Design Your Own LCD Clock, Electronic Mosquito Repeller, and more with the Schematics tool

Design Your Own LCD Clock, Electronic Mosquito Repeller, and more with the Schematics tool

- maio 30, 2014

Latest Circuit Designs

May 30, 2014

Simple Logic Gates Combination Lock

The 74AHC86; 74AHC02 are high-speed Si-gate CMOS devices and are pin compatible with Low-power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74AHC86; 74AHC02 provides a 2-input exclusive-OR and NOR function respectively.

Bidirectional 12C Level Translator

The PCA9306 allows bidirectional voltage translations between 1.2 V and 5V, without the use of a direction pin. The low ON-state resistance (ron) of the switch allows connections to be made.

Logic Probe with Pulse

This simple circuit is a logic probe with the ability to indicate the presence high voltage, low voltage, and even the presence of a pulse. This circuit will indicate the presence of pulse for a signal with a duration of 200 milliseconds. The circuit uses the 74ABT00DB quad 2-input NAND gate as the main logic components.

Battery-Powered Mobile Alarm System

This circuit is an Input/Output expander circuit for microcontrollers and other digital data processing devices. It also manages the voltage levels between devices.The circuit design is ideal for controlling a lot of devices such as home automation.

Electronic Mosquito Repeller

This circuit is built to repel mosquito using high frequency sound. The design is comprised of LM555 timer which provides the pulse generation and precision timing. It is also a stable controller capable of monostable or astable operation. The 74HCT4017BQ device is a Johnson decade counter with 10 decoded outputs. It provides the signal to be fed into the 555 timer which is connected to the output piezo speaker.

Guitar String Tuner

This project is a guitar tuner using lights that produce different frequencies similar to the guitar string’s pitches. This project is more accurate compared to other tuners that require sound analysis, which has the disadvantage of being imprecise because of its noise sensitivity.

Water Level Pump Control

This circuit will power up a water pump when the water reaches a predetermined level. Then it turns itself off when the water recedes to another predetermined point. The three gates of U1 each have their two inputs tied together, and serve as probes. The probes are then placed at various levels to trigger a particular function at a predetermined time.

4-digit LCD Clock

This project uses an IC PCF1175CT, specialized for clock applications. PCF1175CT is a single chip, 4.19MHz CMOS clock circuit providing hour and minute functions with 12-hour or 24-hour mode. It is designed to drive a 4-digit multiplexed data (duplex) to the LCD (liquid crystal display), having 13 output pins to be used for 26 output signals.

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