MK 484 Radio - Tuning Capacitor Value?
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Posted by Dave.H on May 24, 2008, 5:15 am
Please log in for more thread options MK 484 IC. The site doesn't seem to say what variable capacitor value to use, I happen to have a fairly new 365 pF unit lying around, that I could use. I would also want to know if any type of ferrite coil would work, or would it be better to wind my own? Thanks, Dave Australia | |||||||||||||
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Posted by Don Bowey on May 24, 2008, 12:03 pm
Please log in for more thread options f0c62a65-5604-4e8e-b0b3-2c54f0b6947d@x1g2000prh.googlegroups.com, "Dave.H" The component values depend on what frequency band you wish to tune. Here's a link that may help you. http://www.rapidonline.com/resources/docs/82-1026.pdf Note that the MK484 IC is rated only to 3 MHz. | |||||||||||||
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Posted by Dave.H on May 24, 2008, 12:14 pm
Please log in for more thread options > On 5/24/08 2:15 AM, in article
> f0c62a65-5604-4e8e-b0b3-2c54f0b69...@x1g2000prh.googlegroups.com, "Dave.H" > > > I found a website that has construction details for a radio using the
> > MK 484 IC. The site doesn't seem to say what variable capacitor value > > to use, I happen to have a fairly new 365 pF unit lying around, that I > > could use. I would also want to know if any type of ferrite coil > > would work, or would it be better to wind my own? >
> > Thanks, Dave
> > Australia >
> The component values depend on what frequency band you wish to tune. > > Here's a link that may help you. > > http://www.rapidonline.com/resources/docs/82-1026.pdf > > Note that the MK484 IC is rated only to 3 MHz. I want to tune the AM band 530 kHz too at least 1500 kHz. There's not too many AM stations in the high end of the band, (highest one is at 1431 kHz, the one I usually listen to) so I'm not worried about the radio tuning any higher than 1500 kHz | |||||||||||||
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Posted by ian field on May 24, 2008, 1:21 pm
Please log in for more thread options
>> On 5/24/08 2:15 AM, in article
>> f0c62a65-5604-4e8e-b0b3-2c54f0b69...@x1g2000prh.googlegroups.com, >> "Dave.H" >> >> > I found a website that has construction details for a radio using the
>> > MK 484 IC. The site doesn't seem to say what variable capacitor value >> > to use, I happen to have a fairly new 365 pF unit lying around, that I >> > could use. I would also want to know if any type of ferrite coil >> > would work, or would it be better to wind my own? >>
>> > Thanks, Dave
>> > Australia >>
>> The component values depend on what frequency band you wish to tune. >> >> Here's a link that may help you. >> >> http://www.rapidonline.com/resources/docs/82-1026.pdf >> >> Note that the MK484 IC is rated only to 3 MHz. >
> I want to tune the AM band 530 kHz too at least 1500 kHz. There's not > too many AM stations in the high end of the band, (highest one is at > 1431 kHz, the one I usually listen to) so I'm not worried about the > radio tuning any higher than 1500 kHz Pinch the tuning cap and ferrite rod out of an old transistor radio. | |||||||||||||
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Posted by Don Bowey on May 24, 2008, 2:33 pm
Please log in for more thread options On 5/24/08 9:14 AM, in article
059b3129-7594-4053-9dcb-77abc768b5bf@q24g2000prf.googlegroups.com, "Dave.H" >> On 5/24/08 2:15 AM, in article
>> f0c62a65-5604-4e8e-b0b3-2c54f0b69...@x1g2000prh.googlegroups.com, "Dave.H" >> >>> I found a website that has construction details for a radio using the
>>> MK 484 IC. The site doesn't seem to say what variable capacitor value >>> to use, I happen to have a fairly new 365 pF unit lying around, that I >>> could use. I would also want to know if any type of ferrite coil >>> would work, or would it be better to wind my own? >>
>>> Thanks, Dave
>>> Australia >>
>> The component values depend on what frequency band you wish to tune. >> >> Here's a link that may help you. >> >> http://www.rapidonline.com/resources/docs/82-1026.pdf >> >> Note that the MK484 IC is rated only to 3 MHz. >
> I want to tune the AM band 530 kHz too at least 1500 kHz. There's not > too many AM stations in the high end of the band, (highest one is at > 1431 kHz, the one I usually listen to) so I'm not worried about the > radio tuning any higher than 1500 kHz You could use the ferrite coil from a junk AM radio, or wind the one shown in the link. The author of the publication used a 120pF cap, but your 365pF cap will do fine; the lowest frequency will be achieved with the plates about 1/2 meshed unless you use fewer turns. If you wind the coil on a ferrite rod, I suggest you tap it every 10 turns and experiment. Don | |||||||||||||
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> MK 484 IC. The site doesn't seem to say what variable capacitor value
> to use, I happen to have a fairly new 365 pF unit lying around, that I
> could use. I would also want to know if any type of ferrite coil
> would work, or would it be better to wind my own?
>
> Thanks, Dave
> Australia