Stereo encoder circuit built with MC1496

[STL]

This Stereo encoder circuit built with MC1496.
It produces a very clean signal with good separation
(it performed as well as any other encoder, which 
included some expensive professional ones) and has
been used on many professional commercial radio stations.
There's no input filtering on it so it has to be
proceeded by a 15 kHz low-pass filter (which was
something I put on my processor instead of on the encoder).
 It needs a +/- 8 Volt supply but +/- 9V would work equally
 well and it produces 1 Volt peak-to-peak into a 75 Ohm
load (and a bit more into a high impedance one) with 0dBu
 audio drive. XL1 should be a 4.864 MHz one

The wires and extra PCB (off the top of the shot) in the
picture are for a composite clipper that was added afterwards,
 which provides about another dB and a half of loudness.



http://alectronics.blogspot.com/2010/05/fm-stereo-encoder-this-stereo-encoder.html

or

http://radiofrequencycircuit.blogspot.com/2008/07/fm-stereo-encoder.html


Thank you.

[dee's]

can you explain how this circuit works, because i don't think this circuit really works as a stereo encoder.

[jeckoexxel]

Bikin model Balance Modulator 1496 kaya gini kalo gag punya Oscilosskop.. ya pake ilmu PERASAAN... lebih mudah yg sampling.. btw bagus juga buat tambahan ilmu... keep posting..!

[dee's]

Bikin model Balance Modulator 1496 kaya gini kalo gag punya Oscilosskop.. ya pake ilmu PERASAAN... lebih mudah yg sampling.. btw bagus juga buat tambahan ilmu... keep posting..!

baru denger tuh bikin stereo encoder pake perasaaan, paranormal kali yak.... 

[Kang Paimo]

Skema tersebut sebetulnya stereo encoder analaog . MC 1496 berfungsi sebagai balanced modulator dengan input sinyal subcarrier 38khz . Audio L dan R masuk ke input balance pada kaki 4 dan kaki 1 dari MC1496. Output dari MC1496 adalah sinyal DSBSC(double side band suppressed carrier) pada frekuensi 38khz dengan komponen audio (L-R) , yang dikuatkan oleh IC3A.
Sinyal 38khz berasal dari kaki 6 IC 4060 (Q7) , setelah masuk rangkaian low pass filter lalu dikuatkan oleh IC 3b , baru kemudian ke kaki 10 dari MC1496.
Sinyal pilot 19khz dihasilkan dari kaki no 14 (Q8) dari ic 4060  ,masuk rangkaian lowpass filter lalu dikuatkan oleh ic 4A(NE5532) , pengatur phase VC1 (trimmer 65pF).
Audio ( L+R ) didapat dari rangkaian resistor R34 dan R33 .
IC4B + TR1 + TR2 berfungsi sebagai penguat sinyal multiplex , outputnya lewat R39.

[Kang Paimo]

Link ini juga membahas Stereo Encoder analog :

http://ludens.cl/Electron/fmtx/fmtx.html