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Old 31st December 2018, 01:30 PM   #1601
polsol is offline polsol  South Africa
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Yes I have the schematic, just thought there might be something beyond my understanding as they weren't selected from the E24 series.
Thanks for the clarification Jan and best wishes for 2019.
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Old 31st December 2018, 01:42 PM   #1602
jan.didden is offline jan.didden  Europe
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I selected them because I had them in my bin ;-)
+/-20% on each should be fine, any direction.
The two resistors in the feedback divider are important of course (their ratio is) as it sets Vout.

Best wishes for you all as well!

Jan
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Old 1st January 2019, 10:50 AM   #1603
polsol is offline polsol  South Africa
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A further few questions if I may:

What is the preferred input to output voltage 'overhead'?
For example, what is the required input voltage to get a required output of say 15V?

Would the regulator be compromised if it was fed an existing DC voltage emanating from a 'Smoothed' DC voltage from a LM317 voltage regulator (from a separate enclosure/box)?

TIA
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Old 1st January 2019, 11:46 AM   #1604
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by polsol View Post
A further few questions if I may:

What is the preferred input to output voltage 'overhead'?
For example, what is the required input voltage to get a required output of say 15V?

Would the regulator be compromised if it was fed an existing DC voltage emanating from a 'Smoothed' DC voltage from a LM317 voltage regulator (from a separate enclosure/box)?

TIA
You must consider the level of ripple on the input voltage. Make sure that the minimum input value (the 'through') of the ripple leaves enough voltage for the regulator to work, lets say minimum 1V.
Remember that mains voltage can vary 10% so if you set the headroom too low, it may drop out of regulation at low mains.

On the other hand, if you have too much headroom, it will heat up the regulator unnecessarily. For instance, with an output current of 150mA and a headroom of 5V the pass device will dissipate 0.15 x 5 = 750mW, which is OK. With 0.5A and 15V headroom it is 7.5W which you probably don't want!

If you feed the reg with smoothed voltage there is much less variation and ripple so you can set the dropout a bit tighter.

In all these cases you must do some experiments and measurements on several times of the day if you use non-stabilised input voltage.

Jan
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Old 13th January 2019, 03:51 PM   #1605
powermike145 is offline powermike145  United States
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I'm using an old rectifier from a previous project to supply the SR. I'm getting +20.3V and -20.3V from it and into the SR. My SR outputs are good individually; I'm getting 12.14V (between +Vout and +return) and -12.18V (between -Vout and -return) but there's 16.2V between the +return and -return. That's not good since I'm trying to use the SR in a +12V,0,-12V application. I measured the voltage between the +GND and -GND from the rectifier output and am getting 16.2V as well.


Is this the problem? I need a rectifier that supplies the SR with +return and -return inputs that are at the same potential in order to get my SR return outputs at the same potential (0V referenced between +Vout and -Vout)?
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Old 13th January 2019, 06:10 PM   #1606
jan.didden is offline jan.didden  Europe
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Well you need to interconnect the two supplies at one point, to get +/-12V, right? If you connect +return and -return and call it 'ground' you have +12, gnd and -12.

You did supply each regulator from an isolated secondary on the xformer? If you have only one xformer/rectifier this won't work of course.
See the drawings in my article on the diyaudio store. I spend a lot of time to make this as clear as possible. Please read it.

Jan
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Old 13th January 2019, 07:46 PM   #1607
powermike145 is offline powermike145  United States
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Mr. Didden, thanks for the quick response. Of course, I'm a moron. I had the secondaries connected in parallel. I disconnected those and was able to jumper the SR return outputs to get my 0V reference. All is good now. Thanks for setting me straight!
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Old 13th January 2019, 08:03 PM   #1608
jan.didden is offline jan.didden  Europe
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