# voltage regulators and supercaps? Answered

i have 12 .22F 5 volt supercapacitors that i bought recently. Ive been thinking about making something like the Mintyboost from Adafruit but am unsure on how to do it with supercaps.
Any help is appreciated as this is stumping me pretty well.

thanks, bud

Tags:

## Comments

The forums are retiring in 2021 and are now closed for new topics and comments.
Ahem     12  Capacitors (o.22F @ 5VDC )

IN SERIES
• V = 12 × 5V = 60 V DC
• C = o.22F  / 12 = o.0183F
• E = C × V2 / 2 = .0183 × 60  × 60 / 2 = 33 Joules

IN PARALLEL
• V = 5 V DC
• C = o.22F ×12 = 2.64F
• E = C × V2 / 2 = 2.64 × 5  × 5 / 2 = 33 Joules

Which do you need for your application :-)

A
Try 500 ohms which at  5 VDC will pull I = V / R = 5 / 500 = 10 ma
• Charge the capacitor in position [A] for under 1.9 Hrs
• Or put a diode across R to charge in 3 min
• Time Constant = RC = 500 × 2.64 = 1320 sec = 22 min
• Switch to position [B]
• In 22 min a start current of 10 ma will exponentially decay to 3.7 ma
• It is a rule of thumb that a capacitor discharging through a resistor will decay to 37% in the RC time constant.

A