Author Topic: Blowtorch voltage regulators?  (Read 3320 times)

Gen. Dreedle

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Blowtorch voltage regulators?
« on: June 23, 2010, 01:09:34 PM »
I forget who sent these to me. Might have been Elso. Somehow, I think they come from some Levinson preamp, and not the Blowtorch preamp.

Anyway, it seems to have the handiwork of Phred, all over it.

Beau de Plotz.................oy vey!

Feh.

Jocko
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seagreen

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Re: Blowtorch voltage regulators?
« Reply #1 on: June 23, 2010, 02:32:01 PM »
What type of diode is D1, D2, and D3?  Schottky?  Regular silicon?  Or are they those special germanium types you've mentioned previously?

Do the transistors need to be matched in some way?
No double blind testing was used in the making of this post.

Gen. Dreedle

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Re: Blowtorch voltage regulators?
« Reply #2 on: June 23, 2010, 02:36:13 PM »
I dunno..........maybe those expensive silicon carbide ones.

When did matching ever hurt?

Jocko
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"Danby. D-A-N-B-Y."
"Take him out and shoot him."
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tommy_t

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Re: Blowtorch voltage regulators?
« Reply #3 on: June 23, 2010, 02:43:51 PM »
Anyone know the values of R1 and R2?  Also, it seems odd with the two different unregulated input voltages.  Or are they actually regulated and the schematics for those posted elsewhere?

Gen. Dreedle

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Re: Blowtorch voltage regulators?
« Reply #4 on: June 24, 2010, 08:53:08 AM »
Never noticed that. No values for R1/R2. I bet the different voltages had something to do with one being a slightly regulated version of the first.

Now that I look at it in more detail, I think it would be easier to understand if it was drawn differently. I may do that, in my spare time.

Having said that................the reason for 2 rails may have something to do with the current drop across the 2.7 ohm resistors. If this really is from a Blowtorch preamp, then it probably drew a ton of current. May have required R4/R5 to be too large for it to work properly.

Anyway, I will run this schematic by John Curl, next time I talk to him. He may have seen it before. You know............in one of those many alleged Blowtorch preamp schematics that are floating around.

Jocko
"Major Danby, sir."
"Danby. D-A-N-B-Y."
"Take him out and shoot him."
"Sir?"
"I said take him out and shoot him. Can't you hear?"

zinsula

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Re: Blowtorch voltage regulators?
« Reply #5 on: June 24, 2010, 02:32:39 PM »
Anyone know the values of R1 and R2?  Also, it seems odd with the two different unregulated input voltages.  Or are they actually regulated and the schematics for those posted elsewhere?

Hmmm, could be that those are the rail voltage(s) and the output of this sophisticated reg is the ref voltage for the cascodes?


mrjam

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Re: Blowtorch voltage regulators?
« Reply #6 on: June 28, 2010, 01:36:12 AM »
The attacked regulators are an improved version by Jocko of the second stage of the CTC power supplies.

They're followed by the the single FET regulators that feed the various sections of the preamp, the schematic of the complete psu is attached in another thread of this section.

Gen. Dreedle

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Attacked regulators?
« Reply #7 on: June 28, 2010, 06:27:05 AM »
Who attacked the regulators? Were they damaged?

Jocko
"Major Danby, sir."
"Danby. D-A-N-B-Y."
"Take him out and shoot him."
"Sir?"
"I said take him out and shoot him. Can't you hear?"