L30D IRS2092 IRFB 4227 IRAUDAMP9 MYDIY

[mixmasterdjgeneral]

I was referring to the L25 class ab and not the L25D. Ive had many bad experiences with irs2092 boards myself.

 

[Zzalex]

I see I only remember reading reviews about L15 class ab,nothing about L25 ab.

 

[mixmasterdjgeneral]

On second thought when I check the datasheet on the transistors for the L25 I realize they're only 140v, therefore my guess is that it cant go over +-70v. my final option in my opinion is between a PR-800 amplifier board and a irs2092 board I've seen only good reviews online about.

https://www.ebay.com/itm/2843865471...+xxCwJJvVGNal9YMpmKl7Ihsl3|tkp:Bk9SR4yjtqPqYQ

https://www.ebay.com/itm/3840856822...kUZmCf6C9BrY4eAV1iu/4jhQ==|tkp:Bk9SR7T016PqYQ

or does anybody have some good suggestion for amplifier boards to work with my 78v power supply and stable at 4 ohms. Someone here suggested the sure boards but they way over my budget since my currency is very low. $2.8XCD=$1USD

 

[Wieslaw Lipowski]

I see I only remember reading reviews about L15 class ab,nothing about L25 ab.

L15D is ok and reliable and can give up to 300 W to a 4 ohm speaker (or 150 to an 8 ohm speakar). L25D is dedicated for an 8 ohm speaker and can give up to 250W to such a speaker.

 

[Wieslaw Lipowski]

This is the Class D thread, you know.

 

[Audiodesignguide.com]

Here my L25-D

In the first photo work at 55-0-55 without modification and in the second photo work at 70-0-70v with a little modification to limit the hot on some resistors

The 2W resitors has been replaced 5100 -> 2 x 12K in parallel and the 2200 -> 2 x 4700 in parallel

Probably in the future I will try to use the aux outputs of the switchg power supply to generate the +5, -5 and -12v in order to eliminate the hot generated on these resistors.

To drive this H-frame dipole subwoofer

 

[ljm_ljm]

On second thought when I check the datasheet on the transistors for the L25 I realize they're only 140v, therefore my guess is that it cant go over +-70v. my final option in my opinion is between a PR-800 amplifier board and a irs2092 board I've seen only good reviews online about.

https://www.ebay.com/itm/284386547113?hash=item4236c255a9:g:2UQAAOSwenhg~8nj&amdata=enc:AQAHAAAA4PnV2AS/3z3HWNumUROULuRPlh2smE+f+zS39/44UGOh7su8InS2w2Ck2mKrSkmA/OiJ9vImJac0lYUSQIuv4wh8CaTAy2t3s9QfYK9zrgWLEP3NfyR8n8ghMXNFVPxPV2cgYiBvDXnXsI2K3FJsWZS3QD1JX+oU7ZVzdYaXssMTpVgfbgk0AxwdBD2VHF0mZIeqnfJSJwJ0AtQRet/V598dxJsKXg1cz69sLQUMSdLFa3rjXJd00UXhPPi4tdilEn5hA2cjrsF83kFPZ/+xxCwJJvVGNal9YMpmKl7Ihsl3|tkp:Bk9SR4yjtqPqYQ

https://www.ebay.com/itm/384085682206?hash=item596d4a681e:g:UacAAOSwa9dgh-KJ&amdata=enc:AQAHAAAAwBDEPtzGsinws14j6E6bQI75FYbUGrf6LHg5iNgpqWOs1wA6FGF77pTAf6MAA7ehCMMN3tFuI6dQyc/8qKag52YGQR5qqJKBiyLdLoImE2DAxjRTuyqX9iXAaBl6vAG8qQTMYsVO0zG2U+DrB4NZnlJiM1JFL3kHTu3Eq2YawzqAo2kE218/v+WrzCaA/03f2Bcrh+cl6XONRtaTIm4MZeZcahbXBNQLRgd1WkPm2bkUZmCf6C9BrY4eAV1iu/4jhQ==|tkp:Bk9SR7T016PqYQ

or does anybody have some good suggestion for amplifier boards to work with my 78v power supply and stable at 4 ohms. Someone here suggested the sure boards but they way over my budget since my currency is very low. $2.8XCD=$1USD

L20 amplifier can be selected. Not L20D
It is L20 Class AB.
Then choose to use the ONSEMI NJW0302G 0281G transistor version.
You may need to consult the sales merchant.