In this post I have explained the pinout assignments and functions of the popular 433 MHz RF remote control module from HOLTEK. RF 315 MHz / 433 MHz Transmitter-receiver Module for Remote Control Application Making your own universal remote control systems today is very easy. Such procure the relevant chips, assemble them and here goes, […]
Archives for 2011
Simple Crowbar Circuits for Over-voltage Protection
A handful of simple DC over voltage protector crowbar circuits are discussed in this article. I have explained the working of each crowbar circuit through the following explanation. What is Crowbar Circuit If you are wondering what is a crowbar circuit, the definition is simple. It is a circuit network where a transistor or an […]
Making a Pyrometer Circuit
To make a furnace temperature meter, the sensing element is required to be particularly robust so that it is able to withstand the extreme high temperatures generally developed in furnaces and ovens. What is a Furnace The circuit of a pyrometer explained here is based on a thermocouple principle which can be used to read […]
FM Wireless Microphone Circuit – Construction Details
A wireless microphone is a portable electronic microphone which allows the user to transmit its voice to an amplifier without any wire connection, hence the name wireless microphone. Making a wireless mic at home can be real fun, here I have explained one such simple project which can be used for recording and paying back […]
Make an LED AC Voltage Indicator Monitor Circuit
The LED AC mains voltage level indicator is a circuit that can be used for displaying and monitoring the instantaneous voltage level of any 220 V or 120 V mains home AC input, through a correspondingly rising and falling LED bar graph. A simple construction and accurate result are the main features of this tiny […]