Need DIY amp trigger

[ViolenceOnTheRadio]

I have a 4 channel tripath amp.
Lots of juice and they're cheap but, no trigger for turning on/off with the car's head unit. Obviously I can't let it vampire energy off the battery while I'm not in the car so I was hoping there is a simple way to add a trigger.
Can I just use a relay or will I cook the thing due to the current the amp will draw through it?

[Perry Babin]

Amplifiers are typically switched through the switching power supply control IC.

[ViolenceOnTheRadio]

Unfortunately I've been unable to decipher which chip pin it is due to the data sheets varying the generation of chips that have been produced under the TK2050. It's the 4 channel x 100 watt version with 40 pins, 42 if you count the 2 clipped off by the manufacturer.



One of these babies. Class D digital.
The PDF's are really crummy in terms of accuracy.
Anyone familiar with these and aware of which pin I need to tap?
Can't believe the quality of these yet the manufacturers don't bother with thermal paste. Also quite stupid that they don't include a terminal for remote power switching.

[Perry Babin]

Are you using the 12v from the battery only or do you have a switching power supply?

Do you have a link to the site where you purchased these (or somewhere that more information can be found)?

[ViolenceOnTheRadio]

They're on Ebay under TK2050 and a few dozen other sites. It's become a very popular board since it's complete and you only need to house it and power it, the power board also being built in. I found the proper schematic finally and it's power pin shunts to ground through a resistor. For about $40 shipped, you can buy a 2 channel x 100 watt or 4 channel x 100 watt version.
Pretty amazing considering that though it turns out it's digital, it's Class D and they sound outstanding.

As I already mentioned, it's going to go in my car so it will be powered by 12/14.4 volts from the battery/alternator. I went ahead and found a relay for 6 bucks at Radioshack which can handle 30 amps of current flow. A much easier and safer solution than trying to bother with a ground break relay and desoldering the pin. Thanks for the interest though

[Perry Babin]

This amp will only produce ~20w/channel into 4 ohms without a switching power supply.

[ViolenceOnTheRadio]

Do you need binoculars to look at the board??

[Andrew Eckhardt]

VOTR, Perry Babin is the house car amp genius.

You might want to readvise yourself of his last post.

I'm not sure, but there is likely no true disable mode on that amplifer. As Perry said, the controlling of power is usually done in a switching controller inside real car amps. The thing you're looking for could be very hard to find if it ain't there.

Here's a plan:

http://www.allelectronics.com/mas_as...524,sws_10.jpg

[ViolenceOnTheRadio]

Your guru couldn't even suggest I get a 12 volt relay which is the obvious solution. That is a CLass D digital amp, it's efficiency isn't power supply dependent. It's a Tripath. He didn't know anything about it after I gave him the chip number which seems incredibly odd considering the popularity. I am aware of his claim but it's wrong.

[Perry Babin]

I think the relay would cause the amp to have a turn-on/off pop.

Pin 25 is a shutdown input.

What type of speakers are you going to use with this (full range, subs...)?

What is the impedance of the speakers?

If they're subwoofers, are they DVC? If so, what's the impedance of each coil?