UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Other Discussions > Homebrew Equipment

Notices

Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members.

Closed Thread
 
Thread Tools
Old 23rd Aug 2018, 10:02 pm   #1
k_yller
Pentode
 
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 129
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
Attached Thumbnails
Click image for larger version

Name:	proj1.jpg
Views:	215
Size:	97.4 KB
ID:	167986   Click image for larger version

Name:	chassis1.jpg
Views:	188
Size:	56.5 KB
ID:	167987   Click image for larger version

Name:	chassis01.jpg
Views:	192
Size:	74.0 KB
ID:	167988  
k_yller is offline  
Old 26th Aug 2018, 12:37 am   #2
k_yller
Pentode
 
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 129
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.
Attached Thumbnails
Click image for larger version

Name:	pcb4.jpg
Views:	153
Size:	41.6 KB
ID:	168090   Click image for larger version

Name:	pcb5.jpg
Views:	139
Size:	38.4 KB
ID:	168091   Click image for larger version

Name:	pcb2.jpg
Views:	152
Size:	39.2 KB
ID:	168092   Click image for larger version

Name:	pcb6.jpg
Views:	159
Size:	75.5 KB
ID:	168093   Click image for larger version

Name:	pcb8.jpg
Views:	191
Size:	75.3 KB
ID:	168094  

k_yller is offline  
Old 27th Aug 2018, 6:15 pm   #3
k_yller
Pentode
 
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 129
Default Re: HT power supply (in progress)

Main parts fitted
front , bottom, top
Attached Thumbnails
Click image for larger version

Name:	psu2.jpg
Views:	225
Size:	75.7 KB
ID:	168199   Click image for larger version

Name:	psu3.jpg
Views:	221
Size:	92.8 KB
ID:	168200   Click image for larger version

Name:	psu4.jpg
Views:	210
Size:	93.2 KB
ID:	168201  
k_yller is offline  
Old 29th Aug 2018, 6:45 am   #4
Diabolical Artificer
Dekatron
 
Diabolical Artificer's Avatar
 
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 7,639
Default Re: HT power supply (in progress)

Nice work, any chance of some schematics?

Andy.
__________________
Curiosity hasn't killed this cat...so far.
Diabolical Artificer is offline  
Old 31st Aug 2018, 10:17 pm   #5
k_yller
Pentode
 
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 129
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 )
Attached Thumbnails
Click image for larger version

Name:	frontpanel.jpg
Views:	173
Size:	33.7 KB
ID:	168460   Click image for larger version

Name:	psu5.jpg
Views:	185
Size:	97.4 KB
ID:	168461   Click image for larger version

Name:	psu6.jpg
Views:	151
Size:	86.4 KB
ID:	168462  
k_yller is offline  
Old 7th Sep 2018, 9:21 pm   #6
k_yller
Pentode
 
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 129
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
Attached Thumbnails
Click image for larger version

Name:	psu10.jpg
Views:	163
Size:	77.9 KB
ID:	168923   Click image for larger version

Name:	psu11.jpg
Views:	115
Size:	76.7 KB
ID:	168924  
k_yller is offline  
Old 9th Sep 2018, 10:04 pm   #7
k_yller
Pentode
 
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 129
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
Attached Thumbnails
Click image for larger version

Name:	diagram.jpg
Views:	249
Size:	40.6 KB
ID:	169030  
k_yller is offline  
Old 13th Sep 2018, 3:10 pm   #8
Diabolical Artificer
Dekatron
 
Diabolical Artificer's Avatar
 
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 7,639
Default Re: HT power supply (in progress)

Thanks.
__________________
Curiosity hasn't killed this cat...so far.
Diabolical Artificer is offline  
Old 14th Sep 2018, 7:59 am   #9
daviddeakin
Hexode
 
daviddeakin's Avatar
 
Join Date: Apr 2007
Location: W Yorks, UK.
Posts: 406
Default Re: HT power supply (in progress)

What happens if you short the output? Does it survive?
daviddeakin is offline  
Old 14th Sep 2018, 7:53 pm   #10
Skywave
Rest in Peace
 
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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.

Al.

Last edited by Skywave; 14th Sep 2018 at 8:01 pm.
Skywave is offline  
Old 21st Sep 2018, 9:17 pm   #11
k_yller
Pentode
 
Join Date: Jan 2014
Location: Huddersfield, West Yorkshire, UK.
Posts: 129
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
k_yller is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 1:30 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.