- All band receiver radio circuit serial#
- All band receiver radio circuit software#
- All band receiver radio circuit code#
The diagram below shows what was implemented. The chip that I used is still available from at least one distributor at the time of writing, as well as from ebay/aliexpress. If the chip I used (TEF6606) is not obtainable, then TEF6601, TEF6607, TEF6614, TEF6616, TEF6617, TEF6621, TEF6623 or TEF6624 could be used (but check the datasheets to see if they support the features you want!). Other differences include the adjacent channel filtering method and low-FM band capability (used in some European countries). NXP has around half a dozen pin-compatible chips in the range, with some feature differences in particular, not all of them support the SW band. Farnell had a decent amount of stock several weeks ago, but someone took them all : ( However, there are pin-compatible alternatives. The particular chip used is obsolete, but still available from suppliers. All modern radio chips are in much smaller packages, optimised for very high frequency communication or processing. This project may be using amongst the last of the highly-integrated radio chips that are easily hand-solderable (it is in a large SOIC-32 package). Many IoT radio modules use Low IF too So, this project isn’t using cutting edge SDR, but has a blend of analog and digital, and for learning purposes different parts of the design could be probed to explore how these receivers work.
All band receiver radio circuit software#
This project implements a ‘Low Intermediate Frequency (Low IF)’ architecture that gained popularity in the last couple of decades, but has now been succeeded by software defined radios (SDR) in many consumer products, although plenty of home and car radio designs being sold today still use Low IF. At one time it was common for radios to require many adjustable inductors and transformers, but those types of components have disappeared because modern radio architectures do not require them. Some of the older analog radio projects in books are no longer feasible due to components being obsolete. Most radio receivers have a mix of analog and digital technology.
All band receiver radio circuit code#
The source code and schematics are attached, as are the PCB files for sending to a manufacturer, if anyone wishes to replicate this project.
This blog post covers the design and how it was tested. For the display I used an earlier LCD digit display project, but this could be replaced with other LED or LCD displays with some code modifications.
All band receiver radio circuit serial#
Any microcontroller board, display and buttons or rotary encoders could be used to operate it.įor now, to test the board, I temporarily connected an Arduino MKR ZERO board and wrote software that accepts keyboard inputs from a PC via the USB serial (UART) interface, to control all the board features. This project is surface-mount, but all the parts are large and hand-solderable.Įventually I’d like to build a wooden enclosure and fit a couple of speakers with amplifier and headphone socket for a fully-integrated home radio. The PlanetCatcher circuit board can connect to any microcontroller using a 3.3V I2C bus, and it outputs stereo audio, usable with headphones or ready for connection to an amplifier. There are lots of opportunities to improve the performance further. In short wave (SW) mode, in a single evening, the board managed to pick up broadcasts from thousands of miles away with just a few meters of random wire as an antenna. In terms of performance, with just a listening test, FM sounds acceptable – not super-hi-fi, but as good as a typical car stereo. There is a 4-minute video explaining the project here: It is an easy-to-build project (no tiny parts) and cut-down versions of this project are also possible by selectively populating components, depending on what features are required. All of these building-blocks are present on the board or discussed in this blog post. This project could be (I hope) interesting for anyone wishing to play with analog circuitry such as amplifiers, filters, transformers, audio and RF, but also digital control, software and perhaps digital signal processing as a follow-on project. This blog post describes a radio receiver board called the PlanetCatcher Model 1! I’ve always been fascinated by radio technology, so this month’s Project14 sounded like an opportunity I wanted to try.
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