DCP going south??

roccus

roccus

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laatsch55 said:
Jesus, the world is run by C students and insurance companies...
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lol yes for sure.. and people wonder why I have been a bit grouchy over the summer.. I just want to get this nit wit off my butt let em go screw with someone else
 
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laatsch55 said:
Tomorrow we will feed each channel a 10hz signal and start at 150 millivolts input and go up until we trip the DCP, WHILE you monitor the output with your meter on AC volts.....
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OK at 10hz I increase power till DCP trip I have my meter set to hold highest voltage reading mv and V do apply to my readings all AC votages ....

Left channel trips at 2.02 V AC
Right channel trips at 1.97 V AC

I checked the output on the PL 3000

No input left channel 1.568 mv AC
No input right channel 1.815 mv AC

I also connected my XM receiver to it to get voltage output readings with input

Right channel volume control at 0 .372 V AC
Right channel volume control at 1/2 open 1.03 V AC
Right channel volume control at wide open 4.33 V AC

Left channel volume control at 0 .519 mvAC
Left channel volume control at 1/2 open .785 V AC
Left channel volume control at wide open 5.26 V AC

Note on the PL 3000 all I have done to it so far is replaced all the electrolytic caps... interesting this shows me why I the left channel seemed a bit louder... also it would appear that at wide open full throttle the voltage goes past the DCP trip range??
 
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laatsch55

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OK, let's do it like this.......


Hook meter up to output of amp, get your load resistors on that too. Walk up input from zero to NO MORE THAN 40 volts on output. sTART WITH 100HZ, THEN 40, THEN 20 , AND LAST 10HZ.

Your pre amp is fine but we dont need it right now. What we are trying to establish right now is that the DCP is doing what it's supposed to. 40 volts out is 200 watts out.
 
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Note on the PL 3000 all I have done to it so far is replaced all the electrolytic caps... interesting this shows me why I the left channel seemed a bit louder... also it would appear that at wide open full throttle the voltage goes past the DCP trip range??[/QUOTE]

You have to feed the pre-amp with the sig generator before you make any assumptions on output discrepencies...
 
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laatsch55 said:
OK, let's do it like this.......


Hook meter up to output of amp, get your load resistors on that too. Walk up input from zero to NO MORE THAN 40 volts on output. sTART WITH 100HZ, THEN 40, THEN 20 , AND LAST 10HZ.

Your pre amp is fine but we dont need it right now. What we are trying to establish right now is that the DCP is doing what it's supposed to. 40 volts out is 200 watts out.
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OK Lee we will have to hold off on this I ordered load resistors back on the 7th from china but they are not here yet.... I did the thing with the PL 3000 just to see what was happening with the receiver output
 
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OK, I understand that. But I wouldn't make assumptions on pre-amp output based on a tuner input....
 
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today I was in and out of the shop so just for the hell of it I decided to put the generator on the wopl 400 set at 10hz about 1.8 volts AC to the input with nothing connected to the output... first I put it on the right channel it ran ok at first but within an hour the DCP tripped so then I put it on the left channel same deal 10hz about 1.8V AC and it appeared to be ok at first but again within an hour the DCP tripped again. Should this be doing that at 1.8V input?
 
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You do realize that a steady state sine wave at 10hz for an hour is something that will NEVER happen playing music??
 
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laatsch55 said:
You do realize that a steady state sine wave at 10hz for an hour is something that will NEVER happen playing music??
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Probably not LEE but I was wondering about the voltage steady 1.8V why does the amp not like 10hz at a lower than peak voltage... remember peak seemed to be 2V AC at 10hz to trip the DCP
 
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laatsch55 said:
I don't know precisely WHY it's doing it, what did the sine wave look like?
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The question is should it be doing that?? I did not put a scope on it yet I had quite a bit going on today probably the last real nice day we will have till who knows when.. hit 70 today tomorrow back to the low 50's.. spent afternoon with wife out on the range
 
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