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 SANKEN Transistor 2SA1295 2SC3264 Match Pair $10.80 Time Remaining: 11d 9h 59m Buy It Now for only: $10.80 |
 SANKEN Transistor 2SA1494 2SC3858 A1494 C3858 Pair $12.99 Time Remaining: 27d 6h 35m Buy It Now for only: $12.99 |
 NAP 140 Classic NAIM CLONE Mono Audio Power Amplifier KIT with Sanken Transistor $56.00 Time Remaining: 3d 8h 45m Buy It Now for only: $56.00 |
what does this circuit diagram of 1000w means to use how many transistors?
Sanken 8 to 16 pieces of transistors & Is this circuit correct http://www.afiata.com/1000w-2000w-power-amp-ocl-circuit-using-sanken/ to drive a woofer & how many & what transistors to use.
It's incomplete.
Certainly you would need more than the schematic shows to run 1000 watts, since a single 2sa1494/2sc3858 pair is good for 200 watts as an "absolute maximum" rating (from the spec sheets).
But you can't fix that by just hooking a bunch of them up in parallel. You would have to very carefully match them, and even after that, you have to do some extra work to avoid oscillation and other issues.
Also, the schematic calls for a +/- 30 volt power supply. I assume that this is for a car? To provide 1000 watts output at 25 percent efficiency (not uncommon) that supply would have to have a current rating of at least 70 amps. A +/- 30 volt, 70 amp supply that works from 12 volts in is not an easy job either.
And even after those issues are addressed, there are hidden pitfalls in high power audio amp construction.
I'm sorry, but I would suggest that a 1000 watt power amp is not really a good DIY project when the construction details offered are so sparse. An experienced audio amp DIYer would be able to take the schematic and implement it safely and would also have power supply circuits handy.
If I were you I would go to some of the audio DIY web sites and forums and start reading. Then build something simple and low power that will not start a fire if a part fails... like a headphone amp. Next try a power amp that runs on 12 to 14 volts, no negative supply needed, maybe from a kit.
Kits are a good way to learn construction techniques. You don't learn a lot about circuit topology from building a kit, but running someone else's physical designs through your hands really shows you things you need to know about construction techniques. And you avoid spending a whole lot of time collecting parts from various sources; you also avoid compromising when you can't find the exact parts you wanted.
Sanken