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Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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#1 |
Pentode
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 110
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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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#2 |
Pentode
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 110
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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
![]() 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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#3 |
Pentode
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 110
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Main parts fitted
front , bottom, top |
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#4 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 3,980
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Nice work, any chance of some schematics?
Andy.
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Curiosity hasn't killed this cat...so far. |
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#5 |
Pentode
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 110
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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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#6 |
Pentode
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 110
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ready
![]() 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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#7 |
Pentode
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 110
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As promised-circuit,
if anybody interesting I can try explain how to calculate it it for different input/output voltage |
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#8 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 3,980
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Thanks.
__________________
Curiosity hasn't killed this cat...so far. |
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#9 |
Hexode
Join Date: Apr 2007
Location: Lancashire, UK.
Posts: 295
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What happens if you short the output? Does it survive?
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#10 |
Dekatron
Join Date: Jun 2006
Location: Chard, south Somerset, UK.
Posts: 6,133
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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.
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"Your idea is crazy! But the question is this: is it crazy enough . . . . to be true?" (Niels Bohr) Last edited by Skywave; 14th Sep 2018 at 8:01 pm. |
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#11 |
Pentode
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 110
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Hi
output is fused diagram with mistake ![]() "0" on front panel is a middle tap of 6.3 V |
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