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Author Topic: Light Bulb Limiter  (Read 57432 times)

Bill Moore

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Re: Light Bulb Limiter
« Reply #60 on: July 30, 2015, 03:43:12 PM »
I can't seem to add a pic, I'll try a link to my "spare parts" limiter.
http://images.lilypix.com/displayimage.php?pid=62743&fullsize=1
« Last Edit: September 11, 2015, 11:16:15 AM by Bill Moore »

nzst205

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Re: Light Bulb Limiter
« Reply #61 on: April 10, 2016, 09:21:11 PM »
The biggest lightbulb I can find is 140W. I am trying to test a Solid State Amp (Jamo) when I connect to Amp via the light build it glows slightly then when I press the ON button the the amp it glows REALY bright (doesn't blow) and the amp turn off.
Is this indicating that I need a bigger light build or indicating a direct short in the power supply.
Interestingly if a plug the amp straight into the mains the amp now works some of the time.
There are 4 10000uf caps in the power supply, perhaps this phenomina is just the caps trying to charge ? and thus a bigger build is needed perhaps.
With the amp running it is drawing 0.14 amps without speakers attached so not a big load.
Any assistance for this newbe would appreciated.

nosaj

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Re: Light Bulb Limiter
« Reply #62 on: April 10, 2016, 09:46:15 PM »
The light bulb is not supposed to blow. It is just a visual indicator of an issue if one is there and yours says yes there is a problem.
The direct short could be in the power supply or elsewhere.  Do you have a schematic or exact model number?

Thanks,
nosaj

nzst205

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Re: Light Bulb Limiter
« Reply #63 on: April 10, 2016, 09:53:22 PM »
Yes I have a schematic, attached

phatt

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Re: Light Bulb Limiter
« Reply #64 on: April 11, 2016, 04:24:17 AM »
If the unit is working then there is very little need for the light bulb.
This is a very complex circuit with many potential points to check.
The most likely issue would be all those circuit breakers.
Check "AVR power board" and the relay board for clues.

With a wooden stick gently probe around all the relay circuits to see if you can find which one is causing the problem.
Phil.

nzst205

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Re: Light Bulb Limiter
« Reply #65 on: April 12, 2016, 01:08:35 PM »
Thanks of your input. Taking a root-cause-analysis approach I started with the light build box and found that inside of it the power plug receptacle had blown black gunk out of the vent hole in the bottom this was why it would start up without the light bulb device but with the lightbulb in series it was limiting the power available to start up properly. Using your suggestion I found that the main power relay continued 'chattering' after the amp off power switch was replaced so that is the next replacement but probably also indicating that there is some ghost voltage flowing to the relay, perhaps the diode across the relay may also be faulty, will replace for good measure.

substatica

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Re: Light Bulb Limiter
« Reply #66 on: September 16, 2016, 08:20:54 PM »
Here's my 5 minute limiter...

phatt

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Re: Light Bulb Limiter
« Reply #67 on: September 17, 2016, 07:10:43 AM »
Yep,, that is all you need,, saves lotsa headaches. :tu:

dlbraly

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Re: Light Bulb Limiter
« Reply #68 on: July 15, 2018, 09:45:49 AM »
Here is the one I made.
I made a shorting plug as well, figured it would be easier to check to make sure the bulbs were good. Not much use if you have bad bulbs in it.

Only thing I purchased were the bulbs.
« Last Edit: July 15, 2018, 09:47:08 AM by dlbraly »

 

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