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Old 1st January 2012, 08:49 PM   #11
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That is odd indeed, what frequency are we talking about? The SR71s should be easy to drive and should not trigger the amplifiers protection circuitry (unless poorly designed) at only 15vp-p.
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Old 1st January 2012, 09:07 PM   #12
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I build the amp myself and it does not have any speaker protection just DC offset protection.
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Old 1st January 2012, 09:31 PM   #13
tvrgeek is offline tvrgeek  United States
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Ah-ha, now you have the details. Yea, half rail seems a bit shy for the amp. Seems you have narrowed down the culprit. The SR71 does not look like a difficult load. If you amp poops out into a resistive load, I would look to see what might be incorrect before I started modifying it. Are the rails collapsing?
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Old 1st January 2012, 09:32 PM   #14
kevinkr is offline kevinkr  United States
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Something is definitely amiss in the power amplifier, sounds like the driver stages are running out of current (if this amp has bipolar output devices) before you even begin to approach the rails unless they are sagging drastically under load which is probably the next thing to check.
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Old 1st January 2012, 09:32 PM   #15
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I think there is something wrong with the amp.

I connected the amp to a function generator and sent a 1KHz sine wave into it.
I connected an AC meter and oscilloscope to the amp output with NO LOAD and the max volts the amp will make before clipping is 14.9VAC on the meter with 700mv into it.
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Old 1st January 2012, 09:45 PM   #16
tvrgeek is offline tvrgeek  United States
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By the way, how do you like the SR71's?
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Old 1st January 2012, 09:47 PM   #17
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I love the SR71's I'm new to the (Audiophile) world and I have never heard speakers that sounded this clear and refined.
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Old 1st January 2012, 10:01 PM   #18
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Here is the circuit I am using for my amp including the HFE grades. It's zobel is on the binding posts thats why its not in the circuit. Do you see any major flaws in the circuit.
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Old 1st January 2012, 10:24 PM   #19
amptech is offline amptech  Scotland
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Benproiii, try this remove c7/c8 r7/r6/ and c19..replace c10/c11 with 100uf and c4/9 with 100nf. c20 up it to 47uf.

add a 10uf bp at the input of the amp...
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Old 1st January 2012, 10:33 PM   #20
godfrey is offline godfrey  South Africa
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@benproii:
Nothing obvious, although it is different to the HRII schematic I found on Greg's website (so FWIW, my earlier comments about zeners don't apply here).

I suppose the first thing to check is all the supply rail voltages, as shown below.

@amptech:
Why? Changing C20 may improve the bass and adding an input cap will reduce the chance of DC offset, but none of those changes will fix the actual problem.
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Last edited by godfrey; 1st January 2012 at 10:42 PM.
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