Hello Salas, I think SSHV2 output 420v, capacitor withstand voltage is enough, two 68k resistor values need to be increased? Is there anything else I need to pay attention to? Thank you!
That's on the verge of what Q1 can be reliable with, but to reach it it's a matter of increasing those 68k resistors, yes. Unless the particular JFET sample installed has more Idss than usual to can push the existing resistors bit more at trimmer's max.
你好萨拉斯，谢谢你的回复，出于安全原因我会仔细试一试，今天我发现了一个奇怪的问题，就是这样的安装过程，认为不需要散热器DN2540由于不小心安装840，断电输出没有电压，发现重新安装DN2540后一切正常，但发现整流桥接后消耗了52ma电流， RS只有32ma电流，有20ma不知道消耗在哪里，散热器高温有70摄氏度，还没有找到原因
Hello Salas, thanks for the reply, for safety reasons I will try carefully, today I found a strange problem, the process is such an installation, that does not need a radiator DN2540 due to careless installation of 840, power on the output without voltage, found after reinstalling the DN2540 everything is normal, but found that the rectifier bridge after the consumption of 52ma current, RS only 32ma current, there is 20ma do not know where the consumption is, the radiator high temperature has 70 degrees Celsius, has not found the reason
The current on the Rs resistor (10R) is adjustable and the output voltage is adjustable, but the current consumption of the rectifier 52ma-Rs32ma=20ma is not known where it occurs
If you don't use a dummy test load to throw the 32mA in it, the whole 52mA will burn on the IRF840 at high voltage making it too hot. Only the +20mA above load is recommended to go in the 840 for good spec running of the shunt regulator.
It was measured under connected load, the load current was 12ma, I adjusted R4 (200R) so that RS(10R) was 32ma, everything was normal, but at this time the original power supply consumed 52ma, (measuring the original power filter choke voltage drop conversion current) more than 20ma, I want to know if SSHV2 itself needs to consume current? Thank you!
The original power supply is 10cm away from SSHV2, and 1uf MKP is added to the SSHV2 input, which should not oscillate, but it does add 20ma
It needs to consume few mA of current for its small transistors to bias them and more for the IRF840 to achieve low output impedance spec. That is why we add 20mA extra CC setting above what we expect as peak consumption from load's side.
All we ever talked in this thread was in relation to the DC mA we set with the trimmer in the regulator's constant current source. When you measure elsewhere before the regulator its possible there are reactive component factors changing your incoming mA calculated indication. But we have not followed the matter in the past to tell you what to expect there. People use various rectification and filter styles anyway. Tube or solid state rectifier, choke or no choke, different values of storage capacitors, RC filter resistors, bleeder resistors etc.
You can change that 1uF DC input decoupling capacitor to 0.1uF and see if there's difference in mA indication on that choke. You can also use a cheap wall power monitor for indication to avoid probing in raw HV places like chokes etc. But don't forget it installed when to critically listen. Avoid that device's unknown impedance and other possible effects between audio equipment and wall power after noting consumption readings.
All we ever talked in this thread was in relation to the DC mA we set with the trimmer in the regulator's constant current source. When you measure elsewhere before the regulator its possible there are reactive component factors changing your incoming mA calculated indication. But we have not followed the matter in the past to tell you what to expect there. People use various rectification and filter styles anyway. Tube or solid state rectifier, choke or no choke, different values of storage capacitors, RC filter resistors, bleeder resistors etc.
You can change that 1uF DC input decoupling capacitor to 0.1uF and see if there's difference in mA indication on that choke. You can also use a cheap wall power monitor for indication to avoid probing in raw HV places like chokes etc. But don't forget it installed when to critically listen. Avoid that device's unknown impedance and other possible effects between audio equipment and wall power after noting consumption readings.
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You're welcome. Let us know what happened and how you will like the sound in your application.
Greeting! The problem was found, it was my fault, because the DN2540 was soldered on the front of the pcb, and too much solder spilled on the back of the pcb caused the pins to short circuit the DS, which is a shame! SSHV2 power supply is cleaner than the traditional power supply sound, has a better sense of layering, high-quality traditional power supply sound is more intense, but the soundstage is not SSHV2 can be opened, this is my sense of hearing, thank you again for Salas selfless dedication! Cheers!
Congratulations for troubleshooting. Many times misbehavior in electronics is due to random construction imperfections.
Even in automated surface mount production by robots there are failures. Else they wouldn't try the boards with bed of nails electrical parameters testing in the end.
Also happy to know you like the sound. Shunt reg wants to promote clean but also relaxed and layered feeling. Sense like Class A. What is your application circuit? Line amp? Phono amp? Having a picture to show?
Even in automated surface mount production by robots there are failures. Else they wouldn't try the boards with bed of nails electrical parameters testing in the end.
Also happy to know you like the sound. Shunt reg wants to promote clean but also relaxed and layered feeling. Sense like Class A. What is your application circuit? Line amp? Phono amp? Having a picture to show?
Hi Salas, I applied him in a vinyl phono amplifier, the suppression of ripple is better than the traditional power supply, thanks, also, I suddenly thought of a line, please SSHV2 has a negative voltage version?
No it does not come in a natively negative version. You could go creative puting two in series like in lab supplies though. Then their tie point becomes virtual zero. The bottom supply becomes negative in relation to the top one. Like you can also do with battery cells for dual rail op-amps. Takes to use independent secondaries and rectifiers for each one psu though. So they can float.
I'm sorry, but the translation system used for the written language is not familiar with it, and it often goes wrong
