# Diode Voltage

#### fortunare

Joined Aug 29, 2011
1
I have a circuit specifying a 1000V 6Amp diode . I have several 50 volt 6 amp diodes. Can I use them in parallel to reduce 120 volt AC to 12volt DC via a resistor? thanks, Mike <SNIP>

Last edited by a moderator:

#### ht systems

Joined Aug 2, 2011
71
in my opinion no you cant , because your diodes handel 50 volt and you want to connect it to 120 v , it would explosion because the angle of the the capacity is too big .

#### t_n_k

Joined Mar 6, 2009
5,455
You probably mean - can you connect diodes in series to increase the overall voltage rating. You can do this provided you make additional circuit provisions to compensate for the different reverse leakage properties of individual diodes in the series string.

In any case this sounds like a proposal for a transformer-less rectifier /power supply circuit which is a taboo topic on the forum.

#### praondevou

Joined Jul 9, 2011
2,942
You probably mean - can you connect diodes in series to increase the overall voltage rating. You can do this provided you make additional circuit provisions to compensate for the different reverse leakage properties of individual diodes in the series string.
@fortunare . before you ask, the easiest way to compensate for different reverse leakage currents is to provide a higher then leakage current path in parallel to each diode, i.e. to put a resistor in parallel with each diode , all resistors having the same value.

example: peak value of 120ac is 169V, if you put 4 or better 5 diodes in series you could put 47k in parallel with each diode. (common low wattage resistors.)

The best value however depends on the diodes characteristics/model.

Can I use them in parallel to reduce 120 volt AC to 12volt DC via a resistor?
This looks like a strange to do, sure that's what you want?

Last edited: