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Direct Coupled B-1 Buffer - Hypnotize troubleshooting
Direct Coupled B-1 Buffer - Hypnotize troubleshooting
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Old 5th November 2017, 04:55 PM   #1
Pboden is offline Pboden  Norway
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Default Direct Coupled B-1 Buffer - Hypnotize troubleshooting

Been away from diy audio for years and yesterday I ran through some old stuff in the attic and found an old project that never was finished - among the B1 Buffer.

I started up the B1 buffer today, but I can not get it running - that is no music.
I see that there are some leds that do not start.

Appreciate any help on troubleshooting.
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Old 6th November 2017, 05:47 AM   #2
Rodeodave is offline Rodeodave  Austria
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Direct Coupled B-1 Buffer - Hypnotize troubleshooting
Looks like the V+ side of the regulator doesn't turn on. I'm saying that because the 5 LEDs stay dark. Check part orientation and solder joints.
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Old 6th November 2017, 01:28 PM   #3
AndrewT is offline AndrewT  Scotland
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if you are really careful you can measure the voltage across each LED.
You may find that one has a very high voltage indicating it has been inserted in reverse.
Can you see the flat edge indicating the -VE side of the pair of lead outs?
All the good ones should have around 1.7Vdc to 1.8Vdc across them. That is the Vf when current is passing.
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Old 6th November 2017, 02:46 PM   #4
Pboden is offline Pboden  Norway
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Well I just removed the leds on the "faulty" side and there are no voltage on the pcb.
Where/what is the source for those five leds ?

Thanks

Last edited by Pboden; 6th November 2017 at 03:08 PM.
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Old 6th November 2017, 07:25 PM   #5
AndrewT is offline AndrewT  Scotland
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do you still have the schematic?
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Old 6th November 2017, 07:40 PM   #6
Pboden is offline Pboden  Norway
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Yes, found it - Mezmerize B1 Buffer – diyAudio Store

Trying to locate the possible culprit so I believe I have to start messure somewhere, so any tips would be appreciated.
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Old 6th November 2017, 08:30 PM   #7
AndrewT is offline AndrewT  Scotland
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start at the AC input.
Then move to the rectifier in and out.
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Old 6th November 2017, 09:27 PM   #8
Pboden is offline Pboden  Norway
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I get no voltage on one of the irf9240. Around 6Vdc on the other.
Just made a order for new ones.
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Old 12th November 2017, 08:54 PM   #9
Pboden is offline Pboden  Norway
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What is actually accepted AC input (range) on the board ? My previous problem may be due to a faulty transformer.

Thanks
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Old 13th November 2017, 07:55 AM   #10
AndrewT is offline AndrewT  Scotland
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The DCB1 needs at least 5V and preferably 7V across the CCS part of the regulator.
This is required when the mains voltage is at it's lowest.
You can use a dual 15Vac secondary wired as a centre tapped secondary and in normal operation you will measure 20Vdc to 22Vdc on the main smoothing capacitors.
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