Amp Camp Amp - ACA

[jan.didden]

Why not? Need to find a facility with a dozen solder stations or so.

 

[buzzforb]

So pretty much a total newb here. But I did get to go to this camp, and had an amazing time. I learned a ton about introductory electronics etc, how this amp works and why, and some basic sound theory, most of this you guys all know like the back of your hand. But as my first real musical electronics project this was an amazing time, with amazing people, and coming out of it with 2 amazing amps is just straight exhilarating.

So now, Im trying to figure out how to pair speakers to this (again total beginner). Jason was saying something about this ends up being a 5 watt class a power amp, which requires high sensitivity speakers (95db+). But I'm not exactly sure what this means or how to find a good match. Any advice, or questions about the camp and my experience there?

I think this would be a good intro. THere is a thread with the Tilte EMKEN. Check it out.

 

[Antoinel]

Any advice, or questions about the camp and my experience there?

Tell us more about your experience. Who taught the electronics part? I find it amazing that you built 2 amps in one day! A fast learner you are.

 

[Antoinel]

This sounds like a fantastic project to do, wish I could have been there!
Maybe I should do one in Europe...

jan didden

Great idea. May begin with an introductory Pre-Amp Camp, then following it with Amp camp [your choice of amp; maybe a chip] and ending it with Loudspeaker camp. The newbie DIYer will have a [complete] stereo system to enjoy.

 

[juma]

interesting, is this CCS will work with the 2SK82 also ?

why not?

It won't work because 2SK82 is a depletion mode device. Read the article you two lazy bones, it's in the last sentence of the "Parts" section...

 

[buzzforb]

Why this amp not work with the CCS on top of depletion mode device? I believe that is all he was asking about.

 

[Zen Mod]

that amp will work , whatever you put in there .

in a right way .

but it will not be the same amp

 

[juma]

Why this amp not work with the CCS on top of depletion mode device? ...

It won't because the depletion mode device asks for another type of biasing - you'd need negative Vgs for Q1 (in the article it's positive)...

 

[buzzforb]

The discussion is beyond the scope of the article. I apologize.

 

[Ipanema]

Just completed this amp with p2p connection. Sounds nice for such a small classA amp. I'm using BC550B which only gives 0.58V instead of 0.65V. How can I compensate for the biasing difference? Thanks.

 

[juma]

... I'm using BC550B which only gives 0.58V instead of 0.65V. How can I compensate for the biasing difference? Thanks.

Nothing really to compensate for - the only consequence is about 10% lower bias. If you want higher bias try another small BJT or adjust values of R1-R4 (lower value resistors will give higher bias).

 

[Ipanema]

What are the functions of R1~R4 besides setting the bias current? Thanks.

 

[juma]

What are the functions of R1~R4 besides setting the bias current? Thanks.

See SRPP+ here:
SRPP+ All-in-One & Mu Followers
or Google for "mu follower"

 

[generg]

juma can you fake a SIT out of it....?😀

question is half joke, half cool idea.....😎

 

[Zen Mod]

it's already faked , I think by revintage

 

[generg]

it's already faked , I think by revintage

Yes Zen Mod, will it drive F4? 😀😀
and this button 😎 is a fake too! that lasts on.... I want the red one back..... vintage..... Not these alcoholic blue one.....

 

[buzzforb]

Of course not, Sit is depletion device. Its right there in the article....lazy!😉

 

[generg]

Juma is gifted......!😎

 

[Zen Mod]

but fake SIT made of enhanced mode device is still enhanced mode device



not that I'm forgetting amp. factor issue then , if we are still talking about Camp Amp

 

[buzzforb]

I agree on all counts.