I've looked back through my posts but can't find who sent me link to buy this amp board, so I have it , came w/o any instructions and two of the connections are only marked in Chinese. Any help on how to use this as a CBG amp would be appreciated!
here is where it came from> http://www.ebay.com/itm/131832286247?_trksid=p2057872.m2749.l2649&a...
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Rather than screwing around with the board, can I make an adapter, like wire a 1/4" mono jack to a 3.5mm stereo plug, and plug it in, so I don't chance frying something with my soldering iron?
yes. just join the L and R from the stereo plug and connect to the tip of the 1/4 jack. ground to ground... easy.
Google translate does a pretty good job. Even a photo of text on a phone can translate pretty good, usually enough to get the point across.
I'd be curious to see any builds with this amp, I ordered one a few weeks ago, probably after seeing the same post you refer to. I am thinking a twin speaker cigar box, I have a couple pc speakers that might work for donors.
not sure if you are still working with this amp or not but I have this same amp by a different seller. go to amazon and search for DROK amp. It's the same amp but all of the markings are in english. It even shows a pic with everything marked up. I had this laying around and tried to use it for a guitar amp as well but like Timothy Hunter said, I don't get much volume at all when hooked up to my CBG. It works great with an MP3 player/phone though. Looks like i need a pre amp
been looking for a cheap prebuilt preamp that would work with this kind of amp but not had much luck. might have to design something myself and design simple circuit board for it. something with about 10 x gain should do it . should there be a tone circuit on there too? or just a clean boost to drive these amps?
David your point #4 is exactly why these amps need a preamp! they are designed to use a line level input which is about 1V peak to peak. a guitar only outputs 0.1 to 0.4 V peak to peak . the result is that the amp is not driven to full volume ever.
found this preamp on ebay last night...http://www.ebay.com.au/itm/191932927311?_trksid=p2060353.m1438.l264...
this amp board looks good as well... http://www.ebay.com.au/itm/232157503355?_trksid=p2060353.m1438.l264...
but this is actually a knock off of the amp board kit i built to rejuvinate and old marathon amp . http://www.ebay.com.au/itm/191736193169?_trksid=p2060353.m1438.l264...
all prices are in AUD so could be cheaper in USD. dont let the chinglish on the last one fool you . it is a 20W mono amp. it does need a -25V,Grnd.+25V power supply though... but thems are real RMS watts not the fake PMPO watts most chinese audio stuff sprouts..
i need to look further into the first preamp but it looks like a simple bass,trebble volume unit.
I was thinking of going this route https://www.cbgitty.com/news/easy-diy-preamp-makes-piezoequipped-ci...
I will use the 2 channel amp and use a 4" sub and 2" mid that i picked up for $5 at Goodwill. I will probably need to build an enclosure, probably cant find a cigar box to fit both speakers. Or i could use this one http://www.ebay.com.au/itm/191932927311?_trksid=p2060353.m1438.l264... (thanks Timothy Hunter) and build it into the enclosure. since it it 12V i could use the same power supply to run the amp and the preamp.
those types of preamp were meant to be installed in the guitar itself. no reason you couldnt put one in the CBG. the CBGitty idea has versatility to it though. keep it in your gig bag and use it if needed...
http://www.ebay.com.au/itm/Complete-Kit-EQ-Pre-Amp-plus-Pickup-for-... has the battery compartment in the box ,has prewired jack and comes with a rod piezo pickup... might have to look into getting on of these next payday.....
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