If you look in the Elektor Electronics Magazine (possibly Elektuur) They have one which they wind from a small torroid and is easy to make. They also give full details on the cores and where to get them ! That being said, why not go the optical route ? On Wednesday 28 August 2002 04:43 pm, you wrote: > I am using the CS8405 to generate the S/PDIF bitstream that Dave suggested. > I see from several sources that a transformer on the output is not > required, but is recommended for the consumer version of the digital audio > interface (S/PDIF). Do you guys who have done this before, generally put a > transformer on the output? If so, can you recommend a source for one? I > have been searching digikey, and have not been able to find a small, > inexpensive, 1:1 transformer. > > Thanks, > > --BobG > > -----Original Message----- > From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On > Behalf Of Dave Tweed > Sent: Monday, August 26, 2002 6:37 PM > To: PICLIST@MITVMA.MIT.EDU > Subject: Re: [EE]: SPDIF output advice > > "Robert E. Griffith" wrote: > > I have an audio project that currently uses a CS4334 DAC to provide L/R > > analog audio outputs from a digital I2S audio stream (from a STA013 mp3 > > decoder). I am trying to research SPDIF digital audio to see if I could > > support it as well. I have been googling for a while, but have not found > > any information on the physical line driving for SPDIF. > > > > Does anyone know of any good links for SPDIF digital audio? > > > > Does anyone know if there are line driver chips for SPDIF? Or, is it > > simple > > > enough that it is done with discrete components? > > If you've got I2S, the Cirrus/Crystal chips are a popular way to get > AES/EBU or S/PDIF. See > http://www.cirrus.com/design/products/index.cfm?c=12 > > The CS8405 is just a transmitter/driver. The CS8420 is a much more powerful > chip with a driver, a receiver and a sample rate converter that can be > combined in various ways. > > -- Dave Tweed -- Thank-you for your time. John Ward -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu