An electronic mixer is a device for mixing two or more electronic signals. There are two basic types of mixer. Additive mixers add two signals together, and are used for such applications as audio mixing. Multiplying mixers multiply the signals together, and produce an output containing both original signals, and new signals that have the sum and difference of the frequency of the original signals. Two digital voltmeters The field of electronics is the study and use of electronic devices that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. ... Signaling, or signal, may mean: Look up signal in Wiktionary, the free dictionary. ... BBC Local Radio Mark III radio mixing desk In professional audio, a mixing console, mixing desk (Brit. ... Sine waves of various frequencies; the lower waves have higher frequencies than those above. ...

Additive mixers are usually resistor networks, surrounded by impedance matching and amplification stages. Resistor symbols A resistor is a two-terminal electrical or electronic component that passes a current that is proportional to the potential difference between its terminals in accordance with Ohms law. ... This article or section should be merged with Maximum power theorem. ...

Multiplying mixers have been done in a wide variety of ways. The most popular are diode mixers, gilbert cell mixers, diode ring mixers and switching mixers.

A diode mixer has two or more signals going into a diode. Whenever any signal pushes the voltage above the threshold of the diode, current will flow to the other side, but not back. If the inputs are the right voltages, the result is that the peaks of the new signal occur whenever either signal peaks, and the diode supplies the troughs by refusing to conduct backwards. The classic crystal set radio is a diode mixer, with a simple electronic filter between the antenna and mixer to eliminate unwanted radio stations. Cheap AM radios still use diode mixers. Types of diodes A diode can be thought of as the electronic version of a one-way valve. ... Electronic filters are electronic circuits which perform signal processing functions. ...

Gilbert cell mixers are just an arrangement of transistors that multiplies the two signals. Surprisingly, the switching mixers (below) pass more power and usually insert less distortion.

Diode ring mixers are the original switching mixer. They have two transformers and an array of diodes in a ring. Basically, the transformers are arranged so that one signal switches the diodes to conduct in one direction, or the other direction. The other transformer pushes its signal through the diodes. Diode ring mixers are popular because the on/off mechanism injects less noise, and loses less signal power than other methods. Also, the transformers can be wound to match the impedances into and out of the mixer stage to the rest of the electroic system. Transformers - Typical electrical configurations. ...

Switching mixers use an array of Field effect transistors or (in older days) vacuum tubes. These are used as electronic switches, to permit the other signal to go one direction, then the other. They are controlled by the signal being mixed. They are especially popular with digitally-controlled radios. The field-effect transistor (FET) is a transistor that relies on an electric field to control the shape and hence the conductivity of a channel in a semiconductor material. ... In electronics, a vacuum tube (American English) or (thermionic) valve (British English) is a device generally used to amplify, or otherwise modify, a signal. ...