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RE: Looks like I have too build myself a second voltage regulator. This time a 5 Volt one.

Hi Mark!
Here is the standard schematic of the stabilized power supply unit.



The explanatory notes to schematics:
1. TV1 – the power transformer
2. VD – the Schottky rectifiers
3. C1 and C2 – the filtering capacitors, C3 and C4 – output capacitors
4. С2 and С4 - the qualitative film capacitors with small capacity (for example Wima) shunting electrolytic capacitors for filtering HF noise (the film capacitor capacity is around 1/100 part of the electrolytic capacitor capacity). С2 and С4 are possible not to install in case of use of electrolytic capacitors Black Gate, Elna Cerafine, Elna Silmic, Panasonic FC and similar.
5. R1 – the load resistor providing the minimum load current (5-10 mA) in the psu’s output.
6. U1 – the regulator.

In your case:
the filtering capacitor capacity (C1) should be not less than 4700 µF and C3 should be not less than 470 µF approximately. Oscon does not approach here.
R1=500-1000 Ohm


Serge.
http://cmp2-mihaylov.narod.ru/

My cMP2: Windows XP SP2 Ru, GA-H55M-UD2H, i3-530, Corsair CM3X160C9DHX 1GB, system drive - Transcend IDE FLASH MODULE TS2GDOM40V-S FAT32, ESI Juli@, full linear PSU, NAS - WD My Book Live


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