rectifier board not working after putting on bypass caps.

demogorgon · 5th December 2004, 08:50 PM

hello!

my rectifier board with 8 mur1520 diodes stopped working after i installed bypass diodes to take care of diode ringing.
I measure voltage into the board, but nothing out of it.

i put the caps in paralell with the diodes. they are 0.15uf 63V devices, polypropylen i think.
what have i don wrong?

regards
marius

peranders · 5th December 2004, 09:16 PM

.... the soldering, maybe. I suggest that you check the connections once more. Do you have any AC voltage into the rectifier?

demogorgon · 5th December 2004, 09:40 PM

i checked all the connections, they are all correct.
Yes, AC in to the rectifier, dead/nothing out.

peranders · 5th December 2004, 10:08 PM

Have you checked the diodes with a DVM? Do have have any voltage across the diodes? How many volts across the AC inputs of the bridge?

demogorgon · 5th December 2004, 10:20 PM

DVM?

and volt across the diodes? well i would guess so, considering that they manage to create ground. so at least four of the eight..

17.8V ac across the inputt

thank's for helping!
marius

peranders · 6th December 2004, 05:51 AM

... you don't guess, you have to know. Just measure! If you don't have experienced any smokeand blown fuses I'll doubt that you have broken the diodes. You carefully and nice have soldered in caps in parallel of the diodes and now nothing is working. You can actually use DVM and the "diode test" and check the diodes. You should get 0.5-0.7 volt in forward direction and much higher in the reverse direction, not necessarilly 1.999 if the bridge is connected.

You should also check you wiring.

digi01 · 6th December 2004, 06:03 AM

Quote:

Originally posted by demogorgon
hello!

my rectifier board with 8 mur1520 diodes stopped working after i installed bypass diodes to take care of diode ringing.

before you installed bypass caps,what about the rectifier runing?

Nuuk · 6th December 2004, 08:57 AM

Would he need to connect a load to measure the bridge?

Markje · 6th December 2004, 09:55 AM

If you connect a load, it will finfluence your measurement. If you measure diodes, the best way is to desolder them, otherwise, you should measure what peranders is saying, .5 to .7 in one way and something else in the other way (depending on the diode you are measuring).

Greetz Mark

peranders · 6th December 2004, 09:58 AM

You can do pretty good troubleshooting also when the diodes are connected.

5th December 2004, 08:50 PM	#1
demogorgon diyAudio Member Join Date: Jul 2004 Location: Behind you.	rectifier board not working after putting on bypass caps. hello! my rectifier board with 8 mur1520 diodes stopped working after i installed bypass diodes to take care of diode ringing. I measure voltage into the board, but nothing out of it. i put the caps in paralell with the diodes. they are 0.15uf 63V devices, polypropylen i think. what have i don wrong? regards marius

5th December 2004, 09:16 PM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	.... the soldering, maybe. I suggest that you check the connections once more. Do you have any AC voltage into the rectifier? __________________ /Per-Anders (my first name) or P-A as my friends call me

5th December 2004, 10:08 PM	#4
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Have you checked the diodes with a DVM? Do have have any voltage across the diodes? How many volts across the AC inputs of the bridge? __________________ /Per-Anders (my first name) or P-A as my friends call me

6th December 2004, 05:51 AM	#6
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	... you don't guess, you have to know. Just measure! If you don't have experienced any smokeand blown fuses I'll doubt that you have broken the diodes. You carefully and nice have soldered in caps in parallel of the diodes and now nothing is working. You can actually use DVM and the "diode test" and check the diodes. You should get 0.5-0.7 volt in forward direction and much higher in the reverse direction, not necessarilly 1.999 if the bridge is connected. You should also check you wiring. __________________ /Per-Anders (my first name) or P-A as my friends call me

6th December 2004, 08:57 AM	#8
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	Would he need to connect a load to measure the bridge? __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

5th December 2004, 09:40 PM	#3
demogorgon diyAudio Member Join Date: Jul 2004 Location: Behind you.	i checked all the connections, they are all correct. Yes, AC in to the rectifier, dead/nothing out.

5th December 2004, 10:20 PM	#5
demogorgon diyAudio Member Join Date: Jul 2004 Location: Behind you.	DVM? and volt across the diodes? well i would guess so, considering that they manage to create ground. so at least four of the eight.. 17.8V ac across the inputt thank's for helping! marius

6th December 2004, 09:55 AM	#9
Markje diyAudio Member Join Date: Jan 2004 Location: The Netherlands	If you connect a load, it will finfluence your measurement. If you measure diodes, the best way is to desolder them, otherwise, you should measure what peranders is saying, .5 to .7 in one way and something else in the other way (depending on the diode you are measuring). Greetz Mark

6th December 2004, 09:58 AM	#10
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	You can do pretty good troubleshooting also when the diodes are connected. __________________ /Per-Anders (my first name) or P-A as my friends call me

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Putting the Simple SE back together - blown PT - Flashing Rectifier	cjkpkg	Tubelab	13	15th October 2008 01:27 PM
bypass caps for bypassing mylar caps?	crippledchicken	Multi-Way	4	27th February 2008 04:24 AM
Bypass caps on crossover caps... :D	quickshift	Multi-Way	19	27th November 2005 12:59 PM
PSU bypass caps	Sunsun22	Chip Amps	2	30th August 2004 01:02 PM
PSU Bypass Caps	JoeBob	Solid State	1	18th February 2002 09:00 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read