S/PDIF-JITTER.KILLER

By the circuit the following improvements are possible, which depend naturally strongly on the input signal and on the following THERE transducers entry stage:

It works all more calmly and more cleared up. The woman's voices are very silky. The high frequencies are less sharp. Everything works more vividly and more audible.

Structure: The jitter killer corrects the jitters of the afflicted input signals. The time errors of the input are revised by a PLL circuit (phase locked loop). (The PLL is an electronic switching configuration, which corrects the phase position and coherently with the frequency of a changeable oscillator in such a way over a closed automatic control loop affected that as small a phase deviation between an outside reference signal and the oscillator.)The PLL inserts time correct flanks and separates the signal levels of useless flanks. From the input signal the PLL wins a sturdy clock pulse, synchronously with that original beat of the input signal runs. - thus without jitters.

It engages 32 kHz, 44.1 kHz and 48 kHz automatically on the Sample frequencies.

Whereby the circuit is so co-ordinated that 44.1 kHz have „priority “, since the jitter killer is usually used with a CD-player.

Circuit overview:

S/PDIF out

S/PDIF

MMV PLL

32 - 44.1 - 48kHz

S/PDIF Jitter Killer with power suplply:

inputoptical s/pdif

outputs/pdif

The mains connection is supplied best by the transformer board or supplied by ownnoise filter.

48 kHz 44.1 kHz 32 kHz

error

Taking into operation:

After that supply voltage is connected and still no signal was applied the D4 and D1 are illuminated.

If a signal is attached, one LED should engage. E.G. D2.

If that is not the case, it can be possible that the reference voltage is not correct.

Examine the voltages at R15=3V24 R16=1V76.

If the voltages should not be correct, vary R7 so that the values to be correct.

Each jitter killer is tested here after the assembly and burned for several hours. It should function correct without the changes described above.

If you have the old CD-Pro2M use an additional digital output stage without transformer and connect the stage between out put of the CD-Pro and input of the jitterkiller as follows:

disconnect the jumper

Use the pin in the middle and connect it to the output stage. The Ground will be connected normally as shown on the PCB.

Now you have TTL format between the digital out and the jitter killer.