Choose the best value of capacitor

Thread Starter

BintarYudo

Joined May 6, 2018
6
Im currently working for college assignment and i intend to make a power supply, how do i choose the best value of capacitor for my project?
my power supply is 15Volts and 2 Amperes
 

bertus

Joined Apr 5, 2008
20,230
Hello,

That circuit looks like an overvoltage protection and not a powersupply.
What are you trying to make?

Bertus
 

ericgibbs

Joined Jan 29, 2010
9,349
hi,
It looks as though the purpose of the capacitor is to add hysteresis to the relays operation, I would try a 100uF or 470uF.
Where did you find the circuit.?
E
 

Thread Starter

BintarYudo

Joined May 6, 2018
6
is there any calculation for determining the capacitor value?
if i change the input to 18Volt, do i need to change the capacitor too?
sorry i forgot where i got this circuit
 

ericgibbs

Joined Jan 29, 2010
9,349
The 1meg pot sets the SCR trigger voltage, reset it when using the 18V input voltage level.
It make take a few attempts to get the 1meg setting correct, for say 18.5V as an example.
What is the value of D6.?

The C1 cap should be rated at least 25V working voltage.
 
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