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Linear power supply - two windings or linear voltage regulator
Linear power supply - two windings or linear voltage regulator
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Old 20th October 2019, 12:00 PM   #21
jean-paul is offline jean-paul  Netherlands
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Stretchneck needs more than 1A output current....
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Old 20th October 2019, 12:36 PM   #22
stretchneck is offline stretchneck  United Kingdom
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Quote:
Originally Posted by jean-paul View Post
Stretchneck needs more than 1A output current....
Thanks - Iíve rechecked the JCAT Femto USB spec and it only needs 5v 1A. So this might work be a great suggestion!
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Old 20th October 2019, 01:02 PM   #23
jean-paul is offline jean-paul  Netherlands
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Ok these work OK too:

Low Noise LT3042 Linear Regulator Power Supply Board For Amanero XMOS DAC Power | eBay

Cheap, low noise but not short circuit proof. They work Ok with a 7V transformer like the toroid series Talema produces. They have 1.5V dropout because of the PNP pass transistor.
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Old 21st October 2019, 04:41 PM   #24
randytsuch is offline randytsuch
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A bit I left out in my initial post was that the 78S05 feeds a pair of 2.7V, 360F ultracaps (or supercaps). I'm depending on the caps to take care of any noise from the 78S05 stage.
If I can get away with less than 2A (I think I can but need to measure), then I may try a lower noise reg and see if it makes a difference.
I've started to use PS's based on these huge caps so I can get away with using a simple regulator, vs a superreg.

A drawback to these caps is you have to worry about heat and current draw while charging the caps up. I mounted my 78S05 on a decent size heat sink, and was using a fan to blow air on the heatsink while the cap charged.

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