current ratings for Amp1

[fossilfool]

Dear Audio headz:

What's the average current rating for an Amp1 running at 36-40V?

I'm trying to calculate what size rechargeable batteries to use.

Thanks,

Paul

[omishra]

Maximum voltage recommonded for AMP1 is +-36VDC, I suggest don't go near to that. You may break the chip.

As per TA2022 datasheet
Typical voltage +-31VDC for 4ohm load
and +-33VDC for 8ohm load
Current around 4.5 Amps for each source (+ and -)

[bearman]

You do realize that you need a dual power supply to run a AMP1?

[fossilfool]

No, I didn't realize I needed a dual supply. I am planning on running it off batteries. Would I need two separate 36 volt batteries? That seems too difficult, since each battery already has 28 cells.

My question was about the current ratings. What is the average current or average power going to the amp? (Total current for both power supplies.)

I know it's a 100 watt amp, and the amp is supposed to be 90% efficient. Does this mean that there is 2.7 amps going to the amp? (100 watts / 36 volts.) Or is the number higher or lower than that?

Thanks,
Paul

[bearman]

Not only do you need a Dual 28-32v supply, you also need a very well regulated 5 volt supply also.

You should try the AMP6. It's much easier to use with battery supplies.

[fossilfool]

I tried Amp3 (which is the same power as Amp 6). I thought it wasn't loud enough for my application.

You see, unlike other members of this community, I am not an audiophile. I produce sound systems for bicycles. (http://fossilfool.com/soul-cycle/soul-cycle.htm) Our 'listening room' is the streets of San Francisco. My hope with using 41hz kits is to find a small amp that produces big sound from a small battery.

The Amp3 and the SI T-amp are barely loud enough for cruising with music on a bicycle. If small bookshelves are used, it doesn't cut it volume-wise. A 50-watt per channel amp would be better, and a 100-watt per channel amp would allow enough headroom to satisfy our needs.

As far as the AMP1 is concerned, I can supply a stable 5V using a voltage limiting IC chip in series with a 6V battery. But I still don't quite understand... Would I need two or one 24-36 volt batteries?

Thanks,

Paul

[fossilfool]

Thanks for the explanation.

So we're looking at two 24-36 volt batteries, plus one voltage-regulated 5v battery. It seems doable, but that's a lot of cells to think about, and individual cells often do go bad. Then you have to undo the whole pack to replace one cell.

Let me ask you a theory question. Is there anything about the class-T architecture that prevents you from getting 100 watts per channel out of a simple 12-Volt DC supply?

Thanks,

Paul

[panomaniac]

It's not the T-Amp, it's the 12 Volts. It limits you to about 15 watts, max.

Automotive units need a step up power supply to get higher powers. They chop the 12 VDC , run it through a transfomer to increase voltage, then turn it back into DC. Often at +/- 30 volts or more.

Automotive stuff is going to be your best bet it you have to run high power off batteries. The trouble will be finding an efficent one. The step-up process uses power itself, apart from the amp.

Aloha
MM

[Sean]

Attache an alternator to the back tire :D.