Hi ,
I am using an audio amplifier of transistor 2N3055 .It uses two transistors for one channel and 4 for two channel amp.I have two channel amp with 4 transistors and using it with computer.The woffers used are one is 10 inches and other is 12 inches .I want to increase the power of amp.What i shoud do ? i am using 12-0-12 ,1A transformer.Help me to inprove its performance.........
Hi, Sahil. Sadly, you can't increase the performance of your amplifier by replacing the two output transistors. A higher voltage transformer won't do the trick, either. All that will do is make the transistors run hotter, and possibly burn them out.
If you need more power, you might look at getting another amp.
Good luck Chris
More power means more volts and more current. You could put beefier transistors that handle twice the current and run 4 ohm speakers instead of 8, but this assumes that the guy that specified how many watts in the transformer was an idiot and bought a transformer that was twice as big as what was needed just in case you might need some spare power. Not likely. The transformer isnt going to magically start producing 200 watts if it was designed to have just enough iron and copper to produce 100 watts. So once you change the transformer and the output transistors, you have rebuilt the whole amp.
More power means more volts and more current. You could put beefier transistors that handle twice the current and run 4 ohm speakers instead of 8, but this assumes that the guy that specified how many watts in the transformer was an idiot and bought a transformer that was twice as big as what was needed just in case you might need some spare power. Not likely. The transformer isnt going to magically start producing 200 watts if it was designed to have just enough iron and copper to produce 100 watts. So once you change the transformer and the output transistors, you have rebuilt the whole amp.
You need to redesign the amplifier and rebuild it. Simple changes of parts won't alter the performance.
get a bigger amp and speakers.
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Provided 2N3055s have enough heatsinking, they're easily capable of 50W output.
Graham
Depending on the design of the amp and other devices used, you simply need to increase the supply voltage.
A 24-0-24 supply would increase the power output by around 4 times.
It's essnetial to provide good heatsinking though and all the active and passive devices need to be rated for adequate voltage and dissipation when working at the higher voltage.
The general design of the amp would need to be looked at too to ensure there were no general issues at the higher voltage but this would often only amount to a few component value changes at most.
These ppl who simply say 'it can't work' are talking nonsense btw.
Graham
2n3055s can take 60 volts, so a higher rail to rail supply would double the output, if the first stages are fed at the right voltages. The old 40411 version was good for 100 volts, and used in a lot of early 60 Watt audio amps in a quasi complementary circuit. RCA published a number of different schematics for different power levels for these types amps in their transistor data books all through the '70s.
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