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Old 15th August 2011, 05:30 PM   #1231
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Quote:
Originally Posted by AndrewT View Post
Check the voltage across the relay diode.
Hi, It is 0V
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Old 15th August 2011, 10:57 PM   #1232
AndrewT is offline AndrewT  Scotland
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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.
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Old 16th August 2011, 12:31 AM   #1233
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Default 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?
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Old 16th August 2011, 12:57 AM   #1234
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Yes, that's fine.
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Old 16th August 2011, 01:20 AM   #1235
Salas is offline Salas  Greece
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Quote:
Originally Posted by df_genius View Post
Hi, It is 0V
Quote:
Originally Posted by AndrewT View Post
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?
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Old 16th August 2011, 11:53 AM   #1236
AndrewT is offline AndrewT  Scotland
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You are referring to the relay circuit ground return link, located elsewhere on the PCB.
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Old 16th August 2011, 01:04 PM   #1237
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Thanks for the help guys, turns out it was the BC550. All working fine now thanks. David
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Old 16th August 2011, 01:08 PM   #1238
Salas is offline Salas  Greece
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Quote:
Originally Posted by AndrewT View Post
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.
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Old 16th August 2011, 01:14 PM   #1239
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Originally Posted by df_genius View Post
Thanks for the help guys, turns out it was the BC550. All working fine now thanks. David
Nice.
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Old 16th August 2011, 01:17 PM   #1240
AndrewT is offline AndrewT  Scotland
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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.
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