8/16W TIP3055 class A for POWER WASTING

[mosfet54]

It outputs 0.050% THD @20kHz and full power (+-8.8V output) 8W power (16W peak) -> 12W average.
It outputs 0.010% THD @20khz and 6.6W power.
It outputs 0.006% ..... @20kHz and 1/4 power (...................) 2W power (4W peak) -> 3W average.

need 1-2 more pairs for full +-20v output.

There are two FFTs attached. They are both @20kHz.

P.S. What transistors to use instead TIP3055/2955 ?

 

[mosfet54]

simplified sch, DC offset 4mV !

 

[mosfet54]

123

 

[dogshome]

It's cold for this time of year. Class A all the way!

 

[jerluwoo]

Need to implement a way to control the current through the output. As is, it will continue increasing current with temperature and self destruct.

 

[mosfet54]

D6 for Q2 and D4 for Q3. They are thermotrakers.
Actually I am wondering for Q1 ? Does it need a thermotrak ?

It's cold for this time of year. Class A all the way!

heheh class a for the winter hahah Class A from the beginning to the end.

 

[mosfet54]

D6 was error and Q1 dont need thermotraking ! If there are D6 it will do the opposite.
LTP does the job for Q1 and Q2, D4 for Q3.

Im attaching a new sch with added another pair of power transistors, removed D6 and output power of 30 Watts.

new specs -> THD @ 30 Watts and 20kHz == 0.014% ,
its perfect for my transformer since it needs 184W, im having 260

i was afraid i will run out of power cool

But hey this is only one channel not cool
Can I use 368W with 260W tranformer ? If I cant I will make it Mono amp with 2 audio inputs and output speakers paralleled.

This is "Monster A"

 

[jfetter]

cryo cooling

It's cold for this time of year. Class A all the way!

I'm still intrigued by some sort of liquid cooling. Its been covered on the forum but I don't really see any breakthrough.

Will check the old expired patents on Google patent search.


An Overview of Liquid Coolants for Electronics Cooling Electronics Cooling Magazine – Focused on Thermal Management, TIMs, Fans, Heat Sinks, CFD Software, LEDs/Lighting

This link has a lot of basic info.

 

[JonSnell Electronic]

If you do not thermally connect the bias diodes to the heat sink, it will destroy itself! Place a 0.1R 2W resistor in the emitters of the output transistors, that will help with heat regulation.