Arcade Joystick is a DIY USB keyboard encoder made with PIC18F24K50 microcontroller. It allows you to create a USB arcade stick for example or use it in a special MAME cabinet. It has easy, cheap and simple hardware to build yourself. Features of Arcade Joystick Circuit One additional input for autofire button. The speed of…
PT2399 circuit Heavy filtering allows for useful delay times and typical analog-like sound. The delay line starts just after 100n (after J112 JFET transistor). This capacitor is just a coupling capacitor to block DC, JFET acts as a switch to allow or not allow audio to pass. If you cut the PCB board by a…
Arduino Three channel thermostat circuit uses 3 digital temperature sensors DS18B20 for measurement, an encoder module and an LCD2004 LCD with I2C module as an indicator. Arduino Nano Three channel thermostat circuit control is simple, settings are made using the encoder button. The first, second and third lines of the LCD2004 screen (with I2C module)…
A circuit that makes mouse clicks at random times with ATmega8 microcontroller instead of programs known as Mouse Clicker or Automatic mouse click. To make it look like a real mouse click of a person. Clicks were made randomly from 800 ms to 1200 ms (delay between clicks) and 150 ms to 350 ms (click…
I don’t know about ultrasonic welding for plastic, but there are projects that can be useful for those who are interested. The appropriate ultrasonic with sufficient power in the application is 60W at 68kHz, disassembled from an ultrasonic cleaner. A lower frequency is more suitable. PVC welding The ultrasonic transducer behaves approximately like a series…
With mechanical modification and LM324 mosfet motor driver circuit, the battery has expired and the switch has been broken and the rechargeable drill has been converted into an engraving machine. There is a two-stage planetary gear box between the motor and the holder section, reducing the speed by 12 times. An arrangement has been made…
The motor driver circuit controlled by TL494 PWM IC is 36V 864W and its maximum over-power is 1800W. Lithium-ion (Li-ion) batteries are used for the power supply. Ten cells are used in series to ensure that the battery voltage is close to the nominal voltage of the motor, thus creating a source with a nominal…
The password electronic lock circuit PIC16F628A can store up to 128 users’ passwords. Users can change their passwords whenever they want. PIC16F628 and external Eeprom 24c08 are used to store these passwords. 2×16 LCD is used to display system messages. A piezoelectric buzzer that makes “beep sounds” is used to indicate the number pressed and…
A project made for the use of Scrap Laminator as a PCB laminator. The heating resistance control in the cylinder of the laminator is provided by BTA12 triac, LM339 op amp is used in the heat control circuit, MOC3052 is used for the track driver. A step motor is used to control the roll rotation…
I prepared a PCB for the Simple Switch Mode Power Supply Self Osc ATX Transformer that I shared before. It is compatible with the battery boxes of many drills. Apart from the PCB design, the tests were very challenging, I encountered interesting problems and saw strange events especially in electronics repair work. The problem of…