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Re: RV: PSUDII giving enough power but real world not!!!
Hi Felipe,
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"Thank you, could adding more capacitance to the PSU be the solution?"
"I'm using a bleeder resistor of 100K to discharge the capacitors of the raw PSU, could be a problem?"
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I've already offered some advice on troubleshooting to take this forward. No disrespect, but I'm not looking to type the same reply out again.
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As this is clearly not a PSUD2 related issue, I'm closing the topic.
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Regards,
Duncan
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Re: RV: PSUDII giving enough power but real world not!!!
Hi Duncan,
I'm using a bleeder resistor of 100K to discharge the capacitors of the raw PSU, could be a problem?
Bst rgds
Felipe
Hi Duncan,
Thank you, could adding more capacitance to the PSU be the solution?
Bst rgds
Felipe
Hi Felipe,
?
I'm unsure of what further help I can offer; PSUD seems to give the right numbers against LTSpice, so based on the information you have provided, the supply should give 60mA at 323 Volts or so.? All I can suggest is checking each component in turn to check
for failure as part of the fault finding routine.
?
Start at the beginning, test the transformer off load then with a light bulb attached - check the AC voltages in both cases. Check that the rectifiers are giving a reading in one direction on an ohmmeter, but not in the other. Check the capacitors with
an ohm meter for shorts (sometimes the dielectric can puncture).
?
Regards,
Duncan
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Locked
Re: RV: PSUDII giving enough power but real world not!!!
Hi Duncan,
Thank you, could adding more capacitance to the PSU be the solution?
Bst rgds
Felipe
Hi Felipe,
?
I'm unsure of what further help I can offer; PSUD seems to give the right numbers against LTSpice, so based on the information you have provided, the supply should give 60mA at 323 Volts or so.? All I can suggest is checking each component in turn to check
for failure as part of the fault finding routine.
?
Start at the beginning, test the transformer off load then with a light bulb attached - check the AC voltages in both cases. Check that the rectifiers are giving a reading in one direction on an ohmmeter, but not in the other. Check the capacitors with
an ohm meter for shorts (sometimes the dielectric can puncture).
?
Regards,
Duncan
?
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Hi,
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I'm afraid PSUD2 won't do common mode chokes due to the way the voltage sources work and PSUD3 doesn't have this on the roadmap either.
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If I was doing this, I'd probably model it in a SPICE simulator by having two coupled inductors with some leakage, but I've no idea how much leakage to dial in.
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Sorry, I know that isn't much help.
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Regards,
Duncan
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Hello, I use a common mode choke in my power supplies, but I'm really just guessing about the results I'm getting. I'd prefer to model them in software, but I can't figure out how to include one in yours. See Fig. 8:?
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Except in my circuits, the +/- rails are split with the ground in the center. I use a rail splitter circuit for that. His simulation seems to show very good performance, but I'd like to be able to do this in your software. I've tried to do it in a spice simulator like Tina Ti, but I can't get it to work. That's why I prefer your software.?
Thanks.?
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Hi Stephen,
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Sorry to hear the list of rectifiers is not coming up. Do you get a message at startup "Unable to load default PSU"? Also, I've included details of the end to end process below:
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TO CHANGE TO VACUUM TUBE / VALVE RECTIFIER
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Hover the mouse cursor over the PSU so the transformer and rectifier all light up yellow by positioning on the word "Bridge (SS)". Right click and select Change. Click on Full Wave and then OK.
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TO CHANGE RECTIFIER TYPE
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If you hover over the rectifier(s) there will be a yellow block surrounding them. Once they are "in scope", you can right click on the rectifiers and select Edit. This should bring up a rectifier selection window:
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From here you should be able to pick GZ34 or 5AR4 (they are identical models). The rest should be as the instructions in the help file on Modelling Your First Power Supply.
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Hope this helps but come back to me if this isn't working for you.
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Regards,
Duncan
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Hi Duncan
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I have downloaded psud2_build79, and I think I need to create a new rectifier model to cover the GZ34/5AR4.
On the other hand it looks like it might already be modelled in a library of rectifiers (that I can't find).
Sorry to be dim-witted Duncan.
Is there already a pre-existing model, or do? I scratch build the model?
