Hello
i have about 300vdc after the first cap...it can be lowered with crc
mains power is quite stable
so question is..is 20 over, max on input..or can i go higher
how big is normal heatsink in this construktion ?
i have about 300vdc after the first cap...it can be lowered with crc
mains power is quite stable
so question is..is 20 over, max on input..or can i go higher
how big is normal heatsink in this construktion ?
Mains power varies all the time.
It is NEVER stable.
Measure the supply voltage and mains voltage.
Then calculate the supply voltage when mains is @ minimum and again for when mains is at maximum.
In the UK we use 216Vac to 254Vac. Europe is supposed to be the same range since we are supplied from the same harmonised supply.
It is NEVER stable.
Measure the supply voltage and mains voltage.
Then calculate the supply voltage when mains is @ minimum and again for when mains is at maximum.
In the UK we use 216Vac to 254Vac. Europe is supposed to be the same range since we are supplied from the same harmonised supply.
maybe or maybe not,,i am close to main trafo..in old day we watch light goes op and down in strange,,not more
if i have 254vac my tv and light will behave very bad--those 216 to 254 ,,is not here
therefor i say very stable mains volt
if i have 254vac my tv and light will behave very bad--those 216 to 254 ,,is not here
therefor i say very stable mains volt
Anyway, there is no benefit in feeding more than 25V DCin over DCout so "burn" excess DCin on something useful like CRC pre-filtering than taxing the input MOSFET with dissipation that will decrease its reliability especially in tubes vicinity, which up the local ambient temperature.
Denmark have the same as sweden i think. Which means +-10% is said to be within limits... Of course it also depends on which phase you use, and how far from the transformer you are. So if you are living close to transformer you'll probably have a bit high voltage, and the other way if you live far from it. Also, as always everything depends on loading.
Salas
i will get close to 20 to 25vdc over, on input..be fun to try it
Just to tell ..i work as electrician,,
i will get close to 20 to 25vdc over, on input..be fun to try it
Just to tell ..i work as electrician,,
Let's make it a bit more simple.
If your nominal DC supply is 300Vdc and the mains varies by +-1% then the DC supply also varies by a tiny bit less than +-1%, i.e. +-3V
If your mains electricity supplier uses the full +-10% of mains voltage, that is expected in many Countries, then the DC supply will vary by just a tiny bit less than +-30V, i.e. from ~270Vdc to ~330Vdc
If your shunt regulator is set to an output voltage of 200Vdc, then when mains supply is at+10%, the CCS part of the regulator must dissipate [330-200] * 0.07 = 9.1W
The Shunt part when there is no load attached will dissipate 200 * 0.07 = 14W
The total dissipation will be 23.1W
When mains voltage is @ -10%, the CCS will see [270-200] = 70V across it.
You can change the transformer output to much lower voltage, based on this approximate method using +-10%.
If your nominal DC supply is 300Vdc and the mains varies by +-1% then the DC supply also varies by a tiny bit less than +-1%, i.e. +-3V
If your mains electricity supplier uses the full +-10% of mains voltage, that is expected in many Countries, then the DC supply will vary by just a tiny bit less than +-30V, i.e. from ~270Vdc to ~330Vdc
If your shunt regulator is set to an output voltage of 200Vdc, then when mains supply is at+10%, the CCS part of the regulator must dissipate [330-200] * 0.07 = 9.1W
The Shunt part when there is no load attached will dissipate 200 * 0.07 = 14W
The total dissipation will be 23.1W
When mains voltage is @ -10%, the CCS will see [270-200] = 70V across it.
You can change the transformer output to much lower voltage, based on this approximate method using +-10%.
AndrewT
I can follow you..must take care of the input volt
i will make my 300vdc different..by using crc to lower the volt...or buy a new trafo.
I can see a shunt is worse to high input volt,,than the Maida regulator..i use now
will compare those 2 just to see of there are any difference in sound
best bjarne
I can follow you..must take care of the input volt
i will make my 300vdc different..by using crc to lower the volt...or buy a new trafo.
