IRS2092 Class-D Mono Amplifier Board

[r100]

Hi All,

I have a pair of these boards

I hooked up a variable DC power supply like this one rated 0-60V 0-3A but nothing happens... no sound, no clicks, no nothing.

I tried both boards with the same result. So my conclusion is that I am doing something terribly wrong or the boards are DOA. The PSU can supply 50VDC with 3A which should be ok according to the specifications given by certain vendors.



Has anyone had any luck with these boards ?

 

[Piersma]

You need a symmetrical powersupply !

have fun

 

[r100]

sorry for my total ignorance but can you give me an example ? Where can I get one ? Is it even DC ??

 

[nigelwright7557]

Yes you need a dual supply source.
i.e. 12v 0v -12v
The datasheet that came with the module will tell you what voltages the amp needs.
Lets hope you didn't damage the amplifier module.

 

[r100]

These are the Key Parameters for one mono amp.

Power Efficiency: > 90%
Quiescent Supply Current: 20mA
Freq. Response: 20Hz ~ 20KHz
Rated Output Power: 200W @ 4 Ohm

Voltage Range: DC +/- 30 ~ 60V
Recommended Voltage: DC +/- 50V ~ 3A

Unfortunately there is nothing else on the www.

I'm trying to keep the cost down as much as I can. Would this one be suitable ? Or would I need two of them to drive the two mono amps ??

thank's

 

[nigelwright7557]

You would need two wired in series.
But make sure you can put them in series before you buy them.
On some the zero volt is also earthed and you cant serialise them.
The 50 watt power rating is too low, you need two at 100watts each.

 

[r100]

hmm, how about this one ? It has V+ GND V- 48v @ 150W which seem to correspond to the markings on the amp boards (+,GND,-) ?? If ok, can I use one SMPS for both amps ? Thank's

Mean Well RSP-150-48

 

[nigelwright7557]

It only has one output.
You would need 2 of those.
You would need to contact the supplier to see if you can put two in series.

 

[r100]

ok, thanks

 

[r100]

Found this one. It has two output channels 48vDC.

Cincom model CFM201S480
output voltage +48 V (channel I, 4.17A / channel II, 3.13A)

Could this one be ok with both amps ?

Thank's

Amp ratings (one mono amp)
Voltage Range: DC +/- 30 ~ 60V
Recommended Voltage: DC +/- 50V ~ 3A

 

[sweetperfume]

You need supply which can give out +50 and -50 volts reffering to ground. The supply should contain 3 connections 2 ac connections and 1 centre tap which will be ground for both the connections.

 

[panda360]

How about this one?

 

[vacuphile]

The blue potmeter most likely is to set the DC error. Once you get your device to work, measure the DC output voltage, and turn the potmeter till this voltage is lowest.

 

[r100]

ok, thank's. I will get two of Mean Well RS-150-48 PS's. They are the cheapest I could find in CH.

Thank's for the tips.

Will let you know what they sound like but I think I probably grilled one during the trial period

 

[impuls60]

Have anyone tested this card with a 3 ohm load? Could it be modified to handle a 3 ohm load?

 

[Leolabs]

How about this one?

兄弟,this is still a single supply,the ground is the protection ground,taken from main ac supply earth.

 

[r100]

what I dont understand is that it says + GND - on the amp PCB...

 

[vacuphile]

Ground on the amp is not the same as ground on the switcher. In the latter case, it is safety ground only. There is no electrical connection between either + or - and ground. However, the ground on the amp is part of the electrical circuit.

Therefore, in order to make a balanced ps out of two switchers, you connect them just as you would with batteries - you connect the + of one with the - of the other. This connection point will then be what you have to connect to the ground of the amplifier. The open plus of one of the switchers will be connected to the + of the amp, the open minus of the other switcher to the - of the amp.

 

[Leolabs]

what I dont understand is that it says + GND - on the amp PCB...

Here is the sample using linear transformer based:

http://www.circuitstoday.com/wp-content/uploads/2009/07/40v-dual-power-supply.jpg

 

[r100]

Ground on the amp is not the same as ground on the switcher. In the latter case, it is safety ground only. There is no electrical connection between either + or - and ground. However, the ground on the amp is part of the electrical circuit.

Therefore, in order to make a balanced ps out of two switchers, you connect them just as you would with batteries - you connect the + of one with the - of the other. This connection point will then be what you have to connect to the ground of the amplifier. The open plus of one of the switchers will be connected to the + of the amp, the open minus of the other switcher to the - of the amp.

Like this ?