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Cheers
Stephen Spicer
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firstsinhifi.com
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Re: RV: PSUDII giving enough power but real world not!!!
Hi Felipe,
?
I'm unsure of what further help I can offer; PSUD seems to give the right numbers against LTSpice, so based on the information you have provided, the supply should give 60mA at 323 Volts or so.? All I can suggest is checking each component in turn to check for failure as part of the fault finding routine.
?
Start at the beginning, test the transformer off load then with a light bulb attached - check the AC voltages in both cases. Check that the rectifiers are giving a reading in one direction on an ohmmeter, but not in the other. Check the capacitors with an ohm meter for shorts (sometimes the dielectric can puncture).
?
Regards,
Duncan
?
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Locked
Re: RV: PSUDII giving enough power but real world not!!!
Hi Duncan,
Attached power transformer specs.
Regards
Felipe
Hi Felipe,
Thanks for the feedback. My suggestion would be to measure the voltage before the choke and after the choke, please do these for both on load and off load it might point to what is going wrong.
Regards,
Duncan
On Mon, 17 Feb 2025 at 13:31, felipe cerrillo vindel via
<fcv= [email protected]> wrote:
Hi Duncan,
Yes not enough power for my real world circuit, when I use CCS as anode load maximum can get is 26mA so 13mA per channel in place of 30mA per channel.
Thanks & regards
Felipe
Hi Felipe,
?
I ran this circuit with the choke through LTSpice and it gives 323.2 Volts, quite close to the results you are getting from PSUD.
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PSUD might be getting confused by the very low value or R on the final RC filter (0.75 ohms) but other than that, the results look OK.
?
When you say not enough power, what are you seeing from your real world circuit?
?
Regards,
Duncan
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--
Duncan Munro
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Re: RV: PSUDII giving enough power but real world not!!!
Hi Duncan,
Isn't the choke because connected without the choke & problem remains.
Thanks for help & regards
Felipe
Hi Felipe,
Thanks for the feedback. My suggestion would be to measure the voltage before the choke and after the choke, please do these for both on load and off load it might point to what is going wrong.
Regards,
Duncan
On Mon, 17 Feb 2025 at 13:31, felipe cerrillo vindel via
<fcv= [email protected]> wrote:
Hi Duncan,
Yes not enough power for my real world circuit, when I use CCS as anode load maximum can get is 26mA so 13mA per channel in place of 30mA per channel.
Thanks & regards
Felipe
Hi Felipe,
?
I ran this circuit with the choke through LTSpice and it gives 323.2 Volts, quite close to the results you are getting from PSUD.
?
PSUD might be getting confused by the very low value or R on the final RC filter (0.75 ohms) but other than that, the results look OK.
?
When you say not enough power, what are you seeing from your real world circuit?
?
Regards,
Duncan
?
--
Duncan Munro
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Locked
Re: RV: PSUDII giving enough power but real world not!!!
Hi Felipe,
Thanks for the feedback. My suggestion would be to measure the voltage before the choke and after the choke, please do these for both on load and off load it might point to what is going wrong.
Regards, Duncan
On Mon, 17 Feb 2025 at 13:31, felipe cerrillo vindel via <fcv= [email protected]> wrote:
Hi Duncan,
Yes not enough power for my real world circuit, when I use CCS as anode load maximum can get is 26mA so 13mA per channel in place of 30mA per channel.
Thanks & regards
Felipe
Hi Felipe,
?
I ran this circuit with the choke through LTSpice and it gives 323.2 Volts, quite close to the results you are getting from PSUD.
?
PSUD might be getting confused by the very low value or R on the final RC filter (0.75 ohms) but other than that, the results look OK.
?
When you say not enough power, what are you seeing from your real world circuit?
?
Regards,
Duncan
?
|
Locked
Re: RV: PSUDII giving enough power but real world not!!!
Hi Duncan,
Yes not enough power for my real world circuit, when I use CCS as anode load maximum can get is 26mA so 13mA per channel in place of 30mA per channel.
Thanks & regards
Felipe
Hi Felipe,
?
I ran this circuit with the choke through LTSpice and it gives 323.2 Volts, quite close to the results you are getting from PSUD.
?
