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Old 26th February 2010, 11:31 PM   #1301
lanchile is offline lanchile  United States
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Quote:
Originally Posted by apexaudio View Post
My mini PA Amp
Very nice!. I would just turn upside down those boards, since with time all dust will get inside amp and can get on the boards connections and accumulate and get a short.you have more chances to get more problems this way than putting it upside down. just my opinion!
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Old 27th February 2010, 12:19 AM   #1302
apexaudio is offline apexaudio  Serbia
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There is cooler fan and tunel heatsink any dust cant go insaid amp. I turn upside down those boards in future amps.
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Old 27th February 2010, 01:43 AM   #1303
lanchile is offline lanchile  United States
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There is cooler fan and tunel heatsink any dust cant go insaid amp. I turn upside down those boards in future amps.
Try to get a bigger heat sink, that way you can eliminate the fan (noise).

Last edited by lanchile; 27th February 2010 at 01:45 AM.
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Old 27th February 2010, 02:03 AM   #1304
apexaudio is offline apexaudio  Serbia
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In PA use noise is not a problem, fan turn on after heatsink was worm, than music level is so loud than can not hear the fan noise.
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Old 27th February 2010, 03:45 AM   #1305
lanchile is offline lanchile  United States
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In PA use noise is not a problem, fan turn on after heatsink was worm, than music level is so loud than can not hear the fan noise.
Well, in that case, I guess it is ok!
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Old 3rd March 2010, 02:27 PM   #1306
andrewlebon is offline andrewlebon  India
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hi diyers
greetings picture of dr boras stagemaster mk 2
will be posting pictures of btl2000 watts very soon with circuit and pcb
thanking you
Andrew lebon
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Old 5th March 2010, 08:06 AM   #1307
black is offline black  Romania
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studiomaster mk2 sound good? Why ditch and final transistors use if possible and with the printed wiring
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Old 5th March 2010, 10:04 AM   #1308
black is offline black  Romania
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stagemaster mk2 sound good? Why ditch and final transistors use if possible and with the printed wiring
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Old 11th March 2010, 07:41 PM   #1309
roger_lew is offline roger_lew  United States
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Default My Mark Houston ZCA sans output caps

Here's some pics of my ZCA I built about 7 months ago. The rugged industrial look probably isn't for everyone. I kinda like that you can look at it and see how it works. Each channel has eight 30 ohm 10 watt resistors arranged to provide the 15 ohm load specified by Mark. I used 8/channel basically to increase the surface area and help with cooling. I don't really know if it helped or not, they run at about 145F (66C). Heatinks were purchased as a set from ebay.

Fuse is integrated into the receptacle. In the out-of-focus picture the chassis ground is the green wire (sorry, I forgot to turn macro on for that one ).

Transformer is an 18 + 18 250VA Avel. Each secondary has its own bridge and filtering and powers a single channel. Eventually I'll get new filter caps and play with better (?) rectifier options. I'm use Erse Super Q 10mH 500w inductors as chokes.

I use it to bi-amp mid/tweeters in my 3 ways which both have series caps so I can get away without the electrolytic output caps (they are functional in the photo).

The last photo shows an important reminder to my future self.

The sound is quite pleasant. Percussion, vocals, and instrumentals sound extremely dynamic and lively. I have noticed it doesn't sound as good as my regulated gainclone when sources have limited dynamic range (television commercials). The ZCA sounds more distorted at comparative volume levels. With well mixed sources distortion seems subjectively low or maybe just more enjoyable to my ears.
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Old 12th March 2010, 12:53 AM   #1310
vixr is offline vixr  United States
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These are the SSB01 PCBs Per-Anders is giving away...turned out pretty good. I still have one more to build before I can put them in an amp...

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