Apex B500 problems

azlospux · 15th October 2012, 04:57 PM

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?
500W PA amplifier with Limiter

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

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

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?

15th October 2012, 04:57 PM	#1
azlospux diyAudio Member Join Date: Jun 2011 Location: Harare, Zimbabwe	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!

15th October 2012, 05:35 PM	#2
Ian Finch diyAudio Member Join Date: Apr 2010 Location: Coffs Harbour, on the east coast	Why not post this question in the B500 thread so that Apexaudio is aware and can make an informed reply? 500W PA amplifier with Limiter __________________ regards

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15th October 2012, 06:26 PM	#3
azlospux diyAudio Member Join Date: Jun 2011 Location: Harare, Zimbabwe	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