The type of rectifier is very important, it has to be rated to withstand the high voltage. Something in the order of 1000v PIV within the spec. of the bridge rectifier, current of upto an amp should be ok.
Something along the lines of this, for example....
To understand the black art of electronics is to understand witchcraft. Andrew.
hi I did order a 400v 35a rectifier as the highest voltage I could see on the schematic was 270v. why do you suggest a 1000v rectifier? have I missed something? so will the 1 I have order be no good..
Can you post a link to the rectifiers spec, that 400v could mean a few things, very often PIV which is too low.
As Andrews post 1000v PIV min required, the one Andrew posted would be suitable, however it is silicon, the original will be selenium so you may need a suitable Wire Wound resistor to reduce the HT.
Frank
hi I did order a 400v 35a rectifier as the highest voltage I could see on the schematic was 270v. why do you suggest a 1000v rectifier? have I missed something? so will the 1 I have order be no good..
The PIV is the peak inverse voltage which the diodes can withstand. For safety, a higher PIV voltage is usually used. It would be wise to use 1000v PIV as there can be voltage spikes exceeding the 400v rating of the one you ordered. The 400v one may work fine, but there is a risk of it going short circuit and you would be back to square one.
https://en.wikipedia.org/wiki/Peak_inverse_voltage
To understand the black art of electronics is to understand witchcraft. Andrew.
its a KBPC3504 bridge rectifier. https://www.alliedelec.com/product/hvca/kbpc3504/70015998/
I will order some 1000v ones also better be safe then sorry
The peak of mains is 340V (240 x 1.414) so peak to peak is twice this = 680V. So you see why 400V is no good.....not for reliable operation anyway.
update the voltage on the chassis before was 110v ac now putting a new rectifier in im getting 110v dc on the chassis. the 110v dc is going from the rectifier to the chassis so transformer is still buzzing loud any more suggestions??
Make sure you have the rectifier connected correctly.
