jus wanna build more portable amps

[Guest jacj6049]

hi all,can intro some portable amp for diy?if can,pls giv me the schematic(but all parts must be can easy to get in sg)ha,i ored build a mini^3,so wanna try out some more

 

regards,

Edited April 6, 2009 by jacj6049

[zadrian 0]

u still interested ? got one......got sysmetics but no parts...

[dennis28288 0]

BETA22!!!! Actually, i too want to see if there are more amps to build.

[Guest jacj6049]

ha!!thanks guys,jus get me schematic,n i'll try to build

[zadrian 0]

[attachmentid=4204]

 

Heres the schematic,so you will know whats required.

 

 

 

Audio

-all three opamps take input from one source, from the mini jack input.

 

-three volume controls, each with amplifier capable of delivering enough power to headphones, or use as a pre-amp for speakers.

 

-optional bass-boost. for no bassboost, just short output to r4, hence the switch.

 

-use ic sockets, so user can change opamps, take note some opamps cannot run under 5v from usb.

 

Power Supply

- technically usb supplies 5v @ 500ma, more like 300ma in real life, still its enough to power the amp.

 

-three TLE2426CLP, one for each amp, basically its a separate buffered powersupply for each opamp.

 

-1000uf is quite enough, to save costs u can go down to about 470uf, the more capacitance the merrier.

 

-0.1uf decoupling capacitors, important to maintain stability of opamp.

Pre_amp.bmp

[zadrian 0]

?? anyone ?