I'm building my 5 V circuitry for my bike's dynamo rated 3 W 6 V.
Today I went for testing peak voltages without load and capacitors, just with diode bridge 4 x 1N5819.
Unfortunately my multimeter doesn't have peak function, so I made peak detector from LM324N:
Capacitor used: 100 nF ceramic. Meter leads were connected to Vout and GND pin of LM324N. Maximum readings were 24 V at maximum speed I could do.
I tested this peak detector on my ATX PSU (bridge rectifier omitted), I got:
real 5V -> Vout = 3.9 + 0.1V (Vdrop of 1N5819) = 4V, delta = 1V real 11.1V -> Vout = 9.8 + 0.1V = 9.9V, delta = 1.2.
Considering that real peaks are higher then 24V, real peak I'd say +2V for rough estimation = 26V
Can those peaks be damaging for 25V electrolytic capacitor with no load? And with load? I personally think if there is a load, the cap cannot be fully flooded (charged), hence cannot be damaged that way. But I'm not sure.
UPDATE: Just in case I'll use 24V transil