zadrian
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Posts posted by zadrian
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[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.
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u still interested ? got one......got sysmetics but no parts...
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Hi, I would like to know if there are any persons here that helps to customize amps ?
I could not find an amp to match my requirments
1) 3x Outputs with individual volume control
2) runs on USB (no need to be portable or can run w/o batt)
3) input by mini-plug (interconnect) or USB (as a DAC for PC)
4) bass boost (optional)
5) no need room for opt amps etc.....
Budget below SGD200 if possible
jus wanna build more portable amps
in DIY Section
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?? anyone ?