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Old 9th Nov 2017, 3:42 pm   #1
Neil Purling
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Default Haynes Advent Calendar Radio

If there have been previous threads on the Haynes Advent Calendar FM Radio kit can someone point me in the right direction.
I have tried a search of course but only got a mention of them when a member had a grand-daughter who had shown an interest in what grandpa was doing.
Is there a extensive thread on the construction & modification of these radios?


I have seen them in my local Maplin's branch at 20 and on Amazon at around 15.
There seem to be two distinct varieties, unless this is just packaging differences.
One has a front illustration with a horizontal dial, the other has one with a vertical dial.
These have been around since last year as member 60 oldjohn showed me one on his workbench made on a prototype board. This is what you get with the kit apparently .
There may also be an included LM386 amplifier IC.
The actual radio IC is on a postage stamp sized PCB. Tuning is by two tiny push buttons.
I don't know abouut volume control.
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Old 9th Nov 2017, 4:19 pm   #2
paulsherwin
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Default Re: Haynes Advent Calendar Radio

http://www.vintage-radio.net/forum/s...d.php?t=131649
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Old 9th Nov 2017, 5:37 pm   #3
Neil Purling
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Default Re: Haynes Advent Calendar Radio

Those Forum Members who bought these kits last year & assembled the radio..
How many of you still have the thing assembled & working?
I just wondered if the packaging with the kit can be made into a basic enclosure for the prototype board.
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Old 9th Nov 2017, 7:41 pm   #4
kalee20
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Default Re: Haynes Advent Calendar Radio

You could make up the enclosure by folding, but it's only cardboard.

The proto board has limitations. It does not hold the switches securely, they jump out without much provocation.

Do I have it assembled? Yes. Do I have it working? No, largely because of the above.

Was its fun? Yes. Was it value for money? Yes. Could it have been better? Yes, but probably far less cost-effectively, and a higher price tag would likely have killed sales.

Whoever put together the kit, they've used standard parts, some custom printing for the booklet and the packaging (and the enclosure). For the price of a meal for one out, or a few beers, you can have a fortnight of fun. Even if you put the whole lot in the bin afterwards, that's not bad! But if you do bin it, you'll keep the proto board... Oh and the speaker, and the LED... And that audio amp IC... And that FM receiver chip is good for another project...

Go on Neil, you know you want one!
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Old 9th Nov 2017, 7:54 pm   #5
60 oldjohn
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Default Re: Haynes Advent Calendar Radio

Hi Neil, The 2 ICs are MC34119 18p each min order 10 and BK1068 0.8$ each min order 10,000! post free. Yes I have my set, not tried it lately. Both Vol and Stations are set with buttons.


John.
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Old 9th Nov 2017, 8:40 pm   #6
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Default Re: Haynes Advent Calendar Radio

Radiocruncher assembled one on his excellent Youtube channel
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Old 10th Nov 2017, 12:39 pm   #7
Neil Purling
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Default Re: Haynes Advent Calendar Radio

I have a proto board & a box of jumpers I could make the kit on. It may have better grip.
Fingers start to itch...........
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Old 10th Nov 2017, 7:41 pm   #8
Jonster
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Default Re: Haynes Advent Calendar Radio

I toyed with the idea of re-assembling mine onto stripboard to make it more 'permanent' and then use the breadboard for something else. When I get the time...
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Old 10th Nov 2017, 8:37 pm   #9
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Default Re: Haynes Advent Calendar Radio

The MC34119 could easily be replaced with an LM386 or similar audio chip, but the scanning FM chip may be harder to substitute.

