|
Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
|
Thread Tools |
23rd Nov 2014, 12:45 am | #81 |
Dekatron
Join Date: Apr 2009
Location: Oxfordshire, UK.
Posts: 4,935
|
Re: Variable HT regulator circuit.
Working well now. Referring back to my earlier comments about "soft starts" with psu's using silicon diodes, what I've found is that by putting a 10uF electrolytic cap in parallel with C3, the output volts comes up quite slowly, taking about 10-15 seconds to reach working value and that could obviously extended if you wanted to with a larger cap. So apart from working well as a regulated HT supply, this circuit is a fine way of harmonising silicon rectifiers with vintage valve gear. My HRO, with its new solid-state psu, will love it .
B
__________________
Saturn V had 6 million pounds of fuel. It would take thirty thousand strong men to lift it an inch. Last edited by AC/HL; 23rd Nov 2014 at 1:18 pm. Reason: As requested |
23rd Nov 2014, 12:50 am | #82 |
Dekatron
Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
|
Re: Variable HT regulator circuit.
So the opto-isolator output is actually a voltage source that turns on the FET?
I think I might have to investigate these devices, for something I am thinking of building, as it could potentially save me from having to add an overwinding to a power transformer ..... It would only be a few turns, and easily poked in around the bobbin, but a way of doing it without a separate gate drive supply looks interesting.
__________________
If I have seen further than others, it is because I was standing on a pile of failed experiments. |
23rd Nov 2014, 12:58 am | #83 |
Dekatron
Join Date: Apr 2009
Location: Oxfordshire, UK.
Posts: 4,935
|
Re: Variable HT regulator circuit.
@ajs - just to be clear, the delay function I refer to is with the regulator circuit in post #46; I've not yet explored the opto-isolator circuit.
B
__________________
Saturn V had 6 million pounds of fuel. It would take thirty thousand strong men to lift it an inch. |
23rd Nov 2014, 1:48 pm | #84 | |
Dekatron
Join Date: Nov 2006
Location: London, UK.
Posts: 3,496
|
Re: Variable HT regulator circuit.
Quote:
(As i say, both devices in the 8DIP device need to be in series, only one shown for simplicity), Yours is an interestîng application , keep us posted
__________________
Al |
|
25th Nov 2014, 2:33 am | #85 |
Dekatron
Join Date: Apr 2009
Location: Oxfordshire, UK.
Posts: 4,935
|
Re: Variable HT regulator circuit.
Following great public demand (!), I've uploaded the Veroboard layout I used for the HT regulator. In the process of conversion from Freelance to JPEG, the tracks have come out oddly both in grey and yellow; just ignore .
I actually omitted C1 as I added the regulator to an existing psu, but I've included C1 in outline. I've just designated the zener string as 'Zs' (I used 3x 100V, Jim used 5x 47 V) Hope the upload is usable; let me know if any issues. B
__________________
Saturn V had 6 million pounds of fuel. It would take thirty thousand strong men to lift it an inch. |
25th Nov 2014, 10:58 am | #86 |
Heptode
Join Date: Nov 2004
Location: Ripon, N.Yorkshire, UK.
Posts: 782
|
Re: Variable HT regulator circuit.
That's great Bazz. As you say C1 isn't really necessary if you're using this as an add-on.
Jim |
25th Nov 2014, 5:16 pm | #87 | |
Hexode
Join Date: Apr 2007
Location: W Yorks, UK.
Posts: 407
|
Re: Variable HT regulator circuit.
Quote:
https://code.google.com/p/diy-layout-creator/ |
|