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| Posted: 19 Jul 2011 05:59 AM PDT PLL Stereo FM transmitter circuit. BH1417 IC The circuit shown here is of a good Stereo FM transmitter that can transmit high quality signals up to a range of 70 feet. The circuit is based on BH1417 PLL stereo transmitter IC from Rhom semiconductors. The IC has separate audio processing sections for the left and right channels, pre emphasis circuit for improving signal to noise ratio, crystal control circuitry for accurate frequency locking, multiplex circuit for making sum ( left plus right) and difference ( left minus right) {see this article for better understanding Stereo decoder circuit} etc. Another important feature of this IC is that the transmission frequency can be set using a 4 channel DIP switch. The IC can be powered from anything between 4 to 6V DC and has an output power around 20mW. At full output power the circuit consumes only 20mA and has a channel separation of 40dB.There are 14 possible preset transmission frequencies, starting from 88.7MHz and incrementing in steps of 0.2MHz that can be selected using the DIP switch. The PLL circuitry of the IC is so precise that there is practically no frequency drift. Circuit diagram. Circuit description. Capacitors C18 and C19... |
| CircuitsToday Launches Forums and Crossed Ten Thousand Subscribers Posted: 19 Jul 2011 05:02 AM PDT Greetings to everyone This is a day of celebration for everyone here at CircuitsToday. Today, we achieved a milestone of 10,000 daily E-mail subscribers. At this joyous moment, we are announcing the launch of our new Forums – Community of Electronics Professionals,Students and Hobbyists. The community portal is divided into different sections with specific purposes as described below: The Electronics Forum: This section is a general type forum to discuss in general about electronics. “The Electronics Forum” features a general section, a forum to discuss circuit design and development, a forum for PCB design and related topics, a forum for Hobby circuits and small projects, a section to discuss in general about Digital and Power electronics. The Advanced Electronics Forum: A place to discuss in detail about advanced electronics like Microprocessor and micro controllers, embedded system design, Digital signal processing, VLSI system design and a forum for Robotics and automation. The Design Tools and Software Forum: A unique forum to discuss about various programming concepts, programming issues, discuss drawing software’s and other types of design software’s. This section also caters Datasheets and Manuals. The Students Forum: An exclusive section for students of electronics, this forum serves students with their various needs like Seminars, Main project... |
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