AudioCircle

Audio/Video Gear and Systems => The Starting Block / Introductions => Topic started by: BrodaWawa on 5 Aug 2022, 03:41 pm

Title: Hello
Post by: BrodaWawa on 5 Aug 2022, 03:41 pm

Hi . I am Darek from Warsaw. I am self-taught and my hobby is designing and building loudspeakers and amplifiers. Of the latter, I like the Mosfet Single Ended constructions the most, because I managed to design and build some of them (with light bulbs instead of a current source). When it comes to loudspeakers, my first Open Baffles with 15 "Eminence EM15-100 and Oxford 6x9" broadband speakers are about to be built. My workshop has recently acquired a measuring system for loudspeakers and room acoustics, and a router. More and more people are asking me to build speakers, and it takes a long time to make holes by hand so that the speakers are flush with the board. In turn, a professional carpenter counted for 8 holes as much as a milling machine in a supermarket. I hope that the exchange of our knowledge will be very fruitful, and I will gladly try to help everyone as much as I can. Best regards from Poland

Title: Re: Hello
Post by: Blackmore on 5 Aug 2022, 07:27 pm

Welcome to AudioCircle

Title: Re: Hello
Post by: FullRangeMan on 5 Aug 2022, 10:22 pm

Welcome dear FR lover, this is great news.
Please see our FR driver Circle:
https://www.audiocircle.com/index.php?board=128.0

Do you could say us more info on the Mosfet SE amps?
They need a pre-amp?

Title: Re: Hello
Post by: AllanS on 5 Aug 2022, 11:16 pm

Welcome aboard!

Title: Re: Hello
Post by: BrodaWawa on 6 Aug 2022, 12:01 am

(https://www.audiocircle.com/image.php?id=243527)

Title: Re: Hello
Post by: BrodaWawa on 6 Aug 2022, 12:02 am

Heat sinks of this size are sufficient for the IRFP260. During operation, they keep about 60 degrees. The amplifier is over a year old and when using a transformer in the 24V / 16.6A power supply, it gives off about 2x8-10 watts. Unfortunately, with the classic power supply you can hear a slight humming noise, which is why I changed the power supply to pulse 24V / 8.6A. There are no disturbing sounds at the expense of a slight power reduction.

Title: Re: Hello
Post by: FullRangeMan on 6 Aug 2022, 01:18 am

They are run too hot, try use this bigger heatsink.
https://www.rfparts.com/hs100-9-8-heatsink-aluminum-7-x-9-875-x-1-25-no-holes.html
What are the input circuit?
It need a pre-amp?

Title: Re: Hello
Post by: Phil A on 6 Aug 2022, 01:18 am

Welcome!

Title: Re: Hello
Post by: toocool4 on 6 Aug 2022, 11:47 am

Welcome to AudioCircle BrodaWawa

Title: Re: Hello
Post by: ArthurDent on 6 Aug 2022, 01:52 pm

Greetings & Welcome to AC BrodaWaWa   :thumb:

Title: Re: Hello
Post by: BrodaWawa on 7 Aug 2022, 03:30 am

Did someone build "
Single-Ended Regulator Transconductor (SERT) Amplifier"?
(https://www.audiocircle.com/image.php?id=243545)

Title: Re: Hello
Post by: FullRangeMan on 7 Aug 2022, 06:22 pm

Quote from: BrodaWawa on  7 Aug 2022, 03:30 am

Did someone build "
Single-Ended Regulator Transconductor (SERT) Amplifier"?

Nice thanks for posting. I asked if your amp need a pre-amp why I have found the MoFo SE similar to your amp that have no input stage and no gain, so it needs a pre-amp with much gain.
So how much gain have your input stage?
https://www.audiocircle.com/index.php?topic=179626.0