I can see a shunt is worse to high input volt,,than the Maida regulator..i use now
will compare those 2 just to see of there are any difference in sound
best bjarne
This is a "super shunt" as they are called when having a CCS input. Its not a shunt reg's intrinsic demand, but an additional quality and safety feature. The 400V spec is because of the DMOS spec used. It is safety spec in this case because the part normally sees what is across it, not across to earth. There are higher VDS MAX parts but more capacitive usually.
I build sshv2, all components fine. but no heat! q1 just barely warm to touch. rest transistors cold. 840 cold. input v is 230, output 200. I break something?
I use 5u4g>4uf cap>150ohm resistor>330uf> salas shunt. maybe too much inrush destroy regulator? 🙁
I use 5u4g>4uf cap>150ohm resistor>330uf> salas shunt. maybe too much inrush destroy regulator? 🙁
Last edited by a moderator:
See posts around #3935.
Have you tried with any load attached? It seems you had too low current set in the CCS.
yes, load attached- 12b4 preamp.
ccs resistor set at 100ohm. symptom same. 🙁
i only have gator clip probe. will check test point with wires attached.
ccs resistor set at 100ohm. symptom same. 🙁
i only have gator clip probe. will check test point with wires attached.
You should measure the voltage across test points and decipher it as mentioned in the guide. The counted current should be the max estimated current of your target device + 20mA.
Hello
Just finished my Salas sshv2--(thanks to Tea-Bag for super print)
Mounted the Salas with my new trafo (from Jms transformer) and 3 janzen filmcaps
first cap from rectifier is 33uf--100ohm--66uf--100ohm--66uf this give a output of
218vdc
and out of Salas 190vdc
Have compared the sound to My Maida regulator--they are close,but i will wait to i have play some more,,to give my full opinion
I use the Salas in my 4P1L preamp
And also thanks to Salas to made a great produkt
Best Bjarne
Just finished my Salas sshv2--(thanks to Tea-Bag for super print)
Mounted the Salas with my new trafo (from Jms transformer) and 3 janzen filmcaps
first cap from rectifier is 33uf--100ohm--66uf--100ohm--66uf this give a output of
218vdc
and out of Salas 190vdc
Have compared the sound to My Maida regulator--they are close,but i will wait to i have play some more,,to give my full opinion
I use the Salas in my 4P1L preamp
And also thanks to Salas to made a great produkt
Best Bjarne
Noise on SSHV2 output
How much noise is to be expected (or is acceptable) on the regulated output of an SSHV2? I am still trying to chase down noise in both phono and line stages of my SVP, and have eliminated all the most obvious possibilities (grounding, hum pickup, etc). One thing that has occurred to me is the possibility of a noisy HT line: unlike the RTP3, the SVP has pretty low PSU rejection.
The PSU is shared between channels: it consists of a 300VAC transformer, 1N4007 bridge rectifier, followed by CLC (3uF, 10mH, 47uF). Each channel of the SVP draws about 30mA. What would an acceptable ripple be on the regulated outputs? A first measurement with a DVM (in the absence of a scope) gives around 3mV, which strikes me as quite high.
Alex
How much noise is to be expected (or is acceptable) on the regulated output of an SSHV2? I am still trying to chase down noise in both phono and line stages of my SVP, and have eliminated all the most obvious possibilities (grounding, hum pickup, etc). One thing that has occurred to me is the possibility of a noisy HT line: unlike the RTP3, the SVP has pretty low PSU rejection.
The PSU is shared between channels: it consists of a 300VAC transformer, 1N4007 bridge rectifier, followed by CLC (3uF, 10mH, 47uF). Each channel of the SVP draws about 30mA. What would an acceptable ripple be on the regulated outputs? A first measurement with a DVM (in the absence of a scope) gives around 3mV, which strikes me as quite high.
Alex