Pro Audio Design Forum

mediatechnology wrote: Kanwar - What are the power supply currents and voltages to obtain 50W?

Hi Wayne,

Rail voltage is +/-32VDC and the Class-A quiescent current is 3.5A per rail

Heatsink temperature was monitored for 65C 1. With Mica Insulators the case temperature was 76-78C 2. With Silicon Pads the case temperature was 82-86C 3. With Aluminum nitride ceramic pads the case temperature was 80-82C 4. With Direct metal mounting the case temperature was 68-70C The case temper...

Thanks for sharing this very interesting work. I understand the thermal advantages of direct-metal mounting. Hypothetically what would be the device temperature difference if the same exact design (at 200W idle) had conventional thermal pads? I suspect that the difference would be significant. It m...

After i gave up I turned the project over to a junior engineer to make a MOSFET studio amp using the easier to design with lateral MOSFETs. Maybe I should have asked you? :lol: :lol: (or cranked in a lot more class A bias to hit a slower part of the transconductance curve) 8-) Thanks for the insigh...

The "driven rail" topology is widely done in low cost designs because the front end can be driven from low voltage rails. There can be issues trying to make a two channel amp since they need separate secondary windings. Yes, it is low cost because the frontend is easy to construct and low...

Agreed, nice work here. Is there any kit like this currently? I seldom look at power amp DIY to know one way or the other. Probably worth exploring if it's not represented in the market. Thanks emrr, Except this, there is no other class-A design/kit like this anywhere in the whole world which is ha...

Very, very nice! Thanks for contributing. You've spent a lot of time on this. The topology reminds me of Cherry's figure 1d: Are you going to offer kits? Thank you for the compliments, Wayne. Yes the figure 1d: is grounded emitter topology and mine is similar in a way which is grounded drain which ...

Hello everyone, I have conceptualized and designed a CLASS-A AMPLIFIER 50W with following features. :ugeek: 1. The mosfet devices are directly mounted on the heatsink without any insulator under it making the thermal performance simply top-notch. The output topology is Grounded Drain. Therefore the ...