433MHz schematic.

Thread Starter

nerdegutta

Joined Dec 15, 2009
2,684
Good evening.

Not too long ago I saw the schematic for this:


... or equal.

It was on AAC, and I think it was Bertus who posted the schematic.
Have anyone seen it, or know where it has gone.

Thanks.
 

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bertus

Joined Apr 5, 2008
22,270
Hello,

The shown transmitter uses a saw filter as frequency reference.
The transistor must be a UHF type.
The shown reciever is a super regenerative type, wich may give interference with other remote circuits.
Better use a super heterodyne type.

On this website you will find modules that can be used for remote control:
http://www.quasaruk.co.uk/

Bertus
 

Thread Starter

nerdegutta

Joined Dec 15, 2009
2,684
Thanks, Bertus.

With the proper software, will the receiver circuit manage to receive what the transmitter is transmitting?

One time you posted a image of both a transmitter and a receiver. Two circuits in one image. Been searching, googleling and searching again to find the circuits, but nothing.

I got a few TX and RX, like those in the link. Now I was curios of making them self, and maybe integrate them in my prototype.
 

bertus

Joined Apr 5, 2008
22,270
Hello,

Keep in mind that the shown schematic is not crystal locked.
With standard ceramic capacitors the transmitter will drift with the temperature.
Use high quality capacitors with low a temperature coefficient.

Bertus
 

Thread Starter

nerdegutta

Joined Dec 15, 2009
2,684
Okay...


How about using the transmitter in the first post, and the receiver we found? Or is that also a super regenerative type?
 

bertus

Joined Apr 5, 2008
22,270
Hello,

The second receiver is also a super regenerative receiver.
There is a potmeter at the base to adjust the "sensitivity".
When this is not correctly adjusted, the receiver will act as an oscillator.

Bertus
 

DickCappels

Joined Aug 21, 2008
10,152
If you are referring to the heavy black object in the image below (there are two in the schematic), they are inductors formed of copper on a printed circuit board. Notice the one below has a 10 pf tuning capacitor across it.
upload_2018-7-20_22-37-19.png
 
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