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Old 6th August 2012, 11:23 PM   #1
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Default Soundigital 8K

What is the IC located next to the IR2010's, the number is scratched off. I will post a pic in a bit.
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Old 7th August 2012, 08:13 PM   #2
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Photo

I need a resistor value also circled on the pic. Emails sent off to Jose Diaz and others, no reply yet.
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File Type: jpg SD8000.1.jpg (208.6 KB, 147 views)
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Old 8th August 2012, 06:40 PM   #3
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Anyone from Brazil that can get any info, reps in the US are non-existent.
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Old 8th August 2012, 11:27 PM   #4
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HEF4070 is the IC and the resistor is 10ohm .25watt
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Old 8th August 2012, 11:47 PM   #5
timwebb is offline timwebb  United States
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i never seen one.... thought it would be kinda bigger for a 8k amp.
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Old 9th August 2012, 01:53 AM   #6
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Efficient, using a microprocessor for all the pwm signals and IC's for the drive signals. All that is left would be the supply and input circuitry.
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Old 18th September 2012, 01:26 AM   #7
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The clip light is always on when I have the outputs enabled. If I disable the outputs with the switch clip light goes out until the input signal is increased.

Anyone have thoughts on this amp?
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Old 18th September 2012, 02:58 AM   #8
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The clip light is figured out, switch was put in the wrong state.

I get very little output of this thing, I can see the carrier with the 40hz on it, but after the filter I get nothing. The inductors are not open, maybe the cap?
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Old 18th September 2012, 11:49 AM   #9
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Is the pulse width of the PWM signal on the carrier going from near 0% to near 100%?

If not, the problem is the signal driving the input of the class D circuit.
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Old 18th September 2012, 05:45 PM   #10
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Quote:
Originally Posted by Perry Babin View Post
Is the pulse width of the PWM signal on the carrier going from near 0% to near 100%?

If not, the problem is the signal driving the input of the class D circuit.

It doesn't seem to be, the layout of the 3 quad package op-amps has me baffled. A few have a square wave on the outputs while others have a triangle waveform and a few have the sine wave input signal.
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