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23rd Aug 2018, 10:02 pm | #1 |
Pentode
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 129
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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 |
26th Aug 2018, 12:37 am | #2 |
Pentode
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 129
|
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. |
27th Aug 2018, 6:15 pm | #3 |
Pentode
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 129
|
Re: HT power supply (in progress)
Main parts fitted
front , bottom, top |
29th Aug 2018, 6:45 am | #4 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 7,658
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Re: HT power supply (in progress)
Nice work, any chance of some schematics?
Andy.
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Curiosity hasn't killed this cat...so far. |
31st Aug 2018, 10:17 pm | #5 |
Pentode
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 129
|
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 ) |
7th Sep 2018, 9:21 pm | #6 |
Pentode
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 129
|
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 |
9th Sep 2018, 10:04 pm | #7 |
Pentode
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 129
|
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 |
13th Sep 2018, 3:10 pm | #8 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 7,658
|
Re: HT power supply (in progress)
Thanks.
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Curiosity hasn't killed this cat...so far. |
14th Sep 2018, 7:59 am | #9 |
Hexode
Join Date: Apr 2007
Location: W Yorks, UK.
Posts: 407
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Re: HT power supply (in progress)
What happens if you short the output? Does it survive?
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14th Sep 2018, 7:53 pm | #10 |
Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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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.
Al. Last edited by Skywave; 14th Sep 2018 at 8:01 pm. |
21st Sep 2018, 9:17 pm | #11 |
Pentode
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 129
|
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 |