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Keep an eye out for the power adapter, it takes a center positive power adapter, as opposed to most pedals! I was also told by Ty not to modify the wiring at the board to a center negative.
That was my understanding as well...like I mentioned, I think amperage is only "supplied" as the device demands it...ish.
I wasn't asking about the role of amperage vs voltage, I was asking for help having thought I fried the amp. I have since found out that the battery connection is strictly for 9 volt only and that the external power supply connection should be used for a12 volt supply (regardless of amperage). Whats more I have been given help in terms of what to investigate (ie capacitors).
I was unsure of what happened, why, what I had done wrong, what I had assumed incorrectly and correctly and what routes for resolving my problem were available to me. I asked for help with these matters and received it here and from the supplier.
It sounds like you have taken offense somehow. Hmmmm.....
Thank you to those of you who offered advice and support. Its a great help to discuss these matters and work through the possibilities, I really appreciate it. I'm sorry if I rubbed anyone up the wrong way...wow.
I should of said a 9volt battery has a capacity of about 500mAh and an max output current of about 1/3 an amp. Sorry to hear your mistake I have burned my share of chips. Make sure if you use a power supply you use the recommended mA you don't want to use to low of mA. And just because it says it will handle 15v isn't always the best thing this generates heat you don't want heat. .
Interesting, sorry to hear about the fried amps. I was think about running 12V into my Ruby amp with a 386 chip but wonder now if I should not, or if I need to connect it to a different point on the board?
I have been using the LM386 N1 chips (nominally 4v - 12v ) in my amps - I have used them w/ a "12v" car cord on the boat while the shore powered charger was on - usually about 13v with no problem. I do use the socket for the chip, so if I fry one (haven't yet thru the 1st 6 amps) it is a 75 cent no solder swap out.
Good topic Tom, sorry to hear about the amps. Thanks for sharing as it helps the guys like me that are still on the learning curve so to speak, it's threads like these that a guy like me can learn a thing or 2. Hopefully the amps can be salvaged, good luck and hope it all turns out right for ya. I'll keep an eye on the thread to see the remody.
Well, one amp still lives via the external power supply jack. I wired in my 12v battery into the wiring for the jack socket and all is well. The 9 volt battery input is dead. I'm thinking a capacitor may well have blown but to be honest I'm not gonna mess with it anymore, it works and I'm happy. That 12 volt battery should run the amp for hours and it's rechargable so I will pop that into the amp box and and have a connector for it's charger...done.
The other amp is still dead no matter what power input I use and schematics aren't available so it goes into the file marked "spares from lessons learned".
All of this aside the amp itself sounds great with an 153X 100MM 4W 8 OHM general purpose elliptical speaker. I'm getting a 4 watt, 8 OHM round, 125mm GP speaker soon and will try that to see what the difference is.
Thanks all.
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