Ring modulation, not understanding the choice of part...

Thread Starter

BlackCow

Joined May 11, 2009
65
The basic schematic of a ring modulator on the wikipedia page...
http://en.wikipedia.org/wiki/Ring_modulation

I noticed the signal inputs / outputs go into transformers. I understand what a transformer does in respect to increasing/decreasing voltage and I understand how inductors work but I don't understand why it is being used for this circuit in this way.

Couldn't the signals go into the circuit through capacitors? Or perhaps I'm missing a concept here? Could anyone clarify this for me?

Thanks.
 

KL7AJ

Joined Nov 4, 2008
2,225
The basic schematic of a ring modulator on the wikipedia page...
http://en.wikipedia.org/wiki/Ring_modulation

I noticed the signal inputs / outputs go into transformers. I understand what a transformer does in respect to increasing/decreasing voltage and I understand how inductors work but I don't understand why it is being used for this circuit in this way.

Couldn't the signals go into the circuit through capacitors? Or perhaps I'm missing a concept here? Could anyone clarify this for me?

Thanks.
The ring modulator is actually a form of bridge, not too different from a Wheatstone bridge except for the diodes. When it is balance, there is no output, the signal from one side of the transformer is perfectly canceled out by the signal from the other side. The third port (I.F. port) allows a second signal to unbalance the bridge.


Eric
 

Thread Starter

BlackCow

Joined May 11, 2009
65
So basically the transformers don't set up or down an AC voltage but just couple the signal? Not sure where to find this part... do you think I could wind my own?
 
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