An illustrated guide to building an F5 - Page 57 - diyAudio
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Old 15th November 2012, 12:43 PM   #561
ssmith is offline ssmith  France
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Quote:
Originally Posted by AudioSan View Post
another solution is a F5 mini. running on +/-15V and 0.8A bias. with a J-fet boz preamp.
that will give you alot of good sound for a smal amount of power.
Sorry to jump in on this thread.

Terrific reading by the way with great build photos -- thanks! -- and it's really given me the urge to try an F5 build as my next project. I built some Mini A's a few years ago (they're in storage right now) but havent been here in ages and havent done any DIYing either.

The F5 looks like a great build and I spotted AudioSan's post on using a transformer with 15v secondaries -- which I can take from my Mini A's. I would love this as it would save quite a bit of money. But I'm really a beginner, so have to ask if there would be big changes in the circuit using a 15v toroid instead of an 18v ???? Also, what would the approximate output power be? My Mini A's were around 10w into 8ohms IIRC and I never felt I lacked power!

Thanks for any advice!
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Old 15th November 2012, 12:55 PM   #562
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hello. no changes needed in the circuit. output will be around 17-18W at 8ohm and 1-1.1A bias to make it stay in classA.
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Old 15th November 2012, 02:21 PM   #563
ssmith is offline ssmith  France
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Quote:
Originally Posted by AudioSan View Post
hello. no changes needed in the circuit. output will be around 17-18W at 8ohm and 1-1.1A bias to make it stay in classA.
Thanks AudioSan, that's great to know.
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Old 25th November 2012, 04:04 PM   #564
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Hi all,

Me again with still more problems
It took a while but I finally received new fjets (Q1 & 2) and installed them.(thank you Spencer)
At first turning P1 & 2 Igot no response. I turned off the amp and then turned on again and R12 started smoking...
Please help- what's next? Changing Q4?
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Old 12th December 2012, 05:45 PM   #565
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Quote:
Originally Posted by IZHAKKATZ View Post
Hi all,

Me again with still more problems
It took a while but I finally received new fjets (Q1 & 2) and installed them.(thank you Spencer)
At first turning P1 & 2 Igot no response. I turned off the amp and then turned on again and R12 started smoking...
Please help- what's next? Changing Q4?

Review the back of the pcb, burned the R12 is likely to have burnt some clue circuit...
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Old 13th December 2012, 09:36 AM   #566
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Sorry for rushing in:

I replaced ZTX450 with BC550. ZTX is CBE, while BC is EBC. Is this correct??? Just turn the transistor???

Regs, Dirk
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Old 13th December 2012, 11:41 AM   #567
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Sorry for the stupid question. Found the answer. Will fix it. ;-)
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Old 13th December 2012, 12:39 PM   #568
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Smile Six F5 together with power supply SMPS

Presenting the assembly of six units F5 in one case. The result is very good for use in mids and highs - multi amplification system.

Invite friends and users look: https://www.facebook.com/media/set/?...4163418&type=1
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Old 13th December 2012, 12:52 PM   #569
AndrewT is offline AndrewT  Scotland
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I am surprised how small the smoothing is.
I think I can read 22mF. Is that 22mF*3 per rail? For all six F5!
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regards Andrew T.
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Old 13th December 2012, 01:01 PM   #570
dazed2 is offline dazed2  Canada
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where do you get those heatsinks! Very Nice!
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