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900W H-class PA Amp with Limiter
900W H-class PA Amp with Limiter
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Old 14th April 2019, 02:11 PM   #3721
masood251 is offline masood251
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Quote:
Originally Posted by apexaudio View Post
Input GND missing! Amplifier can't work without connect input GND. I can't see wire jumper (red line on component layout) on botom side of pcb, somethimes I forget connect that wire.
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Hi sir
Good evening i have completed h900
before 2years but now i have time to check it.i have problem my dc voltages are at without load is 66v dc and 115 v dc after load voltages becomes 37v dc and 77 v dc what the problem please solve me.thanking you.

Last edited by masood251; 14th April 2019 at 02:15 PM.
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Old 16th April 2019, 02:43 AM   #3722
masood251 is offline masood251
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Finally i success in making h900 after changing 2n5401 and its 100 ohm resistance.But how can i know that my stepper is working.please help me.thanks
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Old 16th April 2019, 06:06 AM   #3723
44250 is offline 44250  Serbia
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put some high input signal and measure output voltage.
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Old 17th April 2019, 04:35 AM   #3724
masood251 is offline masood251
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At ab class mode across 100ohm volts are o.25 and at mje340 collector emitter 1.6volts just half as mentioned in apex circuit.thanking you
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