A DEVICE FOR MODULATING AUDIO FREQUENCY SIGNALS

Abstract : A device is described for modulating audio frequency signals. It consists primarily of transistorized amplifiers assembled in construction units, with a multi-throw switch placed at the input of the entire amplification sequence, an input preamplifier, two multipole switches placed between the output terminals of the preamplifier and the input terminals of the following correction amplifier or the input terminals of the regulator of the signal level, and an equalizing amplifier. There are collector buttons placed between the output terminals of the equalizing amplifier by collection terminals, a multi-throw switch attached by collection contacts to the input terminals of the output amplifier, the collection contacts of which are connected with the input terminals of the input preamplifier, and which are connected by special contacts of the collector buttons with the terminals of the output collector. By putting the corresponding button into a working position there will be an interruption of the connection between output switch and the corresponding collection terminal. The two points of the subject of the patent follow.