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Old 14th March 2008, 12:47 AM   #1
tadiam is offline tadiam  Argentina
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Default i want build an fm tuner

I have an fm tuner head sinto (agc,caf,fi) y want the asociate circuit fi+10,7mhz+audio out.
Any sugestion
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Old 14th March 2008, 01:11 AM   #2
TheMG is offline TheMG  Canada
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You'll have to rephrase that, cause I honestly have absolutely no clue what you're asking, sorry.
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Old 14th March 2008, 08:25 AM   #3
Elvee is offline Elvee  Belgium
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Have a look at application notes of specialized ICs, like this one f.e.:
http://lab.binus.ac.id/pk/databook/audio/CA3189.pdf
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Old 14th March 2008, 02:05 PM   #4
tadiam is offline tadiam  Argentina
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Default re

thanks for the date
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Old 14th March 2008, 02:46 PM   #5
KP11520 is offline KP11520  United States
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Buy yourself a book by John Linsley Hood about Tuner design.

He is considered to be one of the top guys and he explains well.

Good luck.

Regards//Keith
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Old 14th March 2008, 02:54 PM   #6
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Is it worth?!
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Old 14th March 2008, 03:02 PM   #7
jaycee is offline jaycee  United Kingdom
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The problem is that these days, none of the chips that were used in such books or kits exist - and the modern chips that do exist are highly integrated, surface mount parts that need a microcontroller to control them.
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Old 14th March 2008, 03:24 PM   #8
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if you want to build a FM tuner it is much easier to get all the mechanicals down first -- you can purchase a used tuner on EBay (Pioneer, Technics, Onyko, Sansui, Dynaco etc., etc.) and even ship it to Europe for less than it would cost to buy the variable caps (assuming you aren't going to use diodes), power supply, dial assembly etc.

There are a lot of great preamplifier circuits on the ham radio websites, even assembled preamps with much lower noise than conceivable a couple decades ago. Take something from the 2 meter ham bands (144MHz) and reconfigure it for 88 - 108 MHz.

(I still have kicking around a pair of preamps with 6CW4 nuvistor tubes.)
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Old 14th March 2008, 04:27 PM   #9
KP11520 is offline KP11520  United States
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Jack,

Are you (still) involved with Ham Radio?

Seems like it is dying out (unfortunately) with younger generations texting and using all the other gizmos.


jaycee,

Do you think the theory and explanations are outdated too? That would be a shame for the work of such a bright guy.

I hate when that happens!

Regards//Keith
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Old 14th March 2008, 04:29 PM   #10
jaycee is offline jaycee  United Kingdom
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Quote:
Originally posted by KP11520
Jjaycee,

Do you think the theory and explanations are outdated too? That would be a shame for the work of such a bright guy.
I guess the problem comes when people are shown how to use IC's but not taught the "magic tricks" that go on inside the little black boxes. Younger people like myself also tend to disregard anything using tubes as "archaic" even though the principles may well be unchanged!

I'll freely admit to relying on the "black boxes of tricks" far too often :/
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