https://github.com/pybash1/hc-solder

A PCB I made for Hack Club's Solder programme!
https://github.com/pybash1/hc-solder

Last synced: 29 days ago
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A PCB I made for Hack Club's Solder programme!

• Host: GitHub
• URL: https://github.com/pybash1/hc-solder
• Owner: pybash1
• Created: 2025-05-03T09:48:16.000Z (about 1 year ago)
• Default Branch: main
• Last Pushed: 2025-05-03T15:47:27.000Z (about 1 year ago)
• Last Synced: 2025-05-03T16:46:59.076Z (about 1 year ago)
• Size: 454 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# hc-solder

This is a mini touch sensor circuit using a simple NPN transistor. The circuit uses the human body's electrical resistance to complete the circuit, the small voltage from the body(when we touch the exposed pads) goes to the base of the transistor which then lets the current from the 9V battery pass onto the LED via the transistor.

By `@pybash` on Slack

# Schematic

![image](https://github.com/user-attachments/assets/4c9af207-c7cb-439a-8e22-e74e775d0c19)

# PCB

![image](https://github.com/user-attachments/assets/c6aa3a83-54d2-438e-bb96-3cd5436f90d7)

# 3D View

![image](https://github.com/user-attachments/assets/a14c4d7c-afac-4c40-b89c-f329a3401fe0)

# Real circuit

![image](https://github.com/user-attachments/assets/5ab7ab48-48ee-4034-9b75-413346ad4d1b)

# BOM

- 1 Battery holder

- 1 9V Battery

- 2 220ohm resistor

- 1 NPN transistor

- 1 Red LED

- 2 Mounting hold pads