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-   -   Apex B500 problems (https://www.diyaudio.com/forums/solid-state/221596-apex-b500.html)

azlospux 15th October 2012 04:57 PM

Apex B500 problems
 
I made my first high power amplifier and its not doing what its supposed to. When i power it up, through a 100 watt light bulb and the speaker is connected,it gives off a nasty hum, but when i connect the speaker after i have turned on the amp, it works properly. Could it be that i am doing something wrong, could it be that i didnt use the protection circuit, please help!:(:(:(:(

Ian Finch 15th October 2012 05:35 PM

Why not post this question in the B500 thread so that Apexaudio is aware and can make an informed reply?
http://www.diyaudio.com/forums/solid...r-limiter.html

azlospux 15th October 2012 06:26 PM

Ian, i did post in the thread but i did not get a reply, i am still a newbie here and still learning, hence i still need help from the more expirienced

Mooly 15th October 2012 06:31 PM

Quote:

Originally Posted by azlospux (https://www.diyaudio.com/forums/solid-state/221596-apex-b500-post3202547.html#post3202547)
I made my first high power amplifier and its not doing what its supposed to. When i power it up, through a 100 watt light bulb and the speaker is connected,it gives off a nasty hum, but when i connect the speaker after i have turned on the amp, it works properly. Could it be that i am doing something wrong, could it be that i didnt use the protection circuit, please help!:(:(:(:(

I'm not familiar with the amp so this is just a thought... could it be that the amp generates a switch on thump and that the light bulb is unable to sustain the rails when the speaker is present. The thump pulls the rails down on one side and causes a "lock up" due to insufficient current ability in the limited PSU.

Just a thought... as I haven't looked at the main thread.

WSJ 15th October 2012 07:00 PM

Quote:

Originally Posted by azlospux (https://www.diyaudio.com/forums/solid-state/221596-apex-b500-post3202547.html#post3202547)
I made my first high power amplifier and its not doing what its supposed to. When i power it up, through a 100 watt light bulb and the speaker is connected,it gives off a nasty hum, but when i connect the speaker after i have turned on the amp, it works properly. Could it be that i am doing something wrong, could it be that i didnt use the protection circuit, please help!:(:(:(:(

The power supply ripple will be higher with the bulb. What is the power supply ripple?

Where can I buy some boards?


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