i built a battery powered minamp using some car speakers , a sure tda 2024 15 watt tripath stereo amp . the "front end" is a korg pandora x5 . anyway i am a little surprised that it isn't as loud as i had imagined it would be . looking around i saw about impedance mismatching when you plug an ipod into a stereo . this lead me to ponder that perhaps if i had some sort of boost circuit between the pandora and the tda tripath amp it would perform much better (loud) .
i have monkeyed around and read a little about boosters so i ended up building an oorman mosfet bost . i also saw on beavis hifi he had a jfet circuit for ipod to stereo . anyone famaliar with this conundrum ? any recommendations ? ideally it would be quiet , provide the right range of gain (i know) not use too much power , and sound great (hah) , i am impressed with the pandora sound quality , it is pretty loud but i really think something in between will set this thing off like a rocket . i have some mini speakers i could chop that circuit in , also a circuit from some pc speakers that has a headphone jack , but thats in my cbg ....
as far as powering goes the amp has a 12 volt sla , and internal ac power supplies/dc regulators for 4.5 volts , 9 , and 12 . so i can run it ac or dc . it also powers the sustainer in my fernandes thru a custom hacked mic cable that carries 9 volts to the guitar .
i can not access the bevis hifi site , curious if someone had that page (jfet ipod pre) or schmo saved , a vero would be a dream come true ! another option may be a mini headphone amp (ipod booster) , i have seen those too , but not sure . realize this is an oddball , but figured it wouldn't hurt to ask . (sorry i am not an EE , i am a goof) i just figured maybe someone had been thru something similar and could maybe point me in the right direction so i can save time , being disabled with this chronic back pain sucks . it kinda makes me want to cut the tinker time down if i can .
i can post more info about the pandora and the actual amp if needed , i am uploading a huge video to YT right now so bandwidth is tight ....
should i try and measure the output of the pandora and then see if i can get specs for the tripath amp to see how much headroom i have ?
thanks in advance for any feedback , ideas , or insults directed towards my lethargy and (lack of) intelligence !!
my latest home made amplifier . stereo , 30 watt , built in ac adapters and also a selaed lead acid 12 volt battery for LONG play . the "front end" is a korg pandora . i got the speaker box on craigslist free section . this puppy sounds sooo sweet ! its loud too . 6 inch sony xplode automotive speakers i got free , thanks Ken and Nancy !!!!! the amp is a ta2024 from ebay ... i may cut in an effects loop , but , i dont know if i need it yet . have to do some patch editing on the pandora , it has usb and patch software yahooo !
this was a super fun project , thanks to my wife and kids who did most of the work . i pace around , drinking / farting and cursng a lot . they didnt get too many splinters but my kid got a really bad solder burn on her face .
this guy John Wilson contacted me (i dont know him) and asked if i would "beta test" his amp kit instructions . its a 1-2 watt battery powered "mini" amp kit . i used a 6 inch speaker / 9 volts . high quality pcb , great kit , great amp , it gets a sweet clean tone .
the second part has a circuit bent speak n math and this goofy lil noise maker called a slider synth (dino segovis) . the slide synth was the circuit that broke my heart for a month or so !
i do want a better speaker for this lil amp , but other than that it turned out way better sounding than i thought . the smaller drivers give enough high end to enable a mic to run thru it and sound great , and it has 2 inputs .
my 3rd diy battery powered mini amp with built in effects . this one has three , a flanger , distortion , and a uni-vibe clone . this was the most challenging project i ever tried . it took a very VERY long time to complete and its super tight inside the chassis . i think it was around 5 weeks total build time , i mean i worked on it every night , some evenings went into the next morning . i did run into one very odd problem , but fortunately figured that out in less than an hour . i think i broke around a dozen drill bits , it has just under a hundred holes in the chassis .
enjoy , part one i talk , part 2 i play thru it a lil :
a little larger , but i like the tone , i will add a distortion circuit to this eventually , on the second channel maybe . the amp board came out of a karoake machine i got super cheap at salvation army . the delay is modified for longer echo . this was a very fun / pretty simple project , a great idea for a beginner to get their feet wet , also , really cheap .
i realize i did not build this from scratch so it doesn't qualify as much , but it was a fun starter project . the amp circuit was taken from a kiddie tape deck that had a lil plastic mic . i added a chorus circuit that i removed from a dano pedal , then a delay that i modified a little bit .
the video has 2 parts , part one i talk about it , part two i try and play a little bit thru it .
i only use 2 fingers to fret cause of a lawnmower accident when i was a kid .