Hoffman Amplifiers Tube Amplifier Forum

Other Stuff => Solid State => Topic started by: dpm309 on November 17, 2023, 03:24:33 pm

Title: Speaker Turn-On Delay
Post by: dpm309 on November 17, 2023, 03:24:33 pm

Looking at installing a Speaker Turn-On Delay board for a Trace Elliot AH150 bass amp. Here is the link to the product page:  https://diyaudiostore.com/products/soft-start-speaker-turn-on-delay-and-dc-protector-boards?_pos=1&_sid=6f035846d&_ss=rIt 
I need a 12 or 24 V power supply for the board and I do not want to have to install a separate transformer. I need the schematic for the AH150 and have not been able to find it anywhere. Does anyone have this schematic? Also, it looks like the board is for stereo amps. Can I just jumper the speaker in/outs together? Here is the schematic: https://cdn.shopify.com/s/files/1/1006/5046/files/Speaker_Protection_Board_Schematic.jpg
Thanks,Dan

Title: Re: Speaker Turn-On Delay
Post by: PRR on November 17, 2023, 04:35:24 pm

How someone else did it, with mods for 20V to 70V supply:

https://www.siliconchip.com.au/Issue/2011/October/Build+A+Loudspeaker+Protector

Douglas Self had a well-considered plan but it is not in the 2002 edition of his Power Amp book.

Title: Re: Speaker Turn-On Delay
Post by: dpm309 on November 17, 2023, 05:11:44 pm

Thanks, PRR. I'll check it out.

Title: Re: Speaker Turn-On Delay
Post by: PRR on November 17, 2023, 05:27:07 pm

.

Title: Re: Speaker Turn-On Delay
Post by: PRR on November 17, 2023, 05:30:50 pm

Also ESP:
https://sound-au.com/project33.htm