Radio receiver FM 88 - 108 MHZ. Synchrodyne

[@eugenepohjola258]

Howdy. I would say this is a regular regenerative slope detector. The oscillator requires the antenna energy to oscillate. Tuning the resonance so that the incoming signal is on either side of the resonance curve the incoming signal will pull the oscillator. The oscillator fights back by drawing more current. The variations of current is the detected audio. The R1 should be a 22 k trimmer to trim the oscillator to just under self oscillation for best sensitivity. Best sensitivity is not necessarily the best audio because at best sensitivity the Q is high and the sidebands might not get through. Audio distorsion. The best trimmer setting greatly varies for different stations too. Regards.

[@dz-abouttechnique1849]

Thank you for your comment!

[@ALEFILES]

@@dz-abouttechnique1849 Which transistor is T3? L1 must be winded around a ferrite beam? Thanks a lot for your video! Greetings from Argentina!

[@dz-abouttechnique1849]

@@ALEFILES T3 is 2N3904. L1 coils in the air. Good luck!

[@arnoldjaan]

Very Nice receiver

[@dz-abouttechnique1849]

Thank you! 🙂

[@Євангеліяпросто]

Gut.😊

[@dz-abouttechnique1849]

Thank you! 🙂

[@UpinkProduction]

I love it good 👍

[@dz-abouttechnique1849]

Thank you! 🙂

[@ingussilins6330]

This circuit like a regenerative / direct conversion PLL receiver.

[@dz-abouttechnique1849]

From my research and in specialized literature it is also called - synchrodyna.

[@wolfganghiesmayr8745]

Thanks

[@dz-abouttechnique1849]

I am waiting for the result.🙂

[@wolfganghiesmayr8745]

Can You send a schema ? Great project

[@dz-abouttechnique1849]

You can find the scheme here: minute 0:10 Good luck!

[@samerali3748]

Did you wind the L2 coil on a resistor?

[@dz-abouttechnique1849]

Yes.

[@samerali3748]

Thanks. What is the value of resistance?

[@dz-abouttechnique1849]

@@samerali3748 At least 1 k.

[@dz-abouttechnique1849]

At least 1 k.@@samerali3748

[@walterwinnipeg7350]

This video would be much more useful if you fully explained the circuit. How does it work? What does each component do? How was it designed? Just watching someone soldering a bunch of parts together for 7 minutes is just not that educational. Sorry.

[@dz-abouttechnique1849]

Now you can find the principle of operation. 🙂