Hello, can somebody help me with an240P

[(*steve*)]

Here are two other options.

The first used a TDA7000, is simple, and the chip is still easily available.



The second is a more discrete version, but the explanation that goes along with it may be more useful

 

[michael1978]

You want to make an FM radio from a frying pan?

Can you explain more clearly? I understand that English may not be your preferred language, but we really need to come to a common understanding.

Like i say, i have proble

I helped you by posting a link to an AM-FM superhet radio kit that comes with a university course about how it works. Now in this thread you are asking for help with an old Japanese part of a TV sound system.

Is TRUE, but i dont know so much IC, almost nothing , but what i know what he gave me, But i did not understand that he gave me for TV sound, when my question was simply....

 

[michael1978]

Here are two other options.

The first used a TDA7000, is simple, and the chip is still easily available.

View attachment 41241 View attachment 41242 View attachment 41243

The second is a more discrete version, but the explanation that goes along with it may be more useful

View attachment 41244 View attachment 41245 View attachment 41246 View attachment 41247

Thank you, i have TDA7000 IC but where did you get this info...about TDA7000, can you show me link to download complete.



i have problem for FM how to make a coils and transformer.

 

[(*steve*)]

Thank you, i have TDA7000 IC but where did you get this info

They are copies of article from a magazine. You can see the details at the bottom of the pages.

...about TDA7000, can you show me link to download complete.

LMGTFY

i have problem for FM how to make a coils and transformer.

The first article has information about the coil former and how to wind the coil. You can do it yourself.

 

[kellys_eye]

You really think you can manage a project of this complexity?

Your posts (so far) don't indicate the level of expertise and/or knowledge required to construct such a device.

Build something less complicated to begin with - learn some of the principles and theories etc. What is the most complicated item you've built so far?

 

[michael1978]

They are copies of article from a magazine. You can see the details at the bottom of the pages.



LMGTFY



The first article has information about the coil former and how to wind the coil. You can do it yourself.

I see in page 19 AND 20, now, but what do you think to make transformer for fm receiver is difficult? i now they need primar and secondary, step up voltage and step down voltage i read in internet, i make just loopstic ferrit antenna
i know that, but for fm i dont know? is big of small, how to make it?

 

[(*steve*)]

is big of small, how to make it?

Read the article. It tells you *exactly*.

 

[michael1978]

Read the article. It tells you *exactly*.

Steve tnhx for time, but i understand so good,
i wil like just one more question, can you please tell me how to make a "fm discriminator" for am is easy is diode, but for fm i search on internet but i dont find nothing to explain of the value of component of how work circuit,, if you know is possible if you have time to explain me? thnx

 

[duke37]

There are many ways of detecting FM signals. Look up "Wikipedeia, detectors (radio)"

Detectors with dicrete components seem to have moved towards the ratio detector. Integrated circuits may be different to reduce the number of components. At one time I had a TV with a special valve (tube) which converted the FM to PWM.
It can all be mind blowing.

 

[(*steve*)]

if you know is possible if you have time to explain me?

Read the second article I posted.

 

[michael1978]

There are many ways of detecting FM signals. Look up "Wikipedeia, detectors (radio)"

Detectors with dicrete components seem to have moved towards the ratio detector. Integrated circuits may be different to reduce the number of components. At one time I had a TV with a special valve (tube) which converted the FM to PWM.
It can all be mind blowing.

Hi Duke i know how its works RATIO DETECTOR or SLOPE DETECTOR, i search it in google, but the problem i did not find how to conifgure , i did not see any configuration, only how they work.

 

[michael1978]

Hi Man thank you very much, it was very cool explnation, i did not read all, because i was think in, you can do nothning with 6 page, but i read is cool man it shows everything, i just dont undertsand su moch the seconadry and primary detector, what is his value can you tell me please, for the rest cool everything i understand it have value to read such a articul. ;-)

 

[Audioguru]

An AM radio signal changes the amplitude of the carrier frequency (around 1MHz for an AM broadcast station) with the amplitude and frequency of modulation sounds.
An FM signal changes the frequency of the carrier (around 100MHz for an FM broadcast station) with the amplitude and frequency of modulation sounds.
Both normal radios are tuned to the center of a radio channel.
But a simple regenerative receiver has an AM detector that detects amplitude changes in the carrier. When the AM receiver is tuned to one side of an FM channel then when the carrier sweeps the radio frequency toward the side the radio is tuned to the amplitude increases because of the "slope" of the tuned circuit and when the carrier sweeps the radio frequency away from the side the radio is tuned to the amplitude decreases. Then the AM detector does the slope detection of FM. The slope is not very linear so distortion is produced.

 

[michael1978]

An AM radio signal changes the amplitude of the carrier frequency (around 1MHz for an AM broadcast station) with the amplitude and frequency of modulation sounds.
An FM signal changes the frequency of the carrier (around 100MHz for an FM broadcast station) with the amplitude and frequency of modulation sounds.
Both normal radios are tuned to the center of a radio channel.
But a simple regenerative receiver has an AM detector that detects amplitude changes in the carrier. When the AM receiver is tuned to one side of an FM channel then when the carrier sweeps the radio frequency toward the side the radio is tuned to the amplitude increases because of the "slope" of the tuned circuit and when the carrier sweeps the radio frequency away from the side the radio is tuned to the amplitude decreases. Then the AM detector does the slope detection of FM. The slope is not very linear so distortion is produced.

Thnx Audio Guru, you master but i was reading the article, where to F29 do you have any idea? goodnight

 

[michael1978]

I read again, for T2 and T3 the say the turns, but for T1 and T4v they say something F29, i search on internet to buy, but i dont understand this. what is F29 ic transformer? if yes where can i buy. goodnight

 

[michael1978]

An AM radio signal changes the amplitude of the carrier frequency (around 1MHz for an AM broadcast station) with the amplitude and frequency of modulation sounds.
An FM signal changes the frequency of the carrier (around 100MHz for an FM broadcast station) with the amplitude and frequency of modulation sounds.
Both normal radios are tuned to the center of a radio channel.
But a simple regenerative receiver has an AM detector that detects amplitude changes in the carrier. When the AM receiver is tuned to one side of an FM channel then when the carrier sweeps the radio frequency toward the side the radio is tuned to the amplitude increases because of the "slope" of the tuned circuit and when the carrier sweeps the radio frequency away from the side the radio is tuned to the amplitude decreases. Then the AM detector does the slope detection of FM. The slope is not very linear so distortion is produced.

Sorry AudioGuru, i see in google i see how they work, but they dont tell the components value..........

 

[michael1978]

Read the second article I posted.

i read it, articule 3, i found F29 is ferrit slug, but where can i find to buy, secont this winding also is the same number of turns you use for T1 and T2 like in article 3 first party

 

[Audioguru]

The article about making your own FM radio was printed 25 years ago when only a few people made radios themselves. Where can you buy F29 ferrite cores for radio transformers today? Maybe in a radio kit.

Buy a radio, take it apart and use its parts to make your own radio.

 

[michael1978]

The article about making your own FM radio was printed 25 years ago when only a few people made radios themselves. Where can you buy F29 ferrite cores for radio transformers today? Maybe in a radio kit.

Buy a radio, take it apart and use its parts to make your own radio.

GoodMorning, have a good sleep ;-) you cant find, are you sure?

 

[(*steve*)]

Googling for "F29 ferrite slug" produces a result which indicates where you can get one.

I wish you and @Audioguru knew about Google. It's a great resource.

From the looks of it, the slug is 6mm in length.

The former may be harder to find, but a cylinder of paper and some wax may work fine. I'd ask the supplier of the slug what they have.