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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Simple High Performance DC Coupled Class A HPA with sub PPM THD
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Old 9th January 2019, 04:16 AM   #331
yourownbuzz is offline yourownbuzz  Australia
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from post #140 - this one : DKE15B-24 MEAN WELL | Mouser Australia
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Old 9th January 2019, 06:21 AM   #332
yourownbuzz is offline yourownbuzz  Australia
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Here are some pictures of my power supply board.
Regs are socketed - testing with 7818 and 7918 at the moment.
Getting 16V on +ve & -17V after reg & cap mx.

I've forgotten - what was the output voltages we are aiming for after cap mx? (once the adjustable LDOVR regs are in place)
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Old 9th January 2019, 11:46 AM   #333
xrk971 is online now xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
+/-18v
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Old 9th January 2019, 12:58 PM   #334
yourownbuzz is offline yourownbuzz  Australia
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How would that be achieved on the neg rail? (the LDOVR negative reg is max of -18V meaning final output will be -18 less cap mx drop?)

TPS7A3301 Ultra Low Noise LDO Voltage Regulator

Features
Ultra Low Noise Voltage Regulator
-3V – -18.3V (1V step) 1A
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Old 9th January 2019, 04:21 PM   #335
xrk971 is online now xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
LDOVR.com doesn't make an adjustable negative output one - you can reprogram yourself by changing the resistors. Or get the eBay made in China version with a pot. Here is an example of one (but not in TO220 format).

TPS7A3301 1A -1.18V~-33V Adjustable Low Noise Negative Linear Power Supply Board 699986551561 | eBay

I just came across this dual rail regulator (programmable via DIP switches):
TPS7A4701 TPS7A3301 Low Ripple Positive Negative Linear Power Supply Module 1A | eBay
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Old 9th January 2019, 08:49 PM   #336
oxothuk is offline oxothuk  United Arab Emirates
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Quote:
Originally Posted by xrk971 View Post
LDOVR.com doesn't make an adjustable negative
adjustable pot - very bad idea for the voltage reference circuit, specially for low noise application, TPS7A3301 can be shipped with 3-21V configurable version (with 1V step), BUT MAX INPUT 25VDC
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Old 10th January 2019, 12:20 AM   #337
yourownbuzz is offline yourownbuzz  Australia
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I did order and receive an adjustable neg reg from ldovr , up to -18V as on their website - voltages set by pads.
Which resistors have to be changed to allow higher output voltages?
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Old 10th January 2019, 06:12 AM   #338
oxothuk is offline oxothuk  United Arab Emirates
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Quote:
Originally Posted by yourownbuzz View Post
I did order and receive an adjustable neg reg from ldovr , up to -18V as on their website - voltages set by pads.
Which resistors have to be changed to allow higher output voltages?
replace R7 (1M5 resistor @ top right corner - 0.3V pad) with 105K (SMD 0603)
after modification 0.3V PAD will add 4V - you can configure from 3V to 22V with 1V step

for 20V - need to solder 8V, 4V, 1V and 0.3V (now 4V) pads
Vout = 3+8+4+1+4 =20V
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Old 10th January 2019, 01:11 PM   #339
yourownbuzz is offline yourownbuzz  Australia
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thanks - will order the resistor and give it a shot!
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Old 11th January 2019, 01:00 PM   #340
yourownbuzz is offline yourownbuzz  Australia
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X - the programmable dual rail supply is only programmable on the positive rail .. neg is fixed -5V
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