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FM Radio Kit V2.0

12
Exclusive to Kitronik
Teaching Notes
Key Stage 4
The FM Radio has controls for tuning and to adjust the volume. Includes an audio amplifier and output is via a 66mm speaker. Powered by batteries or mains.

Availability: In Stock.

Code1+ 5+ 50+
2157£12.00
(£14.40 incl VAT)
£10.50
(£12.60 incl VAT)
£9.50
(£11.40 incl VAT)
OR

The FM radio kit uses industrial surface mount ICs (the Si4820 and the NCP2890). The FM radio kit is supplied with the ICs mounted on the board. You just have to solder the remaining resistors,capacitors and other components to finish the kit.

The radio has controls for tuning and to adjust the volume. The circuit includes an audio amplifier and output is via a 66mm diameter speaker that is supplied with the kit.

The board can be powered from a 2.5V to 5.5V supply and works nicely off a 5V wall supply or 3x AA batteries (not supplied).

The Si4820 IC is one of the latest generation of radio receiver ICs that offer fantastic reception quality and ease of tuning, and the NCP2890 IC can output 1W of power.

Features:

  • FM Radio kit.
  • Audio amplifier built-in.

Contents:

Dimensions:

  • PCB Length: 88mm.
  • PCB Width: 46mm.

Requires:

Resources:

Buy British:

 This kit is designed and manufactured in the UK by Kitronik.


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Questions:

Posted by Jack, Monday, 6 November 2017 on product FM Radio Kit V2.0
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    vote
    A: Hi Jack, In theory it should be possible, you would need to connect the 3.5mm jack lead you to a switch which is then used to change what input you are using. The switch would then need to be connected up between the FM radio IC and the amplifier IC. However we haven’t done this ourselves so we are unsure what feedback and interference you would have.
    Posted by Michael Lockhart on Tuesday, 13 June 2017
Posted by Luke, Friday, 6 January 2017 on product FM Radio Kit V2.0
  • 0
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    A:

    Hi Luke, The FM radio kits can run on a voltage between 2.5-5.5V with a maximum current draw of 250mA. A USB plug power supply such as this one, https://www.kitronik.co.uk/2261-usb-power-supply-uk-mains.html can provide 5V and a maximum current draw of 500mA. So yes it should be fine.

    Posted by Michael Lockhart on Friday, 6 January 2017
Posted by Maisie Kenny, Thursday, 17 November 2016 on product FM Radio Kit V2.0
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    vote
    A:

    Hi Maisie, Yes it is possible to add a second speaker to the circuit. The kit is supplied with an 8 Ohm speaker, and is best suited for an impedance of 8 Ohm’s. As such you best option is to either have 2x 16 Ohm speakers and put them in parallel this would give a total impedance of 8 Ohms, or have 2x 4 Ohm speakers in series you would have a total impedance of 8 Ohms.

    Posted by Michael Lockhart on Thursday, 17 November 2016
Posted by Marcus0444, Wednesday, 6 April 2016 on product FM Radio Kit V2.0
  • 0
    vote
    A:

    Tune 1, Tune 2 and band are used to select the frequency of the radio signals that can be received. There are details on the difference frequency’s that can be received and how to obtain this on page 2 of the following document, http://www.silabs.com/Support%20Documents/TechnicalDocs/AN555.pdf We have set the kit up to receive signals in band 2. 

    Posted by Michael Lockhart on Wednesday, 6 April 2016
Posted by circuit, Thursday, 3 March 2016 on product FM Radio Kit V2.0
Posted by Headphone, Thursday, 3 March 2016 on product FM Radio Kit V2.0
  • 0
    vote
    A:

    No you wouldn’t be able to put a jack plug on the radio kit. If you wanted to have the option of either an audio input cable or an FM input then you would need to connect these up to the high powered amp kit.

    Posted by Michael Lockhart on Thursday, 3 March 2016
Posted by Marc-Anthony Marquis, Friday, 26 February 2016 on product FM Radio Kit V2.0
  • 0
    vote
    A:

    Do you mean are the components compactable with the PCB? All the components will fit onto the PCB as detailed in the built instruction.

    Posted by Michael Lockhart on Friday, 26 February 2016
Posted by Karl Fisher, Tuesday, 23 February 2016 on product FM Radio Kit V2.0
  • 0
    vote
    A:

    Unfortunately the amplifier chip that is used on the new FM radio kit has a maximum voltage rating of 6V, as such you wouldn’t be able to run the new version off a 9V power supply. The only option would be to use a 9V power supply for your other circuit and then use a voltage regulator to step this down to the 5V for the FM radio kit. You would be fine using this regulator, https://www.kitronik.co.uk/2906-l7805-5v-reg-ic.html you would need to connect it up as per the diagram on page 4 https://www.kitronik.co.uk/pdf/7805.pdf

    Posted by Michael Lockhart on Tuesday, 23 February 2016
  • 0
    vote
    A:

