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Old 24th August 2006, 06:44 AM   #1
denver is offline denver  Philippines
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Wink hello, how about this booster for amplifier

hello everyone, what can you tell about this booster? for me i love it. i dont know why bec. its realy good for low power amplifier... any comment should be appreciated.. tnxx....
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Old 24th August 2006, 09:01 AM   #2
unmibh is offline unmibh  Bosnia and Herzegovina
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Hi Denver,

I remember them , it was a hit in the 80's , I built one as well during those days and I was surprised how good it is considering using so few parts. I would like to build one again using newer transistor in place of the 2955 but I don't know if the transformer are still available.

cheers
rom
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Old 24th August 2006, 09:44 AM   #3
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I wonder why PNP transistors were used in the original when equivalent size NPN's are stronger and cheaper? It does use a single supply rail so that keeps things simple. In fact, it's not really that much different (conceptually at least) from the one that was here a year or so ago by someone named Susan, IIRC. Here it is.
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Old 24th August 2006, 10:59 AM   #4
unmibh is offline unmibh  Bosnia and Herzegovina
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Hi Cylo,

IIRC, there are diffrent variation of similar circuit floating around from diffrent shops offering booster amp then where this came from. There are also NPN 2N3055's but I don't have any diagram of them now. May be Denver, have more to offer.


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rom
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Old 27th August 2006, 09:11 AM   #5
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hello everyone,

I remember this booster amplifier and it still on the market today ( here in the Philippines). I used to intall this booster with the ever popular Pioneer KP 500 car stereos with a couple Pioneer PT-6 tweeters on our king of the road, the jeepney's. There are 3 version of this booster, the 50W (the one that you posted) the 100W (with 4 outputput transistors and a bigger output transformer) the 150W ( with 6 output tranies running on a 24V dc supply) and I am wondering if they are really putting out that power. MJ2955 was used so you could mount it directly on the heatsink. I remember we used to assemble these on a C bar aluminum, then a handful of LED's, resistors, 1N4148's for a simple VU meter to go.

regards,
audiomachine
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Old 27th August 2006, 09:48 PM   #6
anatech is offline anatech  Canada
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Oh my!
The mind basters are back!!

These were sold as assembly with a 6" X 9" (cheap) speaker in the early 70's. Man, they sounded really bad. They were very similar to your diagram, but I think NPN 3055's.

I can't believe the concept is still around.

-Chris
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Old 28th August 2006, 12:17 AM   #7
clem_o is offline clem_o  Philippines
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Hey Chris,

These beasts are still popular here - usually see them in pedal-powered transports (bicycle with a sidecar). The driver maintains a 12V lead-acid battery, usually tucked right under the passenger seat in the sidecar. You have them blasting away, and for the life of me I can't figure why anyone would want to ride them, with the tweeters screeching into your ears and the bass booming all over...


And yeah, audiomachines is right - the other application area would be the public transport jeeps and buses, though loud music is banned on 'real' public vehicles...


Cheers!

Clem
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Old 28th August 2006, 12:33 AM   #8
anatech is offline anatech  Canada
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Hiya Clem!,
And I though they were bad way back then. I doubt they sound any better today!

-Chris
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Old 28th August 2006, 12:40 AM   #9
clem_o is offline clem_o  Philippines
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Chris,

The quality of the metal going into the transformers was better back then. So you have a pretty good idea of what these things sound like... No offense to denver meant - perhaps his unit is one of the better-sourced ones...

Cheers!

Clem
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Old 28th August 2006, 04:10 AM   #10
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hello,

but in the first place this is where i got into audio constructing these booster amps he he he he quick, cheap and dirty no offense to denver. maybe you could construct a gainclone with a simple voltage divider on the input so you could feed it with speaker level signals. yeah i miss those days well all that matters to you is bass and your treble and don't forget to turn on that loudness contour i remember we use to souped up those Pioneer KP 500 modifying their tone controls, this booster amp is the reason why AN214 ic's sells and got extinct. yaikess am I that old ha ha ha ha

regards,
audiomachines
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