Burning Amplifier BA-2

[Nelson Pass]

Two is routinely a little more quiet with regards to mechanical
noise, but has a little more loss in the rectifiers.

 

[Melon Head]

Must be time for another BA front end board.

What about an F3 front end connected to follower output stage?

 

[generg]

Hi cviller,

please, what is the use of the (extra D3) an D4 on your BA-2 Board? They are not mentioned in the circuit.

Is there a BA-x guide similar to F5 and F4?

 

[Zen Mod]

itching .... itching ......

 

[generg]

itching .... itching ......

Hi ZenMod,

I had to google "itching" means "kratzen, jucken" in German, but I don´t understand what you want to say to me?

I already have a bald point on my headby itching the same place, but it does not help, should I continue?

 

[Zen Mod]

itching fingers , itching head - whatever

meaning is same - too much thinking about building things ...... too little time in listening da muzak .....

are you listening while you're building/thinkin' ?

if yes - then just say to me

 

[generg]

oh ZenMod,

I have holidays......

I hear music very often the last days, Mile Davis, John McLaughlin, Yello and many other good things.

I did not change BA-1, the sound is very pleasing.

.....but I want to know what changes when I go back to push-pull!

and the board dimensions of BA-1 and BA-2 are very similar, so change is easy.

All is done without stress I want to keep holiday feeling.....

I hope you are well toooooooooooooo!

 

[cviller]

The reason for the extra diodes is kinda crazy... we decided that it would be nice to make it possible to cut the boards to 2 or 4 pairs and if you want to preserve symmetry need those extra diodes. Don't worry about them.

 

[tinitus]

Ehh, would the full blown 6 pair BA-2 be ok to drive 1ohm ribbon tweeters ?
I suppose a tweeter will be an easier load ?

 

[MHLY01]

Think I anyone can build these to use for car audio?. Thinking single chassis with 8 channels. No idea. Thanks.

 

[tinitus]

Think I anyone can build these to use for car audio?. Thinking single chassis with 8 channels. No idea. Thanks.

I dont think classA would be ideal for carfi

Not sure what would happen if each device of BA-2 would drive each their own speaker, or in pairs

 

[MHLY01]

Maybe the 1 instead? thinking the 2 as most car speakers are 4 ohm. Could bridge each amp to drive one speaker or run as stereo. I want to build a competition system with just 5 or 6 speakers, have OW1FS tweets and Rev 5 for the front and probably stuff a 12 under the dash somewhere. Be interesting experiment except I know I can't put the amps together.

 

[cviller]

Is it for a SPL competition? If so, then you are at the wrong place... this amp draws a lot of current relative to how much sound pressure you can produce with it - and this holds true for basically all the amps here at pass-labs forum. If you want something efficient, you should check out some low biased AB or class D amps.

 

[MHLY01]

No, hate SPL. This is for SQ competition. Just wanted something different and the best sounding amps possible. Everything new on the market is super small footprint class D which all sound like ***. I have had a lot of high end amps in my car, just looking for something unique.

 

[flg]

I think maybe 4 batteries and F5s might get you something worth doing...

 

[tinitus]

Its classA rating is into 8ohm load
If you have 4ohm car speakers you will get half output in classA
And a balanced/bridged design will see yet half of that load

Another problem is the symmetric +/- supply
I a car you have 0/12V

Anyway, I would be think twice before putting DIY amps into a car, unless you know how to handle it

 

[cviller]

If you run +/- 12V rails, then you should probably look into bridged amps to get enough swing. You could also use F5's as flg suggests - they are very easy to build, but to get them running nicely, you need a bit more voltage than the 12V...

 

[flg]

2 batteries on one rail and 2 on the other... + & - 26Volts
Your on your own figuring out how to charge them though

 

[dheming]

2 batteries on one rail and 2 on the other... + & - 26Volts
Your on your own figuring out how to charge them though

Charging them wouldn't be too hard. One could just use some HD relays to reconfigure the connections for two different modes: batteries in series for powering F5, batteries in parallel for charging. Of course you wouldn't be able to charge while listening to music with this kind of setup but it would be simple and cheap to do.

 

[generg]

Must be time for another BA front end board.

Hi Mr. Pass ;

... may be you can give us some details what you intend?

my BA-1 is working very fine! I hear it alternating with a P1.7 clone and pumpkin, enjoying the different sound of both.