The kit is a harmless enough bit of fun for both adults and children, and although not dirt cheap doesn't cost a fortune.
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Old 11th Nov 2017, 8:12 am   #10
Neil Purling
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Default Re: Haynes Advent Calendar Radio

The scanning IC is identical to a Beken BK1079, which is a ten pin 1mm pitch surface mount device.
the reduction to eight pins on the breakout board may be due to removal of a 32.768 crystal clock option and maybe to restrict the tuning range. There is one tiny component on that fragment of PCB. What it is I do not know. I know the BK1079 tunes 76-108Mhz. I know I could not solder wires to that SMD chip unless I had a very big lens
You can buy the BK1068 breakout board for nine euros from a German site. The BK1079 chip is thirty two pounds for a bag of fifty ICs. The MC34119 is dirt cheap, one pound nineteen for ten. Socket mount. The good thing about that chip is the lack of extra components needed to form a amplifier.
I was just trying to see if I could possibly buy the parts for less than the Haynes kit.
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Old 11th Nov 2017, 6:55 pm   #11
Neil Purling
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Default Re: Haynes Advent Calendar Radio

Quote:
Originally Posted by kalee20 View Post
Go on Neil, you know you want one!
Enough arm twisting...
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Old 12th Nov 2017, 11:19 am   #12
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Default Re: Haynes Advent Calendar Radio

Quote:
Originally Posted by nebogipfel View Post
Radiocruncher assembled one on his excellent Youtube channel
Thanks John. The link to the series I made is here https://www.youtube.com/playlist?lis...TtDrX1dRjmk5OH

Mine is still working. I did cut the box out and carefully folded it. I couldn’t see a way of fitting the radio into it though. I was going to fit it all on strip board but haven’t got around to it yet. It was great fun to make and it’s a shame that I don’t have another similar project for this Christmas. If they are still available then definitely get one.

All the best

Graham
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Old 12th Nov 2017, 1:29 pm   #13
TonyDuell
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Default Re: Haynes Advent Calendar Radio

As I mentioned a couple of weeks back, Debenhams (at least the one in Eltham) has the FM Radio advent calendars, and a similar one, also by Haynes to make electronic games (pre-programmed microcontroller, breadboard, LEDs, pushswitches, resistors and capacitors, piezo buzzer).
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Old 12th Nov 2017, 10:47 pm   #14
Neil Purling
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Default Re: Haynes Advent Calendar Radio

Radiocruncher made a mistake in the wiring & so did I. It is quite difficult if you are not looking directly down on the prototype board.
I wondered about a version on stripboard, or perforated board. The radio could have been a very cheap project if the Beken IC was offered in a standard 2.5mm pitch package. If I had a prototype board on which you could fit a front panel I would have a row of switches there. The tiny things you get are so small they are fiddly to fit & don't really want to stay fixed down.
I wondered about feeding the audio to a PAM8403 panel & running that thing off a USB power bank.

It is a fun project, but you can buy a panel from aliexpress which has a LCD display & RDS for 7 UKP or thereabouts.

BTW: The IC had a option for a 32.768Khz crystal. What would that have enabled if it works without?

Last edited by Neil Purling; 12th Nov 2017 at 10:54 pm.
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Old 12th Nov 2017, 11:10 pm   #15
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Default Re: Haynes Advent Calendar Radio

That's a standard clock crystal frequency, so presumably a radio alarm clock.
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Old 14th Nov 2017, 4:02 pm   #16
Neil Purling
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Default Re: Haynes Advent Calendar Radio

Has anyone made one on a conventional perforated board with a BK1079, or is it too fine pitch to solder wires onto the pins?
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Old 14th Nov 2017, 11:53 pm   #17
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Default Re: Haynes Advent Calendar Radio

1mm isn't too bad for 30AWG wirewrap wire connections. 0.625mm is a real pain though. (Had to do a few design mods at that level once- ARRRghh).
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Old 15th Nov 2017, 4:48 pm   #18
Neil Purling
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Default Re: Haynes Advent Calendar Radio

You can get adapter boards that would be much like the supplied IC. It is just that if you wanted to make another getting the Beken BK1079 IC means buying a bag of fifty. Be worth it if there was three or four people to divide up a purchase of adapter boards & ICs.
If it could be modified to run from 5V provided by a power bank you could use one of those 99p PAM 8403 Class D amplifier boards for 99P. Unless the MC34119 has more gain....
I haven't got so far as to add that extra IC yet.
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