Hi, thanks for join the group.

I have a DDDac1543 from Doede Douma.

It use one LM317T on the PCB for the 8V+.
Output leg 2 has an100nF decoupling / bypass capacitor to ground to take the high frequency. Adjust leg 1 has also a 100nF capacitor to ground.
I know someone has put a 2200uF capacitor in paralell with the 100nF after output leg.
Also read that use a value one decade bigger, 1.0uF + 100nF. Or 22uF + 100nF. If so that it is an improvement to put a bigger capacitor together with the 100nF, do the same with the 100nF capacitor from the adjust leg also. What do you think. Frank

 

I normally add anything from 10uf to 100uf on the output to help with the transients.

I see no need for 2200uf, and if you did go that large be sure to use the protection diode.

 

Welcome to AAC!

A linear voltage regulator is an analog servo control system.
The capacitor on the output will control the feedback time-constant and will affect the servo's ability to maintain a constant voltage effectively.

Use the input and output capacitances recommended by the device manufacturer.
A 0.1μF ceramic capacitor and a 10μF electrolytic capacitor is all you should need on the output side.