PSUD might be getting confused by the very low value or R on the final RC filter (0.75 ohms) but other than that, the results look OK.
?
When you say not enough power, what are you seeing from your real world circuit?
?
Regards,
Duncan
?
|
Locked
Re: RV: PSUDII giving enough power but real world not!!!
Hi Felipe,
?
I ran this circuit with the choke through LTSpice and it gives 323.2 Volts, quite close to the results you are getting from PSUD.
?
PSUD might be getting confused by the very low value or R on the final RC filter (0.75 ohms) but other than that, the results look OK.
?
When you say not enough power, what are you seeing from your real world circuit?
?
Regards,
Duncan
?
|
PSUDII giving enough power but real world not!!!
Hi Duncan,
Attached simulations with PSUDII of the PSU not giving enough power? but real world not enough power, any idea why?
Tried without the choke without?success.
Thanks & regards
Felipe
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Locked
RV: PSUDII giving enough power but real world not!!!
Hi Duncan,
Tried without the choke with success.
Regards
Felipe
De: felipe cerrillo vindel <fcv@...>
Enviado: lunes, 17 de febrero de 2025 12:28
Para: [email protected] <[email protected]>
Asunto: PSUDII giving enough power but real world not!!!
?
Hi Duncan,
Attached simulations with PSUDII of the PSU not giving enough power? but real world not enough power, any idea why?
Thanks & regards
Felipe 
Hi Felipe,
This is the old version so the previous advice will not help you. Could you please email your rectifiers.txt file to me at postmaster@... and I will take a look at it for you, thanks.
Regards,
Duncan
?
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PSUDII giving enough power but real world not!!!
Hi Duncan,
Attached simulations with PSUDII of the PSU not giving enough power? but real world not enough power, any idea why?
Thanks & regards
Felipe 
Hi Felipe,
This is the old version so the previous advice will not help you. Could you please email your rectifiers.txt file to me at postmaster@... and I will take a look at it for you, thanks.
Regards,
Duncan
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Re: How to run PSUD on macOS or Linux/ARM?
ssd's are relatively cheap these days.? U don't need something huge.
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Re: How to run PSUD on macOS or Linux/ARM?
AND you can stick in an SSD to make it a screamer for very little DoReMi...
- Ian
toggle quoted message
Show quoted text
On 2/5/2025 12:33, Paul Reid via groups.io wrote: On 2/5/2025 3:26 PM, Ian Eales via groups.io wrote:
a perfectly good machine at a thrift store. True. I did. An H-P commercial/office PC on Win10. It runs. Slowly because I have been spoiled by SSDs. It is HEAVY (that office heritage) and hard to work in. Even free they (she had a dozen) was not attractive.
These odd-brand Asian PCs are cheaper than a good anniversary dinner, more than speedy enough for PSUD.
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Re: How to run PSUD on macOS or Linux/ARM?
On 2/5/2025 3:26 PM, Ian Eales via groups.io wrote: a perfectly good machine at a thrift store. True. I did. An H-P commercial/office PC on Win10. It runs. Slowly because I have been spoiled by SSDs. It is HEAVY (that office heritage) and hard to work in. Even free they (she had a dozen) was not attractive. These odd-brand Asian PCs are cheaper than a good anniversary dinner, more than speedy enough for PSUD.
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Re: How to run PSUD on macOS or Linux/ARM?
You can probably get a perfectly good machine at a thrift store.
It might take a bit of legwork, but great bargains are available.
- Ian
toggle quoted message
Show quoted text
On 2/5/2025 10:50, Paul Reid via groups.io wrote: As Duncan posted here recently- get cheap Windows machine. It may not be the answer you wanted, but it may be expedient.
me>???? I am seeing minimal-spec Windows machines under $300
I've bought 5 mini PCs since August, two cost real money, however three of them have been bargain basement "Celeron" type machines going for GBP ?149 with 500GB solid state drive and 16GB of DDR memory. At today's rates, that's USD $187 a piece pre-loaded with Windows 11 and they run great out of the box.
For single-threaded stuff like PSUD they are still over 50% of the speed of a Core i9 machine costing 6 times the price. Computing has never been cheaper in real terms :)
Regards,
Duncan
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Ian Eales
Paul Reid