fV3bWPZ

Pocket Fan

Overview

The main feature is its compact fan size, making it pocket-sized and portable. It features 555 PWM speed control, with an internal resistor for adjusting the speed ratio. An external variable resistor further enhances the speed adjustment. The fan operates at 5V/0.2A (4025 fan), and a single 18650 battery provides approximately 8 hours of maximum power operation. Its small size, slightly smaller than a mobile phone, allows for easy pocket carrying. The casing is included in the accessories.

5V fan housing v27.stl

Fan cover v4.stl

PDF_Pocket Fan.zip

Altium_PocketFan.zip

PADS_PocketFan.zip

BOM_Pocket Fan.xlsx

94409

Real-world car chase lane switching_2024-05-01_18-27-39

Two inputs and one output 8-channel PWM signal switching module

Module control IC: ATtiny85, operating clock frequency 16MHz.
The program burning file is in the attachment.

Blink.ino.hex

PDF_Real-world Racing Track Switching_18-27-39.zip

Altium_Real-world Racing Track Switch_18-27-39.zip

PADS_Real-world Racing Track Switch_18-27-39.zip

BOM_Real-world car track switching_2024-05-01_18-27-39.xlsx

94413

SU-22T Offline Voice Development Board

Verification of the SU-22T module with intelligent mechanism, low power consumption, and direct connection to CH340C for downloading programs via Type-C.

1. SU-22T physical image

. 2. Improvements compared to the CI-03T offline voice development board: CI-03T development board link.
1. Replaced the speaker interface PH2.0 female connector for easier plugging and unplugging (the previous PH2.0 connector was too tight, causing damage to the PH2.0 wires during plugging and unplugging).
2. Added a diode between the communication lines of CH340 (TXD) and SU-22T (RXD) to prevent CH340 from flowing back current into SU-22T.
3. SU-22T program download instructions
will be added later; see the development package below for details.
4. Note
that D2's placement is not ideal, so you need to solder it together with the module and CH340. Do not solder D2 last, as the space is too small. If you have a hot air gun, then disregard this, hehe!

SU-22T Development Kit.zip

PDF_SU-22T Offline Voice Development Board.zip

Altium_SU-22T Offline Voice Development Board.zip

PADS_SU-22T Offline Voice Development Board.zip

BOM_SU-22T Offline Voice Development Board.xlsx

94414

LED Display

The main purpose of this array of lights is to check whether the components of the microcontroller are functioning properly after soldering.

I recently built several minimum system boards, and after finishing the microcontroller, they looked quite nice under fluorescent lights. However, one day I happened to hold one up to the sun and noticed some adhesion between the joints. This inspired me to create a board with integrated lighting to inspect the soldering of each joint. The board has a simple structure and can be directly fabricated. It can also be adjusted to meet specific needs.

PDF_Light Display.zip

Altium_Light Display.zip

PADS_LED Display.zip

BOM_Light Display.xlsx

94415

electronic

Design Files

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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:2026-03-28 13:16:15

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