Miniature Class-D modules

[ArjenShenzhen]

Dear friends,

Many of us enjoy audio outside the house, and build our own portable speakers, for witch class-D as we know is useful because its low battery consumption and high sound quality.

Green and eco friendly is also an issue these days, so i've been thinking what i can do to make the world a little greener, and i've come up with a miniature amp board that has been designed to be used with solar power or (lithium) battery power, with very minimal current consumption.

its a small unit with 2 class-D mono amp IC's and a battery indicator it measures just 5X3.5 CM and is just 1Cm in height, but performs admirably in combination with some nice 2/3/4 inch full range drivers.

i've made some finished speakers of witch ill show some photo's as well.

I hope to get some comments on my own designs, and some new idea's, and that other DIY'ers will post there mini creations.

[katana2112]

Going to sell the amps/boards?

[ArjenShenzhen]

if there is demand, ill produce, this is easy to make for me.

Postings here are more for seeing what other ideas there are, especially in combination with solar im interested what others have done before.

Greetings,

Arjen Helder

[zerokelvin99]

hi, what is the idle power consumption? :-)

[ArjenShenzhen]

hi there, its 10mA Idle, 13mA with the battery indicator ( at full batt, so 4 burning Led's )

[Saturnus]

Originally Posted by ArjenShenzhen

hi there, its 10mA Idle, 13mA with the battery indicator ( at full batt, so 4 burning Led's )

Why not save 25% of idle consumption and use one tri-colour LED for battery status?

[ArjenShenzhen]

Hi there,

Because its soo little, just 3mA for 4 leds, and its separately connected, so an extra pushbutton could also be used to check the batt status, and if i solder the SMD LED's the current is even lower, something like 1.8mA when the amp is producing sound the current is around 100mA for normal sound levels, maybe 200mA ( average, not peak consumption ) at higher levels, so then the batt indication is just 2~4% of the energy consumption, plus that this IC cannot be used to drive just one LED, its a rather simple IC.

[Saturnus]

Btw, passing these of as your designs is not entirely true is it?

They are the design of V-bro from the www.41hz.com forum.

More exactly they're copies of these designs:

http://www.41hz.com/forums/content.p...MP-11-Megamini



http://www.41hz.com/forums/content.p...amp-32-bicycle

[kc7wdg]

Not the first time he has done something like that. He tried to advertise his board in hifimediy's tk2050 thread. Copying is fine but give credit.

[v-bro]

I'm pretty sure that PVC tube speaker can't measure up to my Macaroni, neither will the aluminium box be able to. It'll just turn pale in a shoot out test...

And indeed, I designed these years ago.

Funny man you are Arjen, you do have some pretty nice class D board designs, although I doubt now about what is your own and what not. I recall a TA3020 thread too which you started and presented a board as your own design some time ago, untill some other guy came by which turned out to be the actual designer....

Indeed nobody minds if you copy a design as long as you at least refer to the original. Better well copied than designed poorly, I agree...