Small Audio Transformers

small audio transformers were originally used in valve or tube amplifiers as interstage and output transformers.  small audio transformers that are distributed as individual parts are processed in bulk packs, while components that have leads in four-sides use trays.  small audio transformers are used in car radios and broadcast equipment, and in sound reinforcement applications.  small audio transformers: small audio transformers are involved in the transmission of voice or sound signals. 

There are two basic types of small audio transformers with each having multiple functions:Step-up / Step-down transformers.  A second limitation is that small audio transformers have a maximum input level that cannot be exceeded without causing a distorted signal.  A third limitation is that small audio transformers cannot step up a signal by more than about 25 dB when used in typical audio circuits.  Early transistor amplifiers similarly used small audio transformers for coupling and output stages.  There is nothing particularly mystical about small audio transformers although their use is not particularly widespread today.  Typically, small audio transformers are encased in a magnetic shielding which is filled with an epoxy resin that provides insulation, protects the windings, and prevents vibration of the core material.  Some small audio transformers do not have a center tap, while other devices have a center tap in only the primary side, only the secondary side, or in both the primary and secondary sides. 

There are high quality small audio transformers in the markes that meet those specs,but those can be quite expensive.  I built some of my audio line isolators usign two high quality telephone line couplingtransformers which have 600 ohm impedance (I built later some new ones usingsome high quality small audio transformers).  If you are looking for very good sound quality, you might want to investto some better quality (and much mor eexpensive) small audio transformers.  Manufactures general purpose small audio transformers for ground isolation, for splitting and for low turns ratio microphone input; microphone input transformers for impedance matching between microphone unit and amplifier input; line input small audio transformers for bridging input or for Zero Field input circuits; line output small audio transformers with silicon iron C cores; output transformers, interstage transformers, mains transformers; AES/EBU digital transformers, video isolation transformers, and telephone hybrid transformers.  Manufacturer of miniature pulse transformers for electro-medical patient connected products, miniature switch mode transformers for lighting applications, magnetics for SMPS, hi-fi small audio transformers and chokes, miniature high voltage transformers, low audio noise magnetics, miniature incapsulated line power transformers, miniature coils, inductors, chokes, and ballasts.  Manufactures small audio transformers, coils, current transformers, filters, inductors, power transformers, pulse transformers, RF & IF transformers, step up/step down transformers, toroids, band pass filters, and surface mount coils and transformers, for medical, telecommunications devices, radar systems, computers, lasers, avionics, audio/visual equipment, industrial controls, consumer products and power supplies.  Low level small audio transformers are normally wound on mu-metal cores, although somespecalised types are wound on ferrite. 

High level small audio transformers are all wound ongrain oriented silicon steel.  High level small audio transformers are all wound ongrain oriented silicon steel.