    Unfortunately the amplifier chip that is used on the new FM radio kit has a maximum voltage rating of 6V, as such you wouldn’t be able to run the new version off a 9V power supply. The only option would be to use a 9V power supply for your other circuit and then use a voltage regulator to step this down to the 5V for the FM radio kit. You would be fine using this regulator, https://www.kitronik.co.uk/2906-l7805-5v-reg-ic.html you would need to connect it up as per the diagram on page 4 https://www.kitronik.co.uk/pdf/7805.pdf

    Posted by Michael Lockhart on Tuesday, 23 February 2016
  • 0
    vote
    A:

    Unfortunately the amplifier chip that is used on the new FM radio kit has a maximum voltage rating of 6V, as such you wouldn’t be able to run the new version off a 9V power supply. The only option would be to use a 9V power supply for your other circuit and then use a voltage regulator to step this down to the 5V for the FM radio kit. You would be fine using this regulator, https://www.kitronik.co.uk/2906-l7805-5v-reg-ic.html you would need to connect it up as per the diagram on page 4 https://www.kitronik.co.uk/pdf/7805.pdf

    Posted by Michael Lockhart on Tuesday, 23 February 2016
Posted by Karl Fisher, Monday, 18 January 2016 on product FM Radio Kit V2.0
  • 0
    vote
    A:

    Unfortunately this kit isn’t available in a pre-built kit form.

    Posted by Michael Lockhart on Monday, 18 January 2016
Posted by Nathan, Wednesday, 17 June 2015 on product FM Radio Kit V2.0
  • 0
    vote
    A:

    It is possible to add a second 8 Ohm speaker in this kit, however the speaker needs to be connect in parallel with the first speaker.

    Posted by Michael Lockhart on Wednesday, 17 June 2015
Posted by Jez Siddons, Friday, 22 May 2015 on product FM Radio Kit V2.0
  • 0
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    A:

    The 1m of wire is intended for the antenna and for the speakers, we recommend using a piece of wire with a length of around 56cm. The off cut from this is then used to connect the speaker. As for a telescopic antenna we now stock a compatible antenna for the version 2 FM radio, https://www.kitronik.co.uk/2006-fm-radio-telescopic-antenna-aerial.html 

    Posted by Michael Lockhart on Friday, 22 May 2015
Posted by Oliver Ashton, Tuesday, 4 November 2014 on product FM Radio Kit V2.0
  • 0
    vote
    A: You could power it from a 5V wall supply instead of using batteries. You wouldn't want to try to power it from both at the same time though.
    Posted by Aaron Sturman on Tuesday, 4 November 2014
Posted by Terry, Friday, 10 October 2014 on product FM Radio Kit V2.0
  • 0
    vote
    A: There is no reason why you can't do this, though it isn't something we have tried. The audio out of the radio IC is a lot lower than a line signal, so you would need to use the on board amplifier as a pre-amp to get the output to about 1V. Follow the assembly instructions except don't add the speaker. Instead connect the audio connector signal wire to one of the speaker connections, it wants to be the speaker connection pin next to the speaker text. Then connect the ground on the audio connector to the negative power connection on the board. Set the volume fairly low and your ready to give it a try.
    Posted by Geoff Hampson on Friday, 10 October 2014
Posted by Wade, Thursday, 2 October 2014 on product FM Radio Kit V2.0
  • 0
    vote
    A: Hi, it is but it requires a couple of small changes when building the FM Radio kit that are hard to describe without sending pictures. If you email me at support@kitronik.co.uk I can send you some information on how to do it. Basically though all you have to do is common the grounds, disconnect the FM radio's onboard amplifier and reroute the audio signal to the inputs on the high power amp.
    Posted by Aaron Sturman on Thursday, 2 October 2014
Posted by David Searle, Wednesday, 1 October 2014 on product FM Radio Kit V2.0
  • 0
    vote
    A: It would take a few additional components and a different PCB layout to accommodate them. It's also unlikely to be possible with a single sided PCB using through-hole components. The price would probably end up considerably higher. We wanted to keep our replacement radio kit price as close to the old radio kit as possible so we opted not to include AM or SW features.
    Posted by Aaron Sturman on Wednesday, 1 October 2014
Posted by Andrew, on product FM Radio Kit V2.0
  • 0
    vote
    A: Hi Andrew, Unfortunately the IC doesn’t allow for a visual display of the frequency to be outputted. As such it is not possible to see the frequency that the radio is tuned to.
    Posted by Michael Lockhart on Wednesday, 27 September 2017
Posted by simon cox, on product FM Radio Kit V2.0
  • 0
    vote
    A: Hi Simon, On the previous version there was a pin on the IC which allowed for the mute to be bypassed, however on the new IC there isn’t a pin which allows for the mute to be bypassed. With regards to the potentiometer if you are referring to a multi turn potentiometer and it if the correct value then yes this should be possible. It should also make tuning easier as it would be less sensitive.
    Posted by Michael Lockhart on Tuesday, 24 October 2017

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Physical characteristics:

  • PCB Length: 88mm.
  • PCB Width: 46mm.
  • PCB Component Count: 36.

Electrical characteristics:

  • Voltage Nominal: 5V.
  • Voltage Range: 2.5V - 5.5V.
  • Voltage Absolute Max: 6V.
  • Typical Standby Current: 20mA.
  • Current Maximum at Nominal Voltage: 250mA.
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