PSB for teleporter
Hi,
I just received my teleporters and going to build one of them into my cdpro2 transport. Because this is housed into a tight chassis the power supply needs to be small in size.
Brian Donegan also told me that the supply is not that critical because the teleporters have their own voltage regulators, but is should be descent. So I'm planning to use a LM317 based power supply. The LM317 should have low ripple (80 db rejection). Would the supply be good enough for the teleporter?
Hi,
I just received my teleporters and going to build one of them into my cdpro2 transport. Because this is housed into a tight chassis the power supply needs to be small in size.
Brian Donegan also told me that the supply is not that critical because the teleporters have their own voltage regulators, but is should be descent. So I'm planning to use a LM317 based power supply. The LM317 should have low ripple (80 db rejection). Would the supply be good enough for the teleporter?
Attachments
Last edited:
Abosultely. I would make it output 5-6V.
The LDO on the teleporter is very good. So you have a lot of flexibility.
Thanks!
should I connect my cdpro2 I2S output like this? Assuming that the serial clock is the same as the bit clock.
EDIT: What about the ground from the I2S
Attachments
From the source you must connect GND and the signals to the Teleporter.
I can't speak for the CDPro output, but what you say sounds correct. One thing to keep in mind is that as far as I know the CDPro has a 48fs bit clock. Keep in mind that many DACs including the Buffaloes need a 64fs bit clock.
No, but if you know which transport it uses you can probably find the datasheet.
Yes an unlock in this case is typically not about the source at all. It is usually ground bounce or DC on the mains.
Last edited:
Dimmers are notorious for creating DC on mains. DC on mains can create very large EMI spikes which is why you get the unlocks.
This also could also indicate (Just guessing because I have not seen it occur) that you need to make sure your source and your DAC are close to the same ground potential. The DC potential between the two may be too high. In cases like this make sure both the source and the DAC are well earthed and the problem should be resolved.
unlocks
Thanks for the responses.
Last night I did searches for lock problems on the TP Support Forum. Only got through the first three pages.
As to the ground potential difference, probably. The dac is in the living room and pc is in the kitchen, different AC lines. Getting them well grounded
could be a problem, our home built in the 50's is two wire not the three wire system.
Didn't have the lock problems when using coax to send sp/dif. Ground on cable saved the day? But I was going into the spdif-reciever then into the dac I2S inputs.
--------------------------------------------------------------------------------------
Just tried connecting pc&teleporter ground via a long wire to the dac ps.
Before connecting wire to dac I measured .23dcv & .9acv between ground wire and dac ps ground.
It did not make a difference. Lights, refrigerator motor starts/stops still cause unlocks!
I first tried the teleporters between a Phillips CD80 and the BII to transmit I2S signals. Can't recall now, if the lock problem occurred then. Both devices were on the same AC outlet. But, between every track there was a squelch. The I2S signal was tapped at the decoder output. I tried tapping at the SAA7220/DigitalFilter outputs tp the dac, but that wouldn't fly. I seem to recall that the 7220 level shifted the output to the dac for some reason!?
Thanks for the responses.
Last night I did searches for lock problems on the TP Support Forum. Only got through the first three pages. As to the ground potential difference, probably. The dac is in the living room and pc is in the kitchen, different AC lines. Getting them well grounded
could be a problem, our home built in the 50's is two wire not the three wire system.
Didn't have the lock problems when using coax to send sp/dif. Ground on cable saved the day? But I was going into the spdif-reciever then into the dac I2S inputs.
--------------------------------------------------------------------------------------
Just tried connecting pc&teleporter ground via a long wire to the dac ps.
Before connecting wire to dac I measured .23dcv & .9acv between ground wire and dac ps ground.
It did not make a difference. Lights, refrigerator motor starts/stops still cause unlocks!
I first tried the teleporters between a Phillips CD80 and the BII to transmit I2S signals. Can't recall now, if the lock problem occurred then. Both devices were on the same AC outlet. But, between every track there was a squelch. The I2S signal was tapped at the decoder output. I tried tapping at the SAA7220/DigitalFilter outputs tp the dac, but that wouldn't fly. I seem to recall that the 7220 level shifted the output to the dac for some reason!?
Last edited:
That is why I forbid my girlfriend to buy lights that use a dimmer. Perhaps a good mains filter (not Y-filter) will do the trick. I use medical grade filters from Corcom. They don`t have any leaking current to the main ground and no degration in sonics at all.