Amplifier Auto-detect amp?

Koen · 22nd November 2007, 21:25

I'm sure it is technically possible to make an amplifier that can detect whether or not there is an input signal, to switch itslf on and off. This would make a "remote" signal (which we don't have in our head unit) obsolete.
Does anyone know if such amps exist? Or do I have to make such thing myself?

K.

Max · 23rd November 2007, 09:18

They do exist, for instance from Blaupunt. They have a subwoofer with integrated amp that swiches on and off automatically, type THB200A. Since we don't have a line-out as well, you can use a spekerconnection to feed it.

ukpm · 23rd November 2007, 11:32

You could get one the clever clogs ppl on here to make a curcuit that would activate a relay for the amp when the ignition was on or the headunit was powered up, for example. It might even be able to use the amps own remote trigger somehow.

dougl65 · 23rd November 2007, 12:37

It's simple: just connect the power from your boot mounted socket to the amps remote turn on. The amp only comes on when the ignition is on!

Koen · 24th November 2007, 22:42

That's an option, but even when the head unit is off, the sub would be powered.
Some time ago I made a 4 stage active sub filter myself, than added a (delayed) remote activated relay and had a print made. If I have to add this detection circuit, that would mean starting from scratch with the whole layout. And it's maybe cheaper to buy a complete amp in the first place. Not as much fun however.

I intend to build the speaker cabinet myself. It's gonne be a well balanced 6th order bandpass design. +110 dB from 60 watts into 8 ohm. No commercial product comes close...

At the moment, the whole project still looks like this:

K.

robbo51 · 25th November 2007, 08:08

Quote:

Originally Posted by Koen

That's an option, but even when the head unit is off, the sub would be powered.
Some time ago I made a 4 stage active sub filter myself, than added a (delayed) remote activated relay and had a print made. If I have to add this detection circuit, that would mean starting from scratch with the whole layout. And it's maybe cheaper to buy a complete amp in the first place. Not as much fun however.

I intend to build the speaker cabinet myself. It's gonne be a well balanced 6th order bandpass design. +110 dB from 60 watts into 8 ohm. No commercial product comes close...

At the moment, the whole project still looks like this:

K.

It looks abit untidy Koen!!

How do you fit the shopping in as well??

Koen · 25th November 2007, 14:00

Shopping? Isn't that the woman's worry?

BTW, the only thing that is missing is a bit of wood and some black carpet. And few hours time...

(That's where the real problem is...)

K.

22nd November 2007, 21:25	#1 (permalink)
Koen Supporter Triangular Exhaust Join Date: 18th September 2007 Location: Belgium Posts: 238 Thanks: 0 Thanked 0 Times in 0 Posts	Auto-detect amp? I'm sure it is technically possible to make an amplifier that can detect whether or not there is an input signal, to switch itslf on and off. This would make a "remote" signal (which we don't have in our head unit) obsolete. Does anyone know if such amps exist? Or do I have to make such thing myself? K.

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This thread is about: Auto-detect amp?, it's in Ipods, MP3 Players and ICE at the Honda Civic forum Civinfo; I'm sure it is technically possible to make an amplifier that can detect whether or not there is an input signal, to switch itslf on ...

23rd November 2007, 09:18	#2 (permalink)
Max Valve Cap Join Date: 12th June 2007 Location: Zutphen, Netherlands Posts: 6 Thanks: 0 Thanked 0 Times in 0 Posts	They do exist, for instance from Blaupunt. They have a subwoofer with integrated amp that swiches on and off automatically, type THB200A. Since we don't have a line-out as well, you can use a spekerconnection to feed it.

23rd November 2007, 11:32	#3 (permalink)
ukpm Wheelnut Join Date: 17th April 2007 Location: Holywood, Co. Down Posts: 93 Thanks: 0 Thanked 0 Times in 0 Posts	You could get one the clever clogs ppl on here to make a curcuit that would activate a relay for the amp when the ignition was on or the headunit was powered up, for example. It might even be able to use the amps own remote trigger somehow.

23rd November 2007, 12:37	#4 (permalink)
dougl65 Supporter Wheelnut Join Date: 18th October 2007 Location: Wanstead, London Posts: 60 Thanks: 0 Thanked 0 Times in 0 Posts	It's simple: just connect the power from your boot mounted socket to the amps remote turn on. The amp only comes on when the ignition is on!

25th November 2007, 14:00	#7 (permalink)
Koen Supporter Triangular Exhaust Join Date: 18th September 2007 Location: Belgium Posts: 238 Thanks: 0 Thanked 0 Times in 0 Posts	Shopping? Isn't that the woman's worry? BTW, the only thing that is missing is a bit of wood and some black carpet. And few hours time... (That's where the real problem is...) K.