Search found 10 matches

by jgrg1
Sat Oct 15, 2011 8:11 pm
Forum: Technical Discussion
Topic: HV Maida Regulators...
Replies: 3
Views: 1537

Re: HV Maida Regulators...

Is there an english translation?
by jgrg1
Sat Oct 15, 2011 7:55 pm
Forum: Technical Discussion
Topic: HV Maida Regulators...
Replies: 3
Views: 1537

HV Maida Regulators...

Hi, I'm in the design phase of building a new guitar valve amp, and I'm looking at regulating the HT using a Maida regulator. My requirements are 400V DC @ 200mA as I plan to use it to supply HT to the entire amp (yes, I know the PP rejects common-mode noise, but if I have a well-regulated HT, why n...
by jgrg1
Tue Oct 04, 2011 11:07 pm
Forum: Technical Discussion
Topic: Elevated 6.3V AC supply with 6.3V DC regulated supply?
Replies: 32
Views: 10995

Re: Elevated 6.3V AC supply with 6.3V DC regulated supply?

After all that, having checked the power transformer, it looks like I won't have enough juice to power the 2xEL34s + 4xECC83 (and relays) anyway, so I'm going to install a second power transformer to get 12.6v DC for the preamp tubes. I planned to DC elevate the 6.3v heaters anyway, but just out of ...
by jgrg1
Sun Oct 02, 2011 3:13 pm
Forum: Technical Discussion
Topic: Elevated 6.3V AC supply with 6.3V DC regulated supply?
Replies: 32
Views: 10995

Re: Elevated 6.3V AC supply with 6.3V DC regulated supply?

Apologies to resurrect this, I've just started looking at it all again. With the SPX29302/MIC29302 LDO regulators, what values of R1/R2 did you use. The equation specified in the datasheets is: Vout = 1.24 * (1 + R1 / R2) The example in the datasheet uses R1 = 158k. Is this a sensible value? There i...
by jgrg1
Wed May 05, 2010 11:47 am
Forum: Technical Discussion
Topic: Elevated 6.3V AC supply with 6.3V DC regulated supply?
Replies: 32
Views: 10995

Re: Elevated 6.3V AC supply with 6.3V DC regulated supply?

So with the raised 6.3V DC levels in Jana's diagram, would it be possible to feed these into a LDO voltage regulator? So instead of tying the regulator to ground, it's tied to the -ve line on the right of the diagram where it says "DC Heaters"? Also, so why would you not tie the elevated DC to the c...
by jgrg1
Thu Apr 29, 2010 3:46 pm
Forum: Technical Discussion
Topic: Elevated 6.3V AC supply with 6.3V DC regulated supply?
Replies: 32
Views: 10995

Re: Elevated 6.3V AC supply with 6.3V DC regulated supply?

Interesting stuff! Thanks for all your help. Was thinking about implementing a slow-start circuit into it as well.
by jgrg1
Thu Apr 29, 2010 12:35 pm
Forum: Technical Discussion
Topic: Elevated 6.3V AC supply with 6.3V DC regulated supply?
Replies: 32
Views: 10995

Re: Elevated 6.3V AC supply with 6.3V DC regulated supply?

Hi Paulster, do you have a list of components that you used and a schematic?
by jgrg1
Thu Apr 29, 2010 12:32 pm
Forum: Technical Discussion
Topic: Elevated 6.3V AC supply with 6.3V DC regulated supply?
Replies: 32
Views: 10995

Re: Elevated 6.3V AC supply with 6.3V DC regulated supply?

Hi, do you know if it works?
by jgrg1
Thu Apr 29, 2010 9:18 am
Forum: Technical Discussion
Topic: Elevated 6.3V AC supply with 6.3V DC regulated supply?
Replies: 32
Views: 10995

Re: Elevated 6.3V AC supply with 6.3V DC regulated supply?

Ah, I thought I was being stupid. Still, you have to ask. So the only difference really is that I ditch the centre-tap on the transformer winding.

Awesome stuff, thanks all. I could just as easily power the power amp valves with 6.3V DC as well?
by jgrg1
Wed Apr 28, 2010 10:53 pm
Forum: Technical Discussion
Topic: Elevated 6.3V AC supply with 6.3V DC regulated supply?
Replies: 32
Views: 10995

Elevated 6.3V AC supply with 6.3V DC regulated supply?

Hi, I've got a question for people more knowledgeable than I regarding tube heater power supplies. I'm looking to power the preamp valves with 6.3V DC, and the power valves with DC elevated 6.3V AC. Is this possible from a single 6.3VAC centre-tapped transformer winding - as shown in the attached im...