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Power Supply Question

Started by skypn, October 16, 2021, 06:06:28 PM

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skypn

Consider this schematic:

I have seen the same PS, but only R1 is placed after D1. Is there a difference?
TIA
Knowledge for Knowledge's Sake

skypn

And also, what type should C2 be? MLCC, or film?
Knowledge for Knowledge's Sake

Zerro

Order of R and D is not important. 100nF capacitors in power supplies are better ceramic, here for minimally 12V but better for 25V.
"Nudíte se? Kupte si našeho cvičeného ježka! Pobaví vás svými veselýmí kousky!"

jimilee

Quote from: Zerro on October 16, 2021, 07:10:34 PM
Order of R and D is not important. 100nF capacitors in power supplies are better ceramic, here for minimally 12V but better for 25V.

Ceramic, not metal film or even mlcc? Don't see to many people using ceramic values above 1000pf. For pedals anyway.
Pedal building is like the opposite of sex.  All the fun stuff happens before you get in the box.

jimilee

Quote from: skypn on October 16, 2021, 06:06:28 PM
Consider this schematic:

I have seen the same PS, but only R1 is placed after D1. Is there a difference?
TIA

While the order doesn't matter, I'm not sure why anything would be placed before the protection diode. Just a preference, I suppose. I will typically use metal film in the power section.
Pedal building is like the opposite of sex.  All the fun stuff happens before you get in the box.

Zerro

#5
I use ceramic multilayer. The lowest ESR and ESL, tiny size, high current peak. Not so depending at temperatures. Class1 as so class2. It worths to invest to it.
"Nudíte se? Kupte si našeho cvičeného ježka! Pobaví vás svými veselýmí kousky!"