Radio & Television Magazine 50th Anniversary Edition Headphone Amplifier

Introduction: Op amp + Class AB transistor Buffer headphone amplifier

Schematic PCB

USB sound card + Bluetooth 5.0 module (the actual product has been made and the function has been verified)

Introduction: Use pcm2706 to convert USB to IIS, pcm1794a as DAC: and then use BTM308 Bluetooth module to design a Hifi sound card with Bluetooth function.

Schematic PCB

TDA7850 power amplifier board + protection module two-in-one solution (the actual product has been made and the function has been verified)

Introduction: TDA7850 power amplifier board + protection module two-in-one solution

Schematic PCB

Multifunctional electronic crossover preamplifier (the actual product has been made and the function has been verified)

Introduction: Electronic frequency division

Schematic PCB

LED control circuit

Introduction: A powerful, simple and practical LED lighting circuit

Schematic PCB

PASSZEN amplifier board

Introduction: PASS Class A amplifier

Schematic PCB

triode circuit learning board

Introduction: Three-stage tube circuit learning board, all components can be installed pluggable, making it easy to adjust parameters. Integrated LDO buck chip.

Schematic PCB

PASS amplifier

Introduction: PASS ACA single-ended Class A FET power amplifier board

Schematic PCB

PASS ACA single-ended Class A FET amplifier

Introduction: PASS ACA single-ended Class A FET amplifier

Schematic PCB

Filter module based on op amp AD8039

Introduction: This project uses the general-purpose operational amplifier AD8039 (C235995) to implement a 20k high-pass filter. The circuit is highly expandable. You can only replace the resistor components to transform the circuit into a low-pass filter.

Schematic PCB

USB to RS232 module based on CH340T

Introduction: This project is based on CH340T (C8689) and ADM213EARS-REEL (C6168) to realize USB to nine-pin RS232 serial port.

Schematic PCB

AD603 based amplifier module

Introduction: This project is based on the voltage-controlled variable gain amplifier AD603 (C9815) and designs a 40dB fixed gain amplification circuit. The schematic diagram details how to change the structure to change the gain value.

Schematic PCB

Super mini low power zvs

Introduction: Super mini low power zvs, 2*2cm ultra small size

Schematic PCB

Compact resistance screening instrument

Introduction: Design a precision resistance screening circuit. The circuit should be able to identify and display qualified and unqualified resistors within a given resistance range based on the preset upper and lower limit errors, thereby achieving the purpose of screening resistors.

Schematic PCB

LM386 power amplifier

Introduction: Low voltage, low power consumption, small size, low noise floor mono audio power amplifier module

Schematic PCB

Iron Man PCB Colorful Board

Introduction: PCB ○ disk, the picture is a science fiction

Schematic PCB

100W LED flashlight constant current driver board based on LM3429

Introduction: A constant current power supply board with 12V~20V power supply and 3A output is designed. It is recommended to use four lithium batteries in series for power supply, 30V~36V 100-watt COB lamp beads, and AMD platform copper-free CPU radiator.

Schematic PCB

150W40A double-tube constant current electronic load based on LM324

Introduction: This project is an improvement on the popular LM324 electronic load on the market. It reduces the resistance value, increases the test current range, and uses type II compensation to improve loop stability (simetrix simulation)

Schematic PCB

40A 200W electronic load

Introduction: Improved version of 324 electronic load

Schematic PCB

non-contact pen

Introduction: This project is a non-contact electric pen that can detect whether there is power in the power grid without direct contact with the mains (live line).

Schematic PCB