Guest jacj6049 Report post Posted April 3, 2009 (edited) 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 Share this post Link to post Share on other sites
zadrian 0 Report post Posted September 9, 2009 u still interested ? got one......got sysmetics but no parts... Share this post Link to post Share on other sites
dennis28288 0 Report post Posted September 16, 2009 BETA22!!!! Actually, i too want to see if there are more amps to build. Share this post Link to post Share on other sites
Guest jacj6049 Report post Posted September 16, 2009 ha!!thanks guys,jus get me schematic,n i'll try to build Share this post Link to post Share on other sites
zadrian 0 Report post Posted September 22, 2009 [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 Share this post Link to post Share on other sites
zadrian 0 Report post Posted October 4, 2009 ?? anyone ? Share this post Link to post Share on other sites