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Multifunctional test pen

Overview

I. Existing Functionality

: Continuity measurement, threshold resistance
diode measurement, conduction voltage measurement, and a diode that smokes (true).
PWM output,
PWM input
, DC output, outputting a specified voltage.

II. Remaining Issue:
In the diode continuity measurement function, one diode and MOSFET smoke, while other functions work normally. The reason is unclear; the voltage is normal.
I forgot to provide pads for the battery pins when designing the board, so I had to use other pads.
III. Component Replacement Ideas:
Due to the high price and shipping costs of the probe pins and connector, and a lack of funds, I used long header pins instead (surprisingly, they worked well). I used an alligator clip for the connector, which is very convenient (another DuPont wire could be added).
Illustration:

VID_20231127_121131.mp4

PDF_Multifunctional Test Pen.zip

Altium Multi-functional Test Pen.zip

PADS_Multifunctional Test Pen.zip

BOM_Multifunctional Testing Pen.xlsx

96969

MINI Lithium Battery Protection Board 1S-3S

Lithium battery protection boards, including single-cell protection boards, 2-cell protection boards, and 3-cell protection boards in modular form. Low power consumption
supports the following protection functions:
1. Over-discharge protection;
2. Overcharge protection;
3. Overcurrent protection
; 4. Short circuit protection.

The functions of the 1S and 2S boards have been verified. The 3S chip has been ordered but has not yet arrived, so it cannot be tested at the moment.

PDF_MINI Lithium Battery Protection Board 1S-3S.zip

Altium_MINI Lithium Battery Protection Board 1S-3S.zip

PADS_MINI Lithium Battery Protection Board 1S-3S.zip

BOM_MINI Lithium Battery Protection Board 1S-3S.xlsx

96971

PAM8403 power amplifier

Low-cost Class D amplifier board

The PAM8403 is a compact, low-cost amplifier board that supports 3W dual-channel audio playback.

PDF_PAM8403 power amplifier.zip

Altium_PAM8403 power amplifier.zip

PADS_PAM8403 power amplifier.zip

BOM_PAM8403 power amplifier.xlsx

96972

electronic

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:2026-03-27 12:53:53

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