The output stage is a stabiliser to the s/pdif or AES/EBU signal for driving long lines and make it for the following stage easier to work. The heart it is the special transformer with silver/teflon wires that we have developed.
digital output stage
The PCB will be delivered with all connectors.
The digital output that comes from the CD-Pro2 or another digital source looks often not as a square wave. This might be a problem of the output transformer.
Output of a Philips CD 940
Our digital output stage will amply the signal coming from an s/pdif output too TTL signal level than stabilised over a LINE-driver and will be then divided into two separate signal paths with S/PDIF format and AES/EBU format. The output is galvanic decoupled by a special, hand made transformer with high-end powder ring core for digital signals and separate silver wire coils with PTFE isolation for AES/EBU and S/PDIF. With this output stage one can use longer lines without lost of performance and the signal was improved to a real square wave.
Ouput of the CD-Pro2
Hand made transformer for digital out and other applications:
The handmade transformer has the following advantages: One can use special ferrite powder-ring-core and adapt the meandering of the coils exactly on the circuit.
We use a high quality silver wire with Teflon isolation for the coils. The coils will be glued on the ring.
The Teflon/Silver wire has the following advantages in the opposite of enamelled wire:
less microphone effects
The wire is more softly and thus better to process. It puts closely to powder ring. In connection with the gluing a compact unit results.
A firm magnetic coupling develops also, because nearly the entire magnetic flow implements both windings.
Other crucial Components
For each task we use special condensers:
For the signal path MKP/FKP condensers of Vishay with small tolerance and outstanding high-frequency response.
For the supporting of voltage supply not-inductive MKT condensers of Philips.
For the logic circuits special condensers of Panasonic, not-inductively and with special high frequency characteristics
signal improvement of the digital outpustage with CD-Pro2LF
The original signal from digital out of the Cd-Pro2 looks like this...
This is the improved signal after the digital outout stage. It has better flanks and a higher amplitude.
Measures of the PCB in as-delivered condition: 71 x43 mm