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Old 29th April 2013, 06:49 AM   #8861
dvv is offline dvv  Serbia
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Thank you, Brad.

It's a sad day when you have to wait to work for years, anywhere, anytime.

If you're a parent, you can imagine how big a load is off my chest. Ultimately, kids are all we really have.
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Old 29th April 2013, 06:51 AM   #8862
dvv is offline dvv  Serbia
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Has anyone tried making a voltage regulator based on 317/337 regs, but at a higher voltage than their normal maximum of 39 V?

Does the old trick of using a zener to lift the ground work? Any experiences?
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Old 29th April 2013, 08:29 AM   #8863
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Hi DVV . My son also . He has just past a qualification that many use for CSI work . No work yet . I suggested he apply to a brewery he visited . They showed how they maintain yeasts to have a defined taste . He especailly wants to do lab work .

Sid Smith used 317 in the Marantz amps at circa 400 V . One simple way to do it if the load is constant is use 317 as a CCS . If an input resistor is used it can be zener protected for surges ( 37 V zener ? out to in ) .That also substitutes the usual 1N4007 or whatever as a reverse diode . This design is similar . Talking to Sid I suspect he did it first . The 317 has the dynamic range to deal with the typical HT ripple . Speed is OK for a class A amp .

DIY Test Equipment for Audio and Ham Radio Enthusiasts

One thing I did do recently was use a 317 as a constant voltage source out and as a constant current source in . It cheaply solved interfacing a NE 555 timer with a set of relays . No level shifter required using a voltage source which is between 21 and 40 V DC . 12 V relays above and below . A transistor and zener would do equally well ( the emitter as constant voltage source , collector as CCS ) . The advantage being the 317 is as cheap and will always give the same result .
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Old 29th April 2013, 10:03 AM   #8864
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by dvv View Post
Has anyone tried making a voltage regulator based on 317/337 regs, but at a higher voltage than their normal maximum of 39 V?

Does the old trick of using a zener to lift the ground work? Any experiences?
317+led in the adj to ground gives a nice 3V to 3.3V regulator.
Use the out to adj resistor to ensure sufficient pass current for correct operation.
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Old 29th April 2013, 11:08 AM   #8865
dvv is offline dvv  Serbia
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@AndrewT

Andrew, I wanted higher voltage than nominal; lower is always easier to obtain. Specifically, I want to be able to use it for voltages 55...65V, obviously fully regulated, for the power amp input stage and VAS, specifically.

@Nigel

Attaboy Nige, the supplied schematic obviously shows that the ground lift by zener trick still works. Thanks.
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Old 29th April 2013, 12:00 PM   #8866
AndrewT is offline AndrewT  Scotland
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@AndrewT

Andrew, I wanted higher voltage than nominal; lower is always easier to obtain. Specifically, I want to be able to use it for voltages 55...65V, obviously fully regulated, for the power amp input stage and VAS, specifically.
that works as well, The highest I've used is 20V Zener instead of the resistor.
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Old 30th April 2013, 09:01 AM   #8867
mjona is offline mjona  New Zealand
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Quote:
Originally Posted by dvv View Post
Has anyone tried making a voltage regulator based on 317/337 regs, but at a higher voltage than their normal maximum of 39 V?

Does the old trick of using a zener to lift the ground work? Any experiences?
I have built discrete component regulators for power amp output stages but never high voltage ones using LM317 etc.

That said I remember an article for an Ultra Low Distortion Amplifier in the Australian Silicon Chip magazine around 10 or more years ago - that had regulated s.s.stages.

It is not completely out-moded as Altronics still offer offer a full kitset including metalwork for this 100 watt per channel project.

Unfortunately I ditched the issues inwhich this featured - I had no interest in outlaying the capital to buy one.

From memory it used LM317 's in each of the supply rails in combination with an NPN device. I do not remember why they did not use a LM337 in the negative rail.

I think there was a network of zener diodes in parallel with the LM317 and NPN combo to ensure that the voltage presented at switch on did not exceed a safe level.

I thought this worth mentioning as a risk to be avoided.

Anybody in Australia still have these articles?

Michael J.
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Old 5th May 2013, 12:57 PM   #8868
dvv is offline dvv  Serbia
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Happy Easter to all of Christian faith! May you celebrate many Easters yet to come in good health and sound spirit.

To everybody of different faith, such as Jews, Muslims, Buddists and others, Easter is a time of goodwill and good faith, and my heart goes out to you too.
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Old 5th May 2013, 01:23 PM   #8869
fas42 is online now fas42  Australia
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Thank you for your good cheer, dvv - but it was a bit of a surprise, Easter in Australia was at the end of March! I note that there it seems to work to the historical calendar -- quite a difference!

All the best to you and your family,
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Old 5th May 2013, 03:37 PM   #8870
bcarso is offline bcarso  United States
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Orthodox Easter Day in Russia

Rimsky-Korsakov - Russian Easter Festival Overture, Op. 36 (1888), played on period instruments - YouTube

Cheers,

Brad
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