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9th January 2010, 04:31 AM
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#2 |
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diyAudio Member
Join Date: Jan 2010
Location: California and Michigan
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JIM:
Class A, is a great goal. But it is not a cheap one. There are all types of BJTs to use for your design. The question you should be asking yourself is "how much money/funds you are willing to part with". Class A and be inexpensive or expensive. It is up to you. Transistors 2N3055A 2N3772 MJ15015 MJ15022 I use the 2N5303. It is costly. But the ones I have, were given to me by a company that was throwing 100s of them away. I have 70 each left. No they are not sale. But will trade for Hitachi Mosfets. I recommend that you visit ESP, he has some designs and information on designing and building Class A power amps. It may save you time, money, and headaches. 30 Watts of Class A requires a lot of heat sink area. Heat sinks are costly if you do not know how to heat sink Class A power amp above 10 watts. If you do not know how to make your own heat sink, you are looking at a high cost item. Aluminum is not cheap. And forged aluminum is really not cheap. My power Class A are big Mono units. Pumping out 70 watts of power. The transformers are all hand wound from discarded welders, I picked up and rewind. The front section uses 2N3440/2N5415, and the drivers are doubled pumped 2N3439/2N5416. Gain is set at 22K. Power Supply is 45 -/+ at 10amps per channel. Caps are Photos at 330uf/100v. To form a dual bank of 24 per channel. For a total of 4000uf per level. 8000uf total. Heat Sinks are home made out of T bar stock and U formed 1/8" plate aluminum. The design is in Amateur Radio Handbook. Ok Jim Take Care. Hope to hear from you Ivey |
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9th January 2010, 03:18 PM
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#3 |
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diyAudio Member
Join Date: Nov 2009
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Find out what Sugden uses in the A21.
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9th January 2010, 05:30 PM
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#4 | |
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diyAudio Member
Join Date: Jul 2005
Location: D-55629 Schwarzerden
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Quote:
http://www.passdiy.com/pdf/Build%20T...Circlotron.pdf Circlotron Meditations sumo amp schema here but check out also this threads: bipolar (bjt) transistor families for audio power output stages URL Collection of Commercial Single Ended Integrated and Power Amplifier Devices It's cheap, it's N, it's dirty, it's.... The CIRCLOMOS!!! URL collection of Totem Pole and CSPP (Single Ended related) Solid State Output Stage |
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Power transistor for class A amp
