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What causes an amplifier to run hot all the time?
Varney, your unit is likely a Class AB. Class A is a design which keeps a full field current available all the time, and can run quite hot as a result. AB amps will switch modes at a low power output, and usual listeming is in B, which modifies the current according to source.
Why do transistors operate in the lower range?
Note that transistors are designed to operate within a range of temperatures (SOA Safe Operating Area). With the fans, they will be operating in the lower part of the range, and the amplifier will last longer. Also, I used these fans because the amp was sitting too close to the shelf above it.
What does the dissipation rating of a transistor mean?
Here is a quote from Elliot Sound Products: “Under ideal conditions, a transistor’s power dissipation rating refers to the maximum peak power that the device can handle, with the junction temperature at 25° C. At any temperature above 25°, the power is derated (reduced) linearly, until it reaches zero at around 150° C.
Is it possible for an amplifier to overheat?
If spinning the pots left the unit in A far beyond the normal switching point, then yes, you might find evidence of overheating. Always use unsalted butter inside the trout, when audio cooking.Do not turn the fish. I know they run quite warm… NAD/solid state – but this was SO hot, like I said…
What is the power output of a class AB amplifier?
Class AB Amplifier. We have seen that the power output of an amplifier is the product of the voltage and current, (P = V*I) applied to the load, while the power input is the product of the DC voltage and current taken from the power supply.
How are Class A and B amplifiers biased?
Class AB amplifiers can be biased by choosing an operating point along this blue line, excluding the class A and class B biasing points. The choice of its location depends on the desired levels of efficiency and linearity.
When to use negative feedback in class AB amplifiers?
Indeed, a crossover distortion appears in a push-pull configuration and the use of a negative feedback is required to limit this effect. In order to combine both the excellent linearity of class A and the high efficiency of class B, the class AB has been developed.
https://www.youtube.com/watch?v=mzA52uyN_Z4