scientific calculator circuit

microcontroller How does this power supply circuit work? (MCU + LM317)

The filter consisting of resistors R1, R2, and capacitor C1 integrates the PWM waveform. The purpose of the operational amplifier appears to be that of a non-inverting amplifier, with the gain determined by resistors R6 and R7. However, the need...

the remote intellectual pronunciation anti-theft alarm system design of the one-chip computer

Precautions must be taken against low safety coefficients, as the applicable space for security measures continues to shrink. With advancements in science and technology, innovations such as magnetic door sensors, touch-type systems, radar monitoring, and infrared detection have emerged, leading...

DIAL ALARM-1

This is the lowest cost dialing alarm on the market and shows what can be done with an 8-pin microcontroller. The complete circuit is shown below. You cannot see all the features of this project by looking at the circuit...

Keypad Combination Lock circuit

This simple circuit is the electronic version of the combination lock. Using the special purpose LS7220 digital lock IC, the circuit allows a 4 digit combination of your choice to activate a relay for a set period of time. This...

pc based digital ic tester

Check the following ICs: 7400, 7402, 7404, 7408, 7432, 7486. A Visual Basic program is utilized to display the results on the PC. The microcontroller AT89S52 receives the IC number from the PC, verifies the logic gates with the truth...

The embedded microcontroller MC68HC912B32 background debugs the mode to design

The widespread application of Flash technology in microprocessors has led to significant advancements in the development and utilization of one-chip computers. Designers have transitioned from traditional in-circuit emulators (ICE) and JTAG interfaces to more cost-effective and user-friendly development methods. While...

Telephone call meter using calculator & COB

A simple calculator, in conjunction with a chip-on-board (COB) from an analogue quartz clock, is utilized to create a telephone call meter. The calculator facilitates the conversion of STD/ISD calls into local call equivalents and consistently displays the current local...

doorbel

This smart doorbell system is designed for use in industrial environments. It is microcontroller-based and controls a horn and a flashlight. The smart doorbell system utilizes a microcontroller to manage its operations, making it suitable for industrial applications where reliability and...

Microcontroller interface electrometer

A method for measuring static electricity for a science project was sought. An old copy of "Getting Started in Electronics" by Forrest M. Mims III was referenced for guidance. To create a static electricity measurement circuit, a simple design can be...