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Old 18th February 2012, 03:58 PM   #991
BMW850 is offline BMW850  Netherlands
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7812 regulator between 0 and out is 10.51 volt
Measuring 13,2v between 0 and the entrance of the 7812, this must be 16volt after DC.
Transformer is 1x 12volt 1A

Rudy
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Last edited by BMW850; 18th February 2012 at 04:03 PM.
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Old 18th February 2012, 04:07 PM   #992
evette is offline evette  Canada
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This isn,t the pcb that rudi sells I would read the instruction that came with this unit. Evette
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Old 18th February 2012, 04:09 PM   #993
BMW850 is offline BMW850  Netherlands
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Quote:
Originally Posted by evette View Post
This isn,t the pcb that rudi sells I would read the instruction that came with this unit. Evette
There is no instruction manuel
I test the other speaker protection module and measure again.
Oeps, I measure with licht bulb tester.

Rudy
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Last edited by BMW850; 18th February 2012 at 04:12 PM.
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Old 18th February 2012, 04:10 PM   #994
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Originally Posted by BMW850 View Post
7812 regulator between 0 and out is 10.51 volt
Measuring 13,2v between 0 and the entrance of the 7812.

Rudy
You didn't say whether 10.51V was measured with the relays activated or not. Either way, the input voltage is too low for the regulator to operate correctly. The 7812 should produce 12 VDC (regulated) at its output and, while there may be just enough voltage to get the circuit working, it may prove to be unreliable. The absolute MINIMUM DC input to the regulator needs to be 14.5V.

Please advise me of the transformer specification, i.e. the quoted AC output voltage and its VA rating. Can you also measure the AC output voltage of the transformer when the relays are activated please.

Could you also confirm that the circuit at http://www.diyresearch.net/data/sp_protector_2ch/ matches your board. This is for a two-channel version, but should be similar to yours.

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currentflow

Last edited by currentflow; 18th February 2012 at 04:23 PM.
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Old 18th February 2012, 04:24 PM   #995
BMW850 is offline BMW850  Netherlands
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7812 regulator between 0 and out is 12.01 after click 10.51 volt
Measuring 18.05v between 0 and the entrance of the 7812 after click 13,2v

Quote:
What you need should be simpler one. Just need to have one 12-0 output, 1A current is quite enough.
No it's not enough ...

I connect the other transformer... after that I connect a 12v 10A I have here yet

Rudy
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Last edited by BMW850; 18th February 2012 at 04:29 PM.
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Old 18th February 2012, 04:44 PM   #996
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Originally Posted by BMW850 View Post
7812 regulator between 0 and out is 12.01 after click 10.51 volt
Measuring 18.05v between 0 and the entrance of the 7812 after click 13,2v


No it's not enough ...

I connect the other transformer... after that I connect a 12v 10A I have here yet

Rudy
I'm surprised you're seeing such a voltage drop before the regulator when the relays activate. If the relays are type Omron G2R-1-E 12DC as shown on the BOM, they will be each consuming around 40 mA. The entire circuit shouldn't need more than 100mA and twice this for both audio channels. In other words, a 500mA transformer would be more than adequate, yet your 1A is struggling. Could your transformer be faulty?

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Old 18th February 2012, 05:05 PM   #997
BMW850 is offline BMW850  Netherlands
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First have the other 12v 1A transformer plugged and measure exactly the same.
Have just connected a 12v 10A transformer, and this measure the same.
What is the utility of this 7812 regulator in this circuit?
The speaker protector also works with the small transformer

Rudy
Edit: I send a email to vintage_audio_lab
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Last edited by BMW850; 18th February 2012 at 05:28 PM.
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Old 18th February 2012, 05:29 PM   #998
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Originally Posted by BMW850 View Post
First have the other 12v 1A transformer plugged and measure exactly the same.
Have just connected a 12v 10A transformer, and this measure the same.
What is the utility of this 7812 regulator in this circuit?
The speaker protector also works with the small transformer

Rudy
Are the relays of the type I mentioned previously? Please confirm.

The purpose of the 7812 is to:
1) ensure that the relays operate at the right voltage &
2) ensure a consistent switch-on delay time.

As long as you don't exceed the maximum permissible relay coil voltage, you could remove the regulator and link the input to output pins.

However, a much better solution (assuming you don't have a 12-0-12V transformer) is to add two more diodes (type 1N4001-1N4007, or similar) to implement a full-wave bridge rectifier circuit. Then connect the transformer input between the two AC terminals. This will result in a greater voltage at the input to the 7812 under load and should solve the problem.
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Old 18th February 2012, 05:59 PM   #999
BMW850 is offline BMW850  Netherlands
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Yes I confirm this is Omron G2R-1-E 12VDC

Quote:
The purpose of the 7812 is to:
1) ensure that the relays operate at the right voltage &
2) ensure a consistent switch-on delay time.
2) The speaker protection module have a consistent switch-on delay time of 6 seconds.

Quote:
However, a much better solution (assuming you don't have a 12-0-12V transformer) is to add two more diodes (type 1N4001-1N4007, or similar) to implement a full-wave bridge rectifier circuit. Then connect the transformer input between the two AC terminals. This will result in a greater voltage at the input to the 7812 under load and should solve the problem.
I tested this module with 12v 10A transformer, and I have also a voltage drop ...

I hope the designer of the speaker protection module respond today on my email, he always respond.
I told him, I have a voltage drop, with this 7812 regulator.
I wait for his email, hope he respond on this forum he have the link.

Regards,
Rudy
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Last edited by BMW850; 18th February 2012 at 06:10 PM.
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Old 18th February 2012, 06:16 PM   #1000
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Originally Posted by BMW850 View Post
Yes I confirm this is Omron G2R-1-E 12VDC



2) The speaker protection module have a consistent switch-on delay time of 6 seconds.



I tested this module with 12v 10A transformer, and I have also a voltage drop ...

I hope the designer of the speaker protection module respond today on my email, he always respond.
I told him, I have a voltage drop, with this 7812 regulator.
I wait for his email, hope he respond on this forum he have the link.

Regards,
Rudy
Thanks for your reply. I am fairly confident that adding two diodes will solve the problem. Fitting these is simplicity itself and can be done at the screw terminal block.

Connect one diode between the upper AC and 0 with the diode's band (cathode end) nearest the upper AC terminal.

Connect the second diode between the lower AC terminal and 0 with the band nearest the lower AC terminal. Connect your transformer between the two AC terminals only.
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