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PostPosted: 03 Dec 2012, 13:29 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
The third board is an optional speaker protection circuit. You can find convenient speaker protection circuit kits on eBay.

Cheers

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PostPosted: 03 Dec 2012, 19:18 
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Joined: 03 Dec 2012, 18:52
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Hi! I want to build this amp. Would drive nicely a pair of Boston Acoustics VR1? They are 8ohm 93 dB sensitivity. Will this push enough power?
Image



Also i wanted to experiment with a Marshall MG412CF cabinet that has not aplification. Consist on 4 x 12" Celestion speaker , with sensitivity something around 96dB.
Image

Thanks!


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PostPosted: 04 Dec 2012, 16:50 
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Joined: 02 Dec 2012, 02:38
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Thank you so much Gio,
One more thing, The transformer is 25-0-25V, how can we get 35-0-35v? Forgive me if my question looks silly :D
Thanks in advance


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PostPosted: 04 Dec 2012, 21:25 
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quochuy0202 wrote:
The transformer is 25-0-25V, how can we get 35-0-35v?

After you rectify and filter the 25VAC from the transformer secondary you end up with about 35VDC (use a 1.4 multiplier for quick estimates)

tecnogadget wrote:
Hi! I want to build this amp. Would drive nicely a pair of Boston Acoustics VR1? They are 8ohm 93 dB sensitivity. Will this push enough power?

Also i wanted to experiment with a Marshall MG412CF cabinet that has not aplification. Consist on 4 x 12" Celestion speaker , with sensitivity something around 96dB.

The amp should mate well with those speakers. 20W with 93dB speakers can be very loud. At 1m you can generate over 105dB. How loud did you need?

Cheers

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PostPosted: 06 Dec 2012, 13:18 
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Joined: 03 Dec 2012, 18:52
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Yes , that looks like enough power to me. But for example , at 20W you are pushing the amp to the max power , is that the reason people likes to have an amp with more watts to be able to put the volume knob at not more than 70% ? i think to avoid distortions at max power. Thanks Gio !
Cheers , Stefano


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PostPosted: 13 Dec 2012, 21:27 
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Hi Stefano, at half the power the output would only be 3 dB less.

So at 10W, output is 102dB @ 1m. ;) Plenty loud!

Cheers

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PostPosted: 16 Dec 2012, 19:55 
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Joined: 03 Dec 2012, 18:52
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You win jaja ! I'm out of excuses to not build this amp. I'll try as soon i have more spare time. I'm looking forwards to try it.


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PostPosted: 18 Dec 2012, 04:02 
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Joined: 20 Jan 2010, 04:18
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Hi, everybody.
I want to do this project so I'm seach for "jean's hiraga 20w class A" on Google.
I found this pcb (see the picture) Do you think it work for this project?

Image

circuit for this pcb

Image

With best regards
Katip


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PostPosted: 17 Jan 2013, 17:26 
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Joined: 17 Jan 2013, 17:07
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Hello, you forgive for the Englishman who belongs to translator.
It will try to be brief
For the network I found this project and I like much. My questions are: is Tranformador toroidal of 22v-0-22v 200VA for a channel sufficient? I have two one for every channel. Before igniting for the first time there is some consideration to bearing in mind, as the position of 500R? I hope that I am understood.
Regards and my congratulations for this project


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PostPosted: 19 Mar 2013, 17:19 
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Joined: 13 Feb 2013, 17:03
Posts: 1
Hello!
I am new to the forum, I have seen this project and I want to build it but I have some doubts.
First: anyone have some kind of document that explains how to adjust the amp once built??
Second: Could someone tell me all transistors equivalents project? Most of them displayed as out on pages selling online components.
Thanks and apologies for the text, translated by Google.


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