Salas hotrodded blue DCB1 build - Page 199 - diyAudio
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Old 7th June 2012, 08:09 PM   #1981
atupi is offline atupi  Romania
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AZ850-5 ZETTLER - Releu: electromagnetic | Transfer Multisort Elektronik
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Old 8th June 2012, 10:02 PM   #1982
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I have changed to BC517/BC550 but i dont have good news. First time didn't worked even the voltage acress relay coil increased from 0.8v to 1.4v. I shorted the 2x600R position and the relay clicked and it clicks on and of as i'm powering or disconneting power of DCB1 but there is no delay. I have installed anyway a 10R resistor in position of 2x600R and i have 4.4V acress relay coil. This circuit is really strange for me.

The goos news is that i have 0.2V difference between the two rails and DC out is very low 0.01\0.025
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Old 8th June 2012, 10:13 PM   #1983
Salas is offline Salas  Greece
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Have a look here, is there anything not matching in your self made board?
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File Type: gif RelayVias.gif (35.3 KB, 255 views)
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Old 8th June 2012, 10:22 PM   #1984
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But Salas this is the buffer part and is working well.
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Old 8th June 2012, 10:25 PM   #1985
Salas is offline Salas  Greece
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Wondering about the relay connections. Here is the delay part up close too.
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Old 8th June 2012, 10:51 PM   #1986
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I will have a closer look tomorrow. If i understand well this circuit should trigger the relay after few secons of powering up, right ?

Meantime i must prepare for my vacation to Greece
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Old 8th June 2012, 10:55 PM   #1987
Salas is offline Salas  Greece
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Yes, after a little, and go out fast at power off.
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Old 10th June 2012, 12:33 PM   #1988
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Good news, now is working and the problem was the orientation of the transistors wich in the first page of this thread is in the oposite way.
Thank you very much Salas for your support.
In this last picture i see also the GND is connected to the relay wich was not in the other pictures seen on the thread.
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Old 10th June 2012, 12:58 PM   #1989
Salas is offline Salas  Greece
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There is always some explanation. Nice you got it in order. That one with the double sided pcb with upper side red vias is the long time now standard one with shorting to ground relay outputs at rest position.
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Old 22nd June 2012, 01:37 PM   #1990
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Default HEAT!

Hi There,

I built one of the buffers into a really nice 10mm thick aluminum case, and after experimenting with the current regulating resistor, settled on 10ohms.

I leave my pre-amp on all the time and wondered about the heat dissipation, as the case seems to get hotter when I have no signal going through the B1. At very low volumes it is quite cool and it then seems to heat up again when I am playing decent volumes.

Obviously I cannot feel immediate temp changes and am making these observations after several hours in each volume/playback state.

does anyone have an explanation of this behavior? Is it a side effect of the current flow when idle, similar to class A?

Brad
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