Monitor flicker detection sensor

Introduction: A low-end version of the display flicker test sensor produced by opt101 is used with a portable oscilloscope to measure displays with a flicker frequency within 20khz.

Schematic PCB

Tits Simulation_Desktop Power

Introduction: Desktop power supply based on LM25116, programmable overcurrent protection, maximum input 40V, maximum current 5A, digital display of voltage and current

Schematic PCB

Tit simulation_resistance box

Introduction: An upgraded resistance box using coding switches; resistance range from 0 to 114514 ohms; suitable for parameter adjustment of signal level circuits.

Schematic PCB

Tits simulation_AD9833_DEMO

Introduction: AD9833 DDS verified version. Prepare for the signal generator below

Schematic PCB

All-resistance filter

Introduction: When God closes a door for you, he will also close the window. Just like this full-blocking filter, it alludes to my life. Maximum gain-160dB

Schematic PCB

Single section 18650LED driver unit

Introduction: 18650 management unit integrating charging, protection and LED constant current driver

Schematic PCB

Orz_STM

Introduction: STM (Scanning Tunneling Microscope) is an attempt to make a home-made scanning tunneling microscope.

Schematic PCB

TL431 open source

Introduction: Discrete TL431

Schematic PCB

Opamp-Simplistic

Introduction: Homemade simple operational amplifier, configured as a non-inverting amplifier circuit.

Schematic PCB

Tone Capsule Preamp

Introduction: Santu Guitar Laboratory Tone Capsule Bass Preamp

Schematic PCB

LM1875GC

Introduction: LM1875T reverse amplifier circuit

Schematic PCB

Lithium battery automatic polarity conversion

Introduction: Lithium battery automatic polarity recognition circuit

Schematic PCB

【RA】Based on Renesas MCU spectrum lamp +1051772A

Introduction: A music spectrum light based on the Renesas R7FA2L1AB2DFL microcontroller. It has Chinese character display and seven-color spectrum display functions, and displays brightness and air conditioning. Due to hardware limitations, it currently only has these functions.

Schematic PCB

Fully discrete μA741

Introduction: The uA741 operational amplifier is built with all discrete components. The circuit adopts a circuit of the original domestic LM741.

Schematic PCB

Fully discrete NE555

Introduction: The fully discrete NE555 is made with reference to the datasheet of the earliest version of NE555, and is connected with solder tabs; the pin layout is optimized, putting 2 and 6 pins together, and 7 pins near 2 and 6 pins to facilitate the formation of an astable oscillation circuit.

Schematic PCB

Fully discrete LM393

Introduction: The LM393 voltage comparator is built with all discrete components and uses open-drain output. The two sets of comparators share a current source.

Schematic PCB

Fully discrete LM324

Introduction: The LM324 operational amplifier is made of all discrete components. Four independent operational amplifiers share a constant current source. Measures are taken to prevent oversaturation and the static power consumption is low.

Schematic PCB

Reproduction of old domestic op amps - from F001 to F007

Introduction: The fully discrete version of the early domestic operational amplifiers reproduced from the Jingfeng manual, from F001, F002 to F007, can be said to be the earliest integrated operational amplifiers in my country. Currently, F001, F002, F003, F004, and F005 have been physically verified. Note: There is no schematic diagram for this project!

Schematic PCB

Dongfanghong Semiconductor Musical Instrument Version 3 (Reverse Engineering of Dongfanghong-1 Satellite Music System)

Introduction: Reverse engineering of the music system part of the Dongfanghong-1 artificial earth satellite telemetry system (currently under development)

Schematic PCB

Dongfanghong semiconductor player

Introduction: A fully automatic musical instrument improved based on the June 1971 edition of "Dongfanghong Semiconductor Musical Instrument". Without using any microcontroller or embedded controller, you can automatically play the entire song "The East Is Red"

Schematic PCB