Hey
I am currently designing a class A amp. And I not sure witch power transistor i should use. It's a 30 W push-pull. Are there any good suggestions.
Jimmi
I am currently designing a class A amp. And I not sure witch power transistor i should use. It's a 30 W push-pull. Are there any good suggestions.
Jimmi
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
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
my favorite circuit is the circlotron
http://www.passdiy.com/pdf/Build The Amazing FET Circlotron.pdf
http://www.diyaudio.com/forums/pass-labs/153912-circlotron-meditations.html
http://www.diyaudio.com/forums/solid-state/157015-sumo-amp-schema-here.html
but check out also this threads:
http://www.diyaudio.com/forums/soli...istor-families-audio-power-output-stages.html
http://www.diyaudio.com/forums/soli...ended-integrated-power-amplifier-devices.html
http://www.diyaudio.com/forums/solid-state/154388-its-cheap-its-n-its-dirty-its-circlomos.html
http://www.diyaudio.com/forums/soli...e-ended-related-solid-state-output-stage.html
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