![]() So lets see if these can be explained and hopefully detailed on the schematic. I did test those baby latfets to 127 watts before I ran out of transformer, but I was using speaker protection, just in case. So, if you're going higher than that, do consider output caps or speaker protector kit. The operating voltage for bridge mode is with a 20+20vac transformer (max). That example is off a bit, but not nearly as far as the datasheet schematic.īefore using the amplifier in bridge mode, I'd like to see it running quite happily clear and definitely running cool temps. This ballpark is a good spot to start exploring. Nearby values make really similar results. To make a reasonable compromise, you could set the feedback-shunt resistor to 2k2 and the feedback resistor to 56k (or even 68k if going without a preamp). The feedback current might be too high due to feedback-shunt and feedback resistor values too small, which also causes fragility and current noise of overloading the small signal section beyond linearity. If you want hi-fi, I think you want low gain power amp pushed by a preamp. The quality drops if the gain is too high. If it still does some midfi behavior, the gain might be set too high, since it doesn't really have enough gain capacity for a 70w amplifier. (the schematic shows 22u, which is a bass blocker)Īlso for low bass this amplifier appreciates a large power supply reservoir capacitance, not located on same board as amplifier. Then the lowest lows and highest highs should be working. Try the bootstrap cap directly at 47u for slightly more low bass.Īnd, try the NFB cap at least as large as 220u (or bigger)-Also try some tiny value polyester caps and/or electrolytic of 0.47uf or less, as bypass caps parallel with your NFB cap. That combination causes it to miss the highest highs and lowest lows, but that is what the datasheet example schematic does. Both the gain and the feedback current may be a bit high and the NFB cap and bootstrap may be a bit small. Well, that's actually a really good result for a basic kit in stock condition. We can extract several items for definition and example with the goal of getting everyone on the same page. in response to a basic TDA7294 kit build. I'm gonna take some time to just not think about the virus or anything else.I'll start by taking advantage of a post by Daniel W. I never imagined beer-virus would do this to me. I talked with the bankruptcy lawyer that set me up with the asset protection plan and he already dropped me as a client. I'm hoping for some bailout money from coronavirus too. I took the five minutes to grab this one final screenshot. I guess they give Portfolio Margin customers a little bit more leeway. Needless to say customer service was horrified and I got another margin phone call to wire in $1,250,000 in the next five minutes or they'd liquidate. Talking with risk management apparently I flew under the radar as they didn't see a margin balance due to the box spread until other account alerts went off as customer service will take a look in when anyone is negative 1 million or more PnL as a courtesy to chat with their clients. Or maybe I'm on reg-t when I took the screenshot, IDK and IDC. Thanks to me UPRO and TMF now are 50% stress tests on TOS, no margin reduction credit, and from 36% and 24% stress tests respectively. Final damage screenshot seconds before account was liquidated:
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