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Old 23rd Aug 2018, 10:02 pm   #1
k_yller
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Default HT power supply (in progress)

Some time ago I found that what I need is next HT power supply
more compact that my "beaste boys" (20kg weight each) but more powerfull then few tiny I have.
Project
200-400V at 200mA + grid up to 100V +powerfull 6A 6,3 V all totaly independent (floating)
HT part
Valves (2xPL504+EF80+Str85/10)
standard regulator with reference voltage on Str85/10,

Grid Supply
silicon LR8 chip
Support
Support power supply 5V for HT part meters and cooling fan
Voltage mulitplier for EF80
tiny suport power supply for Grid part meters

Transformer #1
180VA with HT winding + tapped 6,3 V winding + 2 V winding (mutliply for EF80 heater) + 2 extra windings 20V and 30V (one will be used for grid meters)
Transformer#2
toroidal transformer for PL504 heaters

Some basic drawings and chassis
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Old 26th Aug 2018, 12:37 am   #2
k_yller
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Default Re: HT power supply (in progress)

Design based on dimension taken from components from drawer and drawings from internet , but when i get main component (transformer) I found that connectors looks much different then on catalog drawings and require much more space.
Anyway finally I can design PCB
PCB contain
voltage multiplier for EF80 heater , support 5V PSU for HT meters & cooling fan (LM317), Grid PSU.
LR8 in SMD version because of power dissipation capability, in standard application with 200K log potentiometer. 200K cover range to 100+ volts , logarytmic gives higher precison in low voltage range. Of course the best will be multiturn but I have to buy it.
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Old 27th Aug 2018, 6:15 pm   #3
k_yller
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Default Re: HT power supply (in progress)

Main parts fitted
front , bottom, top
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Old 29th Aug 2018, 6:45 am   #4
Diabolical Artificer
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Default Re: HT power supply (in progress)

Nice work, any chance of some schematics?

Andy.
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Old 31st Aug 2018, 10:17 pm   #5
k_yller
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Default Re: HT power supply (in progress)

I will publish schematic with description after final tests.
Right now after manufacturing temporary front panel I run tests of HT part.
(And like usually in such a cases you get bright new ideas how something can be done better or how project can be developed to higher level )
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Old 7th Sep 2018, 9:21 pm   #6
k_yller
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Default Re: HT power supply (in progress)

ready (with temporary panel)
HT output -fused
Heater output - fused
Grid output - use internal LR8 protection
unfortunetelly chinese meters are unreliable, can't be properly calibrated in full range
diagram soon
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Old 9th Sep 2018, 10:04 pm   #7
k_yller
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Default Re: HT power supply (in progress)

As promised-circuit,
if anybody interesting I can try explain how to calculate it it for different input/output voltage
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Old 13th Sep 2018, 3:10 pm   #8
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Default Re: HT power supply (in progress)

Thanks.
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Old 14th Sep 2018, 7:59 am   #9
daviddeakin
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Default Re: HT power supply (in progress)

What happens if you short the output? Does it survive?
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Old 14th Sep 2018, 7:53 pm   #10
Skywave
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Arrow Re: HT power supply (in progress)

Hmm: well the two PL504 valves will get very hot, that's for sure! I'd fit a fast-acting fuse between the HT O/P and the front panel connector. Simply choose a fuse of appropriate rating. And it might be a good idea to fit an 'HT on/off' switch too. I'd also not connect the 0 v. terminal to ground / chassis - better to leave it floating. (Your cct. diag. shows that 0v. at ground / chassis). Your photo shows that you already have an 0v. / earth terminal for when you definitely do want that 0v. at earth / chassis potential.

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Old 21st Sep 2018, 9:17 pm   #11
k_yller
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Default Re: HT power supply (in progress)

Hi
output is fused
diagram with mistake
"0" on front panel is a middle tap of 6.3 V
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