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Homebuilding Diode Ring Mixers




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Homebuilt diode ring mixers are also easy to make and can be quite a cost savings. A doubly-balanced diode ring mixer has two unbalanced to balanced transformers and a diode ring. The impedances at the three ports is 50 ohms. The transformers are wound with #28 AWG enamel coated wire on a FT37-43 ferrite toroidal core using a trifilar (three wire) technique. The wire twisting and winding technique is done as described above for the bifilar transformers. The connections 2b and 3a are twisted together and soldered. Again you will have to develop a technique to help you distinguish the wires from one another.

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