Salas hotrodded blue DCB1 build - Page 124

df_genius · 15th August 2011, 05:30 PM

Quote:

Originally Posted by AndrewT

Check the voltage across the relay diode.

Hi, It is 0V

AndrewT · 15th August 2011, 10:57 PM

Then the relay has no trigger signal.
That could be the transistor switch that is not working or some other faulty component.

You need to now measure back through the relay drive circuit to find where the error starts.

parodielin · 16th August 2011, 12:31 AM

I have some of these left around:

Dayton DNR-10 10 Ohm 10W Precision Audio Grade Resistor

10 ohm 10 W sandcast. Would it OK to replace the parallel 68 ohm so I can bring the current to 200 mA?

Tea-Bag · 16th August 2011, 12:57 AM

Yes, that's fine.

Salas · 16th August 2011, 01:20 AM

Quote:

Originally Posted by df_genius

Hi, It is 0V

Quote:

Originally Posted by AndrewT

Then the relay has no trigger signal.
That could be the transistor switch that is not working or some other faulty component.

You need to now measure back through the relay drive circuit to find where the error starts.

Surely the ''note'' jumper for a 12V relay is installed?

AndrewT · 16th August 2011, 11:53 AM

You are referring to the relay circuit ground return link, located elsewhere on the PCB.

df_genius · 16th August 2011, 01:04 PM

Thanks for the help guys, turns out it was the BC550. All working fine now thanks. David

Salas · 16th August 2011, 01:08 PM

Quote:

Originally Posted by AndrewT

You are referring to the relay circuit ground return link, located elsewhere on the PCB.

The jumper at ''note'' resistor position Is linking the 12V line to the relay.

Salas · 16th August 2011, 01:14 PM

Quote:

Originally Posted by df_genius

Thanks for the help guys, turns out it was the BC550. All working fine now thanks. David

Nice.

AndrewT · 16th August 2011, 01:17 PM

both those resistors are in parallel. Only one is needed to supply the relay coil.

I have split those resistors in a MEZ build, one feeds the mute/unmute relay with 15Vdc from a 7815 using 2k as the dropping resistor.
The other feeds the selector relays. I use 1k here, but without the current boost at start up sometimes the relay does not fire. All I do is turn the selector and then the (or any) relay always triggers on re-selection.

In my Hyp build I used one resistor to feed the relays and the other resistor to feed the current boost. Again that was 15Vdc into a resistor fed 12V relay.

16th August 2011, 12:31 AM	#1233
parodielin diyAudio Member Join Date: Jan 2010	10W Sandcast Resistor I have some of these left around: Dayton DNR-10 10 Ohm 10W Precision Audio Grade Resistor 10 ohm 10 W sandcast. Would it OK to replace the parallel 68 ohm so I can bring the current to 200 mA?

16th August 2011, 12:57 AM	#1234
Tea-Bag not politcally affiliated diyAudio Member Join Date: Feb 2006 Location: Kennebunk Blog Entries: 7	Yes, that's fine. __________________ Salas Boards 2013 #2 CLICK HERE \| F6 Covertible PCB GB Boards Available \|DCB1 boards and KITS available PM\|SemiSouth R125, R100, R100A Available CLICK HERE \|F5TC Boards Sign UP CLICK HERE

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15th August 2011, 10:57 PM	#1232
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Then the relay has no trigger signal. That could be the transistor switch that is not working or some other faulty component. You need to now measure back through the relay drive circuit to find where the error starts.

16th August 2011, 11:53 AM	#1236
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	You are referring to the relay circuit ground return link, located elsewhere on the PCB.

16th August 2011, 01:04 PM	#1237
df_genius diyAudio Member Join Date: Mar 2006 Location: Sheffield, England	Thanks for the help guys, turns out it was the BC550. All working fine now thanks. David

16th August 2011, 01:17 PM	#1240
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	both those resistors are in parallel. Only one is needed to supply the relay coil. I have split those resistors in a MEZ build, one feeds the mute/unmute relay with 15Vdc from a 7815 using 2k as the dropping resistor. The other feeds the selector relays. I use 1k here, but without the current boost at start up sometimes the relay does not fire. All I do is turn the selector and then the (or any) relay always triggers on re-selection. In my Hyp build I used one resistor to feed the relays and the other resistor to feed the current boost. Again that was 15Vdc into a resistor fed 12V relay.