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Help in understanding amplifier guts
Help in understanding amplifier guts
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Old 13th October 2017, 11:39 AM   #1
firoo is offline firoo
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Default Help in understanding amplifier guts

Howdy all,

Im wondering if yall can help me read or see and understand amplifier guts, to guesstimate amplifier power.

Like if an amp has 2 IRFZ44Ns at the input vs one that has 4 at the input stage, vs IRFP44s or IRFP54s
Like an amp with A1941/C5198 vs another amp with B688/D718 at the output stage...
When transistor specs say this is used for 70watt audio amplifier do they mean that single trans or both in push pull configuration? Or would they become 140watt capable sincle each is handling one side of the sine wave?

I can research the component specification but would like to know how they relate to the power output... also how they relate to load handling...
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Old 13th October 2017, 12:17 PM   #2
woody is offline woody
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In very general terms that spec sheet was talking about 70w for a pair of those in push pull. One of those devices by itself would have to be run in what is called single ended class A and like that you would have to have a LARGE heatsink to even think about getting 10 watts.
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Old 13th October 2017, 01:48 PM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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In class AB 40% of power gets lost from output transistors in to heat sink as heat.
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Old 16th October 2017, 02:29 PM   #4
firoo is offline firoo
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well sounds like a good start to understand output stage in amps.

what about input stage, when looking at mosfet spec sheets what should i understand from them? their power dissipation or their voltage handling or current draw to understand both how the voltage and power is distributed and how the current can handle lower load.. any quick hand rules that show the above?
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Old 5th November 2017, 04:55 AM   #5
firoo is offline firoo
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When an amp's output transistors are doubled is that twice the power by voltage or half load capable? Twice the current? How can i tell what load it can handle?

If a 4channel amp has 2 A1694 side by side then two C4467s, are they sharing the load (sharing current) or doubling their voltage gain?
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Old 5th November 2017, 05:05 AM   #6
JMFahey is offline JMFahey  Argentina
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Sorry but by the kind of questions you are asking you should better start from 0 studying Electronics and then getting into Amplifiers.

Otherwise youŽll ask 10000 questions yet have no clue about 10001, because youŽll learn them by heart instead of actually lerning how they work.

In the long run, the shortest path.
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Old 5th November 2017, 07:50 AM   #7
firoo is offline firoo
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When the output stage's complementary transistor is next to it vs it's twin next to it, which is doubling voltage output and which is sharing the current?

Just a quick glimpse in seeing high current amp vs high voltage amp
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Old 5th November 2017, 08:12 AM   #8
Perry Babin is offline Perry Babin  United States
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Have you read through the basic car audio electronics site (link below)?
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Old 14th November 2017, 09:10 PM   #9
nigelwright7557 is offline nigelwright7557  United Kingdom
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If a single output pair amp puts out 100 watts into 8 ohms then doubling number of output transistors (without changing voltage) will give you 200 watts into 4 ohms.
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