free ruler

Introduction: Get started with free rulers

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Single power supply TDA2030A power amplifier

Introduction: Simple 2030 amplifier

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New version of 200W Class A and B high power amplifier

Introduction: Power Amplifier

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Desktop dual power supply 2030, 1875 amplifier

Introduction: Desktop amplifier with 20 to 30 watts, zero power noise floor

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Car amplifier preamplifier

Introduction: The preamplifier removed from the car amplifier

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Car amplifier preamplifier

Introduction: A power amplifier preamplifier with sweet treble, thick bass, thick midrange, and accurate tone. Highly recommended.

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Power bank IP5358 fast charging board

Introduction: Support QC PD fast charging

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Optocoupler isolation sstc driver board

Introduction: sstc driver

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Amplifier gain adjustment preamp

Introduction: The front stage of the power amplifier board can adjust the volume and the size of the bass.

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Class D amplifier 1

Introduction: Digital power amplifier circuit, original author Zhou Guangx

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200W high power Class A and B power amplifier

Introduction: Peak 200W Class A and B power amplifier, power supply voltage can be ±20V-40V, ±35V-40V is recommended. If the voltage is too low, the power may not be enough. The power tube can be replaced with other triodes, but please pay attention to the parameters. The sound quality of this amplifier is very good

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200W Class A and B amplifier HIFI remastered version

Introduction: Modified the rubbish board I drew a few years ago

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N76E003AT20-T12 soldering iron hardware board

Introduction: N76E003AT20-T12 This version is functionally verified and can be used normally! Plus, the wiring can be optimized!

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Customized pc keypad, CH552 microcontroller HID keyboard, computer multimedia keypad

Introduction: Custom keyboard made using Qinheng CH552G microcontroller

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[LM358]DC constant current controller

Introduction: ATZ_CTRL01, CC constant current controller based on DC power supply produced by LM358

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【NFC】Universal IC-Pengpeng-CUID card

Introduction: This is an NFC card keychain that can hold meal cards, bus cards, access control, etc....

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HiFi player

Introduction: HiFi player handling based on Texas Instruments TPA6120A2

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Windows Hello

Introduction: The windows hello adapter board is actually a docking station.

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Mini power bank 18650

Introduction: Although it is Mini, it has powerful performance, Yingjixin IP5328P solution 18650 mobile power supply.

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ne5532D microphone preamplifier

Introduction: NE5532D microphone amplifier chip design

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