supremeOne

Ruler with various circuit design knowledge memos

Overview

# Content Description

1. Ruler in mm units from zero to 25cm
2. Ruler in mil units from zero to 4000mil
2. Protractor
3. Common inch length indicators, such as 0.025''= 0.635mm, 0.05'' = 1.27mm, 0.1' ' = 2.54mm
4. Common mm width indication
4. Schematic diagram and working status of PNP and NPN transistors
5. Color ring resistance memo
6. Current line width memo (1oz thickness)
7. AWG specification wire diameter indication
8. Common resistors, Capacitor, inductor and chip IC package specification instructions.
![IMG_20220421_141427.jpg]

![IMG_20220421_141442.jpg]

# Supplement

1. The JLCJLCJLCJLC on the right side of the front can be used for guest editing;
2. Use white for proofing silk screen.

# Reference open source project

* Functional scale, Ma Chenghua, [https://oshwhub.com/macheng/gong-neng-xing-ke-du-chi](https://oshwhub.com/macheng/gong-neng- xing-ke-du-chi)
* PCB component packaging ruler, Mobyw, [https://oshwhub.com/Mobyw/PCByuan-jian-feng-zhuang-chi](https://oshwhub.com/Mobyw/PCByuan- jian-feng-zhuang-chi)
* Line width current encapsulation equipment forget ruler, prism, [https://oshwhub.com/prism/PCBchi-zi](https://oshwhub.com/prism/PCBchi-zi)
* Lichuang EDA ruler (PCB ruler), OSHWHub open source hardware, [https://oshwhub.com/OSHWHubkai-yuan-ying-jian/li-chuangeda-chi-zi](https://oshwhub.com/OSHWHubkai- yuan-ying-jian/li-chuangeda-chi-zi)

Design Files

All reference designs on this site are sourced from major semiconductor manufacturers or collected online for learning and research. The copyright belongs to the semiconductor manufacturer or the original author. If you believe that the reference design of this site infringes upon your relevant rights and interests, please send us a rights notice. As a neutral platform service provider, we will take measures to delete the relevant content in accordance with relevant laws after receiving the relevant notice from the rights holder. Please send relevant notifications to email: bbs_service@eeworld.com.cn.

It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-07-15 21:37:41

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