i want build an fm tuner

[tadiam]

I have an fm tuner head sinto (agc,caf,fi) y want the asociate circuit fi+10,7mhz+audio out.
Any sugestion

[TheMG]

You'll have to rephrase that, cause I honestly have absolutely no clue what you're asking, sorry.

[Elvee]

Have a look at application notes of specialized ICs, like this one f.e.:
http://lab.binus.ac.id/pk/databook/audio/CA3189.pdf

[tadiam]

thanks for the date

[KP11520]

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

[Andy L. Francis]

Is it worth?!

[jaycee]

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.

[jackinnj]

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.)

[KP11520]

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Do you think the theory and explanations are outdated too?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

[jaycee]

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Do you think the theory and explanations are outdated too?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 :/