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Modulus-86  build thread
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Old 8th July 2017, 10:34 PM   #3551
tomchr is offline tomchr  Canada
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A pillar drill (aka drill press) is worth every penny. Mine is a relatively inexpensive JET JDP-12. Works great.

Tom
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Old 8th July 2017, 10:39 PM   #3552
billshurv is offline billshurv  United Kingdom
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Modulus-86  build thread
Mine is one of those nasty ones that you put your own drill into. I never used one I bought 20 years ago as always worked somewhere that had a proper pillar drill. This one will have to do for now. When I finally move I must have a garage/workshop.
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Old 9th July 2017, 07:35 PM   #3553
AlexQS is offline AlexQS  United States
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I know what you mean Bill about being busy. It's too bad that with computers I can do work for my employer from home, as I worked both Saturday and Sunday. At least Monday will be an easier day for it when I go to the office, but another weekend has passed with no progress made on the amp.

By the way,.. I didn't get a chance to congratulate you on the new born, so "Congrats!"
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Old 9th July 2017, 07:42 PM   #3554
billshurv is offline billshurv  United Kingdom
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Thank you. It's sad that I can produce offspring faster than I can make a case for an amp, but there you go
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Old 9th July 2017, 07:57 PM   #3555
nycavsr2000 is offline nycavsr2000  United States
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Modulus-86  build thread
Quote:
Originally Posted by billshurv View Post
Thank you. It's sad that I can produce offspring faster than I can make a case for an amp, but there you go
Producing offspring is far more fun. Raising them is a different story. I can only imagine the lifestyles of the kings & queens of yore! My wife and I are currently entertained by a US production series named "Reign" - a story of the Queen Mary of Scots...

Sorry for the off topic...back to season 4!

Best,
Anand.
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Old 11th July 2017, 12:01 PM   #3556
soongsc is offline soongsc  Taiwan
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Volly ball team to baseball team up to ...


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Old 17th July 2017, 02:20 AM   #3557
454Casull is offline 454Casull  Canada
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Originally Posted by tomchr View Post
Every SMPS I've built and all I've seen schematics of, including the Connex Electronic supplies, have been regulated. They have a feedback loop from the output back to the switching regulator IC. That's the definition of a regulated supply right there.

Tom
Connexelectronic

This one says it's unregulated? Or am I interpreting incorrectly?
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Old 17th July 2017, 05:28 AM   #3558
tomchr is offline tomchr  Canada
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I guess you found one that isn't regulated.

Looking at the market a bit closer it appears that some SMPSes for audio use are essentially transformer emulators. It looks like they're running at a constant duty cycle, so the output voltage is a fixed ratio of the input voltage. If the input mains voltage varies, so does the output voltage. Hypex's supplies are like that (at least the ones I've looked at). I'm not really sure why. Implementing a feedback loop would take a few more components and result in a fixed output voltage, lower output impedance, etc. Not much additional cost for a lot of advantages.

The Connex Electronic supplies I recommend for the MOD86 and MOD286 are the SMPS300RE and the SMPS500R. I've tested both the '86 and '286 with the SMPS300RE. I have not tested with the SMPS500R as I don't currently own one.

Tom
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Modulus-86: 40W/8Ω @ 0.000061% THD. HP-1: 3W/20Ω, 450mW/300Ω @ 0.000032% THD. DG300B and Other Tube Circuits.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 17th July 2017, 07:25 AM   #3559
vacuphile is offline vacuphile  Netherlands
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Quote:
Originally Posted by tomchr View Post
Every SMPS I've built and all I've seen schematics of, including the Connex Electronic supplies, have been regulated.

Tom


Hypex works with unregulated power supplies.
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Old 17th July 2017, 04:12 PM   #3560
tomchr is offline tomchr  Canada
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Quote:
Originally Posted by vacuphile View Post
Hypex works with unregulated power supplies.
Please see my post just above yours. Post #3558.

Tom
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Modulus-86: 40W/8Ω @ 0.000061% THD. HP-1: 3W/20Ω, 450mW/300Ω @ 0.000032% THD. DG300B and Other Tube Circuits.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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