Hi,
I joined here a while back but haven't done much electronics since then. I've got the bug again and breadboarded up a small amp based on a AN7511 chip. I read about in a silicon chip mag - "The Champion" is what they called. Its a 1-3w amp depending on voltage. Its their update to the long running "Champ" kit which was based on lm386.
Anyways I just breadboarded the stock standard amp as per the panasonic technical data sheet http://www.semicon.panasonic.co.jp/ds4/AN7511_BEB_discon.pdf
I bought a couple chips at Jaycar.
The stock amp sounds fairly nice on the breadboard but clips a bit harshly when you dig into the strings a bit.
My plan was hook up a runoffgroove fetzer valve as a preamp and see how it would improve things.
The Fetzer is working nicely on its own bread board and the An7511 amp is working nicely on its own breadboard. But when i take the output from the fetzer and insert into the Amp - I get weird oscillations only - kind of like a synth. When I turn the volume pot on the fetter i get a frequency/pitch change of the noise.
Anyone have any idea of what is going on - i,m stumped. My brain has fried. Thought i would ask you guys.
cheers
SJF
I joined here a while back but haven't done much electronics since then. I've got the bug again and breadboarded up a small amp based on a AN7511 chip. I read about in a silicon chip mag - "The Champion" is what they called. Its a 1-3w amp depending on voltage. Its their update to the long running "Champ" kit which was based on lm386.
Anyways I just breadboarded the stock standard amp as per the panasonic technical data sheet http://www.semicon.panasonic.co.jp/ds4/AN7511_BEB_discon.pdf
I bought a couple chips at Jaycar.
The stock amp sounds fairly nice on the breadboard but clips a bit harshly when you dig into the strings a bit.
My plan was hook up a runoffgroove fetzer valve as a preamp and see how it would improve things.
The Fetzer is working nicely on its own bread board and the An7511 amp is working nicely on its own breadboard. But when i take the output from the fetzer and insert into the Amp - I get weird oscillations only - kind of like a synth. When I turn the volume pot on the fetter i get a frequency/pitch change of the noise.
Anyone have any idea of what is going on - i,m stumped. My brain has fried. Thought i would ask you guys.
cheers
SJF