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Old 13th June 2012, 01:23 PM   #11
wahab is offline wahab  Algeria
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There s a pot in the board to set the bias current.
If needed the bias range can be extended by sligtly
increasing/decreasing one of the resistors connected to its extremities.

As for the GB150 , i dont know its schematic so i cant give any opinion
about it.
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Old 5th January 2013, 07:46 PM   #12
Duco is offline Duco  Netherlands
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Dear audiodiy people,

Thanks a bunch for all your replies! I've been quite busy studying for my exams. But i'm going to continue with the diy project.

I would really like to contruct a pair of monoblocks or a stereo amplifier based on the pass f5 design. During my search I stumbled opon a small f5 pcb, I could not figure out what it's name is and where to buy it. So thats my first question.

Second, i would like to use my two 2 x 22v 300VA transformers, so I can shrink the stash of parts i collected in quite some time. Is this possible with the F5 design?

Yours,
Duco
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Old 6th January 2013, 02:29 AM   #13
Bigun is offline Bigun  Canada
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for pcb's try here: First Watt Clones - Power Amplifiers - PCBs

Your transformers are something I would consider suitable for a Class A amplifier. I have a trafo with 18V outputs and I'm using for a Class A amplifier (a JLH rather than an F5).

I'd suggest a single chasis, saves building two complete units. You can still use dual-mono construction of the amplifier - meaning each one has it's own trafo and separate wiring. They would share the same mains cable and power switch.
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Last edited by Bigun; 6th January 2013 at 02:32 AM.
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Old 6th January 2013, 05:45 PM   #14
Duco is offline Duco  Netherlands
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Allright! Thanks!

The JLH looks pretty nice. But I heart so much good things about the F5 amplifier, that I want to build one for myself. But the 2 x 22Vac secondaries are not suitable for a Pass amp?

Duco
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Old 6th January 2013, 06:31 PM   #15
weskoki is offline weskoki  Europe
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The F5 is great amp but needs careful matching.
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Old 6th January 2013, 07:18 PM   #16
Bigun is offline Bigun  Canada
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Quote:
Originally Posted by Duco View Post
Allright! Thanks!

The JLH looks pretty nice. But I heart so much good things about the F5 amplifier, that I want to build one for myself. But the 2 x 22Vac secondaries are not suitable for a Pass amp?

Duco
Let me think about this a bit more. Your transformers when rectified will give 22 x 1.4 = 30V d.c. per secondary. Probably the best option therefore is to use one trafo for each power rail, i.e. one for +ve and one for -ve which doesn't allow dual mono but I don't think that's something to lose sleep over.

The F5 schematics I saw call for +/-24V rails. So you could build a power supply with Capacitance Multiplier to smooth the rails and drop the 6V from your rectified 30V to around 24V per rail.

You will get the best advice by posting over on the PASS forum rather than this as many over there are familiar with the F5 amplifier you want to build.

I way yes - you can build it, just need to decide on the tradeoffs and do get yourself a big heatsink.

p.s. you can always build a JLH in the future and try it in the same chasis with the same power supply, say just one channel, and then you can compare the F5 with JLH. The journey has no end - be warned !
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Old 12th January 2013, 08:46 PM   #17
Duco is offline Duco  Netherlands
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Thanks for the advice. I will ask it on the Pass forum

I stumbled upon these last week and they stayed on my mind:
2 x Class A 10W Power Amplifier PCB Based on Aleph Mini | eBay

MOSFET Pure Class A Amplifier Kit Thick PCB | eBay

Hiraga Super 30W Class A Amplifier Kit | eBay

I heart a lot of good things about the Hiraga super, one is based on the F5 and the last one the Aleph mini. I'm still having troubles on deciding weather or not i could run them on a 22*Sqrt[2] = 31Vdc power supply. I'd love to start building soon but i don't want to waste my money on a project that will not succeed

will some of the above cirquits work on the 31Vdc with minor adjustments?
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