is designed to be a safe (low current) way of activating a battery-based circuit for up to 100V. A momentary switch connecting the Switch pin to GND activates the circuit.
Details
- Minimalistic: only 7 components
- Connects directly to a battery
- Intended to turn on volatage regulator (up to 1A) for an MCU
Enablepin connects to an MCU to allow for the circuit to deactivate itself
Notes
- The circuit relies on an MCU to pull the
Enablepin low, therefore to ensure proper operation, during initalization the MCU should...
- Check if the MCU was reset by the watchdog timer (AVR uses an
MCUCSRflag) and pull theEnablepin either high or low, depending on the state. - Set the MCU's watchdog timer which will automatically reset the MCU (and thus turn off the circuit) if your code gets stuck.
- Cheap 0.1" pins typically max out at 3A and 100V, so if you modify this for current exceeding 3A or voltage exceeding 100V then either integrate it into your circuit or select pins carefully.
Schematic
PCB
Parts
8| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 100kΩ | Resistor_SMD:R_0805_2012Metric | R1, R3 |
| 1 | 100V | Diode_SMD:D_SOT-23_ANK | D1 |
| 1 | 1MΩ | Resistor_SMD:R_0805_2012Metric | R2 |
| 1 | BZX84-C10 | Diode_SMD:D_SOT-23_ANK | D2 |
| 1 | Conn_01x05 | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J1 |
| 1 | MMBT5551L | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | SI01P10 | Package_TO_SOT_SMD:SOT-23 | Q1 |
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Questions
How big is the Wv soft latch PCB?
It measures 14 × 16 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Wv soft latch use?
8 parts, built around the BZX84-C10, MMBT5551L and SI01P10. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Wv soft latch KiCad files?
From the GravisZro/wv_soft_latch repository on GitHub, at the commit this page was made from: the board is wv_soft_latch.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Wv soft latch design in my own project?
Its repository states no licence, so its author keeps all rights: ask GravisZro before reusing the design.