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Old 18th February 2012, 07:41 AM   #681
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I would really like to discuss regulated power supply for Circlophone, especially since the Philips BD140 gets sketchy at higher voltage and is vulnerable to power surges if run unregulated. But that's just an excuse. Regulated power has a different sound, usually a great quality baritone region, and I'd like to try that. Capmulti can do the same, but I don't have an excuse to ask for that.
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Old 18th February 2012, 11:17 PM   #682
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Quote:
Originally Posted by Elvee View Post
I didn't care to make the rest of the modifications, and connected it to a source and speaker: as I write, I am listening to it and everything seems OK
CFP version hasn't zeners in scheme (I don't know why). Were they in place when you testing?
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Old 18th February 2012, 11:30 PM   #683
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The zeners can range from total voltage span (no zeners present) to half of total voltage span (as shown in post 1 and post 658). The difference is apparently heat in one of the drivers. And you want to use the zeners. I guess and predict that he will answer yes, he was using the zeners, as shown in post 1.

What I'm unsure of is the connection of the R18+C12 RC when the zeners are installed (and they should be). It appears that the RC is for assisting the drivers, which is not exactly what the schematic (post 1 and post 658) shows since the RC may be less effective when isolated by those diodes. So, I'd like to add that question. Should the RC go directly between the divers instead, for post 1 and likewise post 658?

Last edited by danielwritesbac; 18th February 2012 at 11:39 PM.
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Old 18th February 2012, 11:47 PM   #684
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Another thing is, I'm not sure that is it safe without D10,D11 and C3 in a real circuit. I want to try CFP version and I'm trying to modify powerlux pcb respecting CFP scheme.
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Old 19th February 2012, 12:56 AM   #685
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Quote:
Originally Posted by danielwritesbac View Post
I would really like to discuss regulated power supply for Circlophone, especially since the Philips BD140 gets sketchy at higher voltage and is vulnerable to power surges if run unregulated. But that's just an excuse. Regulated power has a different sound, usually a great quality baritone region, and I'd like to try that. Capmulti can do the same, but I don't have an excuse to ask for that.
I was investigating how easily one could fudge an undervoltage lockout.
In case one power supply is up, the other not (fuse blown or whatever).
Amazingly, I find circlophone needs none! You can disconnect either
supply from it's rail, and nothing bad happens. Accident of genius?

It also tolerates the case of positive supply shorted to GND.
Does not, however tolerate the negative supply shorted to GND.
What would it take to make that condition safe too, just a diode?
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Old 20th February 2012, 09:13 PM   #686
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Has anyone any idea of possibility of degrade something if using relatively high gain transistors as input pairs in CFP version? Mine are BC560C (~540) and BC550B (~380).

Last edited by terranigma; 20th February 2012 at 09:18 PM.
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Old 21st February 2012, 07:51 AM   #687
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Quote:
Originally Posted by terranigma View Post
Has anyone any idea of possibility of degrade something if using relatively high gain transistors as input pairs in CFP version?
No, that shouldn't cause any problem. It will make the input resistance even higher.
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Old 22nd February 2012, 11:14 PM   #688
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Default Nice power supplies?

I'd like to hear about some deluxe power supply options for both regulated and unregulated power that are really good with Circlophone.

Of course Circlophone does perform well with a really basic power circuit, and although that is true, I am curious about clean power, and I am especially curious about decreasing the harmonic influence of the power supply, by using a clean / higher quality power supply.

Last edited by danielwritesbac; 22nd February 2012 at 11:38 PM.
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Old 23rd February 2012, 11:58 AM   #689
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Quote:
Originally Posted by danielwritesbac View Post
I'd like to hear about some deluxe power supply options for both regulated and unregulated power that are really good with Circlophone.

Of course Circlophone does perform well with a really basic power circuit, and although that is true, I am curious about clean power, and I am especially curious about decreasing the harmonic influence of the power supply, by using a clean / higher quality power supply.
Like most decent amplifiers, the Circlophone needs no regulated power.

At best, a regulated power supply will not change anything, but in most cases (that is particularly applicable to "audiophiliacs" supplies), it will do some harm, because of an uncontrolled output impedance or downright instabilities, like in this example.

I guess this one must seriously "enrich" the harmonic balance of whatever it supplies:
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Old 23rd February 2012, 02:37 PM   #690
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If the amplifier is dead quiet at idle, prevented from clipping,
drives all stages entirely by high impedance currents rather
than low impedance voltages: When would it be interacting
with reasonable amounts of low frequency power supply ripple?

This is painting "enable" dots on the edge of a CD. The last
resort of someone with far too much time on their hands.

I see a lot of "simple" amplifiers that want 4 or more complex
supplies of absurd cleanliness. I don't perceive any advantage
designing amplifiers to lean upon a crutch of such requirement.

Last edited by kenpeter; 23rd February 2012 at 02:47 PM.
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