Thanks snup, but tihis is not what I'm looking for. I already have unregulated power supply to my dac. Unregulated power supply does not protect my dac against any problems from my power net. Problems from my net are persistent. I live very close to the power central (100m) and I have very big surges and voltage spikes, plus on top of it the net is very old here. I need system that protect my dddac from that, and clean up in the same time the current. I have already made up my mind on balanced power supply and some antisurge protection mounted before it.
This is my inspiration scheme I found on internet. This one is for different values (800VA), where I want mine to be 3kVA, therefore I need to figure out a proper values for the snubber with chokes andthermistor eventualy.
If anyone could give me some advice on it I would apreciate it greatly.
This is my inspiration scheme I found on internet. This one is for different values (800VA), where I want mine to be 3kVA, therefore I need to figure out a proper values for the snubber with chokes andthermistor eventualy.
If anyone could give me some advice on it I would apreciate it greatly.
An externally hosted image should be here but it was not working when we last tested it.
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I had my testbench hit by lightning.
It hit a big oaktree just outside. Current went up sharply, as it went into the roots and jumped to the cable from the windmill supplying the bench. It wasn't funny.
It hit a big oaktree just outside. Current went up sharply, as it went into the roots and jumped to the cable from the windmill supplying the bench. It wasn't funny.
update
Hello,
I did start making some changes to my present DAC ( Curcio). I did have to open it to check the tubes and i noticed one of the caps did look a bit under pressure after 15 years of service. I did look for a cause and the only thing that could have caused its bad shape were two resistor close by that dissipate some heat. They are 2 1 watt 10K ohm in series to create 20K 2 watt but i will replace them with one 20K. Probably 5 watt mills wirewound and move them away from the cap.
I remember replacing the anode resistors in the Daniel preamp (also by MR Curcio). Original were also 1or 2 watt but there i did go for 12 watt Mills there. BIG improvement.
Will see what value i need in my tube dac.
My coworker did fibercut the stainless bars i needed for my dddac? chassis I could change it into a choke input classe A Nelson Pass amp.
Oooh yeah, will install a common mode choke input in my present dac . Parts have been ordered. Only have to find some ( schottky?)diodes.
Greetings, Eduard
Hello,
I did start making some changes to my present DAC ( Curcio). I did have to open it to check the tubes and i noticed one of the caps did look a bit under pressure after 15 years of service. I did look for a cause and the only thing that could have caused its bad shape were two resistor close by that dissipate some heat. They are 2 1 watt 10K ohm in series to create 20K 2 watt but i will replace them with one 20K. Probably 5 watt mills wirewound and move them away from the cap.
I remember replacing the anode resistors in the Daniel preamp (also by MR Curcio). Original were also 1or 2 watt but there i did go for 12 watt Mills there. BIG improvement.
Will see what value i need in my tube dac.
My coworker did fibercut the stainless bars i needed for my dddac? chassis I could change it into a choke input classe A Nelson Pass amp.
Oooh yeah, will install a common mode choke input in my present dac . Parts have been ordered. Only have to find some ( schottky?)diodes.
Greetings, Eduard
Attachments
Hello,
There a few resistors on the board that are 3 watt metaloxide. In the circuit the resistor are just to close to the cap. If i take a mills with longer leads i can have the resistor body at the location where the present resistors are connected together almost at the outside of the board.
I did remember when cutting the leads of the anode resistors in my old daniel preamps to make desoldering more easy the resistor body kind of split.
I dont know about the heat dissipated in the Tent shunt but i will pay attention to it once my new boards arrive. Almost sure i will mount them vertically.
Greetings, Eduard
There a few resistors on the board that are 3 watt metaloxide. In the circuit the resistor are just to close to the cap. If i take a mills with longer leads i can have the resistor body at the location where the present resistors are connected together almost at the outside of the board.
I did remember when cutting the leads of the anode resistors in my old daniel preamps to make desoldering more easy the resistor body kind of split.
I dont know about the heat dissipated in the Tent shunt but i will pay attention to it once my new boards arrive. Almost sure i will mount them vertically.
Greetings, Eduard
Hi Edward,
I always been envy with your sealed transformer and unable to source one til date.
Tentshunt can produce some heat dissipation and consistently from 45*C to 65*C pending on the input voltage. I measured it by a laser thermometer point direct on the board.
On other news, I am now in the process of boxing this DAC with the assistance from an audio friend. Anticipate it will weight close to 35kg if not more! Will post more complete photos soon. 🙂
This is it, a completed chapter to DDDAC. Now await for Doede DSD DDDAC for my next project, and appreciate the update from Doede himself! 😉
I always been envy with your sealed transformer and unable to source one til date.
Tentshunt can produce some heat dissipation and consistently from 45*C to 65*C pending on the input voltage. I measured it by a laser thermometer point direct on the board.
On other news, I am now in the process of boxing this DAC with the assistance from an audio friend. Anticipate it will weight close to 35kg if not more! Will post more complete photos soon. 🙂
This is it, a completed chapter to DDDAC. Now await for Doede DSD DDDAC for my next project, and appreciate the update from Doede himself! 😉
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Hello Chanh,
I will buy an infrared thermometer soon. I already did replace the resistor in my dac that did cause a cap to kind of disintegrate after 15 years. They are mounted to close and the two 10Kohm resistors which are in series have 165 volts across the pair of them. So they heat up. Now there are Mills wirewound and they are up in the air at the '' outskirts'' of the board.
Tomorrow i will get my new transformer so i can start using tube recifier in my dac. Lundahl choke allready ordered too to make a common mode choke input..
MAYBE you should install a fan in your dddac, electrolytic caps dont like heat. All these stragely mounted shunt will probably reduce airflow.
I hope that problem will be adressed with the new boards.
My dac is getting better
Greetings, Eduard
I will buy an infrared thermometer soon. I already did replace the resistor in my dac that did cause a cap to kind of disintegrate after 15 years. They are mounted to close and the two 10Kohm resistors which are in series have 165 volts across the pair of them. So they heat up. Now there are Mills wirewound and they are up in the air at the '' outskirts'' of the board.
Tomorrow i will get my new transformer so i can start using tube recifier in my dac. Lundahl choke allready ordered too to make a common mode choke input..
MAYBE you should install a fan in your dddac, electrolytic caps dont like heat. All these stragely mounted shunt will probably reduce airflow.
I hope that problem will be adressed with the new boards.
My dac is getting better
Greetings, Eduard