Hi Jan,
I've used these delay on relay module (from Amazon) to turn on five monoblock amps in sequence, and everything works fine.
The trimmer is a 25 turns potentiometer, turning it clockwise increases the delay time, and turning it counterclockwise decreases the delay.
Maybe you could try replacing the trimmer and capacitor and see if that works.🤞
I found that mono speaker protection board online which I believe is a regular 1237 board with a PCB design to fit over the amp output terminals/binding posts. I think it might suit your needs since you're assembling a subwoofer amp.🙂
I've used these delay on relay module (from Amazon) to turn on five monoblock amps in sequence, and everything works fine.
The trimmer is a 25 turns potentiometer, turning it clockwise increases the delay time, and turning it counterclockwise decreases the delay.
Maybe you could try replacing the trimmer and capacitor and see if that works.🤞
I found that mono speaker protection board online which I believe is a regular 1237 board with a PCB design to fit over the amp output terminals/binding posts. I think it might suit your needs since you're assembling a subwoofer amp.🙂
Hi Chris,
I've used this delay module on another build to switch the mute function of the TDA8954 https://nl.aliexpress.com/item/1005...!sea!NL!161642597!&curPageLogUid=pAVQYTrqMEwN
Modified, following Faux Frence' mods in this thread: https://www.diyaudio.com/community/threads/tda8954th-btl-amplifier.333317/#post-6403183
This board worked right out of the bag...
I contacted the seller of the one that immediately closes the relay while both LEDs remain lit indefinately, once power is applied; they want me to make a video as 'proof' for a refund.
Making the video is more work than ordering a new one...
I'll look into replacing the trimmer and 100nF capacitor.
Regards, Jan.
I've used this delay module on another build to switch the mute function of the TDA8954 https://nl.aliexpress.com/item/1005...!sea!NL!161642597!&curPageLogUid=pAVQYTrqMEwN
Modified, following Faux Frence' mods in this thread: https://www.diyaudio.com/community/threads/tda8954th-btl-amplifier.333317/#post-6403183
This board worked right out of the bag...
I contacted the seller of the one that immediately closes the relay while both LEDs remain lit indefinately, once power is applied; they want me to make a video as 'proof' for a refund.
Making the video is more work than ordering a new one...
I'll look into replacing the trimmer and 100nF capacitor.
Regards, Jan.
Got everything in position, more or less:
The only things bolted down are the toroid and the aluminum L-bracket that holds the TDA board.
Not having a milling machine, I had to fill out the ridges in the aluminum housing, getting that to fit took the bulk of my time today.
The rest was rather straight forward; cleaning up the wiring not used anymore (second life for the housing) and wiring up the other components, like the 12V DC 1A buck down powering the filterboard and bolting in the filterboard itself.
After checking for shorts and other possible mishaps, the power was turned on, with a big thump it came to life and has been playing all afternoon:
The aluminum bracket has been bolted to the bottom of the casing with a smear of heatconducting paste in between the parts and doesn't get over 28,6°C, powering my 8 Ohm bandpass sub under the desk.
So far so good, now I have to wait for the seller to send me a working relay board, or try fixing the one I have at hand.
Here's a small video:
Powered by my regulated power supply at 12V, both LEDs light up and go out when the power is cut, no timer function whatsoever, the relay closes immediately, hence the multimeter beeping all the time...
Regards, Jan.
The only things bolted down are the toroid and the aluminum L-bracket that holds the TDA board.
Not having a milling machine, I had to fill out the ridges in the aluminum housing, getting that to fit took the bulk of my time today.
The rest was rather straight forward; cleaning up the wiring not used anymore (second life for the housing) and wiring up the other components, like the 12V DC 1A buck down powering the filterboard and bolting in the filterboard itself.
After checking for shorts and other possible mishaps, the power was turned on, with a big thump it came to life and has been playing all afternoon:
The aluminum bracket has been bolted to the bottom of the casing with a smear of heatconducting paste in between the parts and doesn't get over 28,6°C, powering my 8 Ohm bandpass sub under the desk.
So far so good, now I have to wait for the seller to send me a working relay board, or try fixing the one I have at hand.
Here's a small video:
Regards, Jan.