dtes,
how do you measure the internal temperature of a transformer?
How do you know if your duty overheats the transformer?
What does the transformer manufacturer tell you about drawing AC current from the transformer?
What does the transformer manufacturer tell you about drawing DC current from the transformer?
It appears you are completely ignoring what the manufacturer tells you about his own product.
how do you measure the internal temperature of a transformer?
How do you know if your duty overheats the transformer?
What does the transformer manufacturer tell you about drawing AC current from the transformer?
What does the transformer manufacturer tell you about drawing DC current from the transformer?
It appears you are completely ignoring what the manufacturer tells you about his own product.
with a help of infra-red gun it shows about 50-55c on the surface in non ventilated enclosure.
Don't know that actually. The set of IC + Salas reg that I'm feeding requires about 80% of current that is written on the transformer.
well..not much info I found.
not on purpose, simply learning on practise from experts' advices and info in the thread, hate books
Anyway, I've got your point regarding toroid!
Cheers
and the internal temperature is?
max continuous AC current = VA / Vac when feeding a resistor.
Max continuous DC current = VA / Vac / 1.414 * de-rating factor when feeding a capacitor input filter through a bridge rectifier.
The manufacturer will tell you the de=rating factor for that transformer. Expect it to be ~0.7
This results in a max continuous DC current of ~ half the max AC current.
You must check the manufacturer's data on how to use their product.
max continuous AC current = VA / Vac when feeding a resistor.
Max continuous DC current = VA / Vac / 1.414 * de-rating factor when feeding a capacitor input filter through a bridge rectifier.
The manufacturer will tell you the de=rating factor for that transformer. Expect it to be ~0.7
This results in a max continuous DC current of ~ half the max AC current.
You must check the manufacturer's data on how to use their product.
understood, Sir!
now I have the feeling that I know everything regarding PS
sorry, about 50c is with an open lid of the case, ~55 showed after an hour of operating with a closed one.
now I have the feeling that I know everything regarding PS
sorry, about 50c is with an open lid of the case, ~55 showed after an hour of operating with a closed one.
That is not what post2157 said.
1.3Adc is 65times the current consumption of the buffer circuit.
That means you would have 64/65ths of the current throughput of the Salas Reg for "hot-rodding".
Whereas a 80mA DCB1 would have only 3/4 of the throughput as regulator overhead.
That is a mighty big leap into "hot-rodding" territory. Particularly when one considers that 200mA and 600mA are both "hot-rodding" options.
Last edited:
Ended up replacing all fets with new and spares - 240s and 9140s. This time with lots of arctic silver on fets/pads/chassis contact. Now I have a tight -10.2 and 10v. With 1.5R instead of 1R I am pulling 866mA and 1A
. But I have a PC fan on the enclosure (Antek 12in*12*2) so we'll see how it goes. An infrared thermometer is on the way so I can properly gauge temps. Not sure what happened before, must have shorted something?
Last edited:
1A is more refined with increased three dimensional qualities. Not huge but noticeable. I also swapped out Muse KW 100ufs for Silmic IIs and the 470r metals for carbon comp. Not sure which is responsible but delivery is smoother - there was a slight etchiness before, not bad per se but board sounds different now.
Heat dissipation is MUCH better; the chassis is barely warm by the fets at shutdown.
Heat dissipation is MUCH better; the chassis is barely warm by the fets at shutdown.
Ok, I've been using 100R with dcb1 more or less directly to the amp with only a few inches of wire. I am curious because with this current build and the previous I have found the lower I go the more dynamic, open, and transparent the sound (previous amp had 7kinput imp, current amp 16k)...
A lower value of gate stopper allows the FET to operate faster. The filter created by the gate stopper and the internal capacitance of the FET moves to a higher frequency.
You can go as low as you like with the gate stopper value. The limit will be when instability sets in.
You will need to test the circuit thoroughly with all manner of interference and fast changing demands to ensure that stability is good. The lower the gate stopper value the more thorough your testing regime must be.
Or just play safe and use the recommended value or half the recommended value if you like to take chances.
But listening and hearing extra detail may be the sign/symptom that the PSU has already reached the instability operating area and the non smooth output is affecting the amplifier and giving the "sound effect" of extra detail.
you really need to test the PSU properly if you reduce the gate stopper value.
You can go as low as you like with the gate stopper value. The limit will be when instability sets in.
You will need to test the circuit thoroughly with all manner of interference and fast changing demands to ensure that stability is good. The lower the gate stopper value the more thorough your testing regime must be.
Or just play safe and use the recommended value or half the recommended value if you like to take chances.
But listening and hearing extra detail may be the sign/symptom that the PSU has already reached the instability operating area and the non smooth output is affecting the amplifier and giving the "sound effect" of extra detail.
you really need to test the PSU properly if you reduce the gate stopper value.
Can you share some details of how to do this? (The PSU testing part, I know how to change the gate stopper
)