8 line intercom using 89c51 circuit

High Resolution Digital Weigh-scale Design Using Z8 Encore! ?® Microcontrollers

The SP6691 circuit is designed to provide a high output voltage using a lower voltage boost regulator by incorporating a charge pump circuit. This configuration can convert a standard 30V boost regulator into a 60V boost regulator if necessary. Testing...

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...

DC motor driver for DCMP(AVR-008)

A microcontroller is used to control various types of DC motors, including permanent magnet DC motors, DC servo motors, and stepper motors. This project utilizes the AVR-008 microcontroller from Circuits-Home, which is frequently referred to as the 3-in-1 driver motor...

Eight-digit-microprocessor-display

The display interface utilizes the ICM7218A/B in conjunction with an 8048 family microcontroller. An 8-bit data bus (DBO/DB7-IDO/ID7) facilitates the transfer of control and data information to the 7218 display interface during successive WRITE pulses. The mode input pins on...

Protecting Microcontroller Input Pins from Soft Power Switch

A soft power switch for a microcontroller is designed such that a momentary switch can activate the circuit, including the microcontroller. When the switch is pressed a second time, the microcontroller is capable of shutting itself down after executing necessary...

Low-Cost and Simple Intercom

This is a low-cost and simple intercom circuit design that utilizes three transistors. Even a novice can assemble it on a piece of veroboard without difficulty. The intercom circuit is designed to facilitate two-way audio communication between two locations. The core...

The Link Telephone Intercom

It uses old pulse dial handsets and replaces the AC bell set with a 9 volt DC buzzer. The whole circuit runs from a 12 volt regulated DC supply and is suitable for short term battery operation (eg: Gel Cell)....

Telephone Intercom

The Link circuitry is simple and efficient, employing just two ICs, half a dozen transistors, and a handful of garden variety components. It all runs on 12 volts and is easily assembled. You can have your own home intercom between...

How to Design Battery Charger Applications that Require External Microcontrollers and Related System-Level Issues

Application note on designing linear and switch-mode (switching DC-DC converter current source) battery charger applications that require external microcontrollers and related system-level issues for notebook computers. The application note provides guidance on the design of both linear and switching DC-DC converter...