Clone Goldmund Amplifier

[thienchay]

Oh , so i think you should be make a KIT speaker protec on output 🙂
when using it, I found peace of mind .
DIY mà 😀

 

[hien.t.nguyen]

Oh , so i think you should be make a KIT speaker protec on output 🙂
when using it, I found peace of mind .
DIY mà 😀

Of course,but it only protect speaker(zero DC,slow starts,fast off,...)not protect over current for mosfet.

 

[hien.t.nguyen]

Schematic protect speaker

 

[tommy1000]

What are this two parts function on the Metis 3? Part of protection? Can you show us?

 

[hien.t.nguyen]

What are this two parts function on the Metis 3? Part of protection? Can you show us?

Yes.

Part protect circuit of the metis3 including two IC: TL074CN and 74HC00D.

TL074CN have four units opam,using two 2 units opam for sampling from B+ comparison with voltage reference,not use 2 units.

74HC00D to control driver relay speaker.

When have problem on B+ is voltage reduced => Protect

Not protect zero DC.😕

 

[hien.t.nguyen]

Circuit here

 

[tommy1000]

Thanks, where are TP 25,29,27,31 connected?

 

[hien.t.nguyen]

Thanks, where are TP 25,29,27,31 connected?

Not connected anywhere.

Positive of the opam always is Low
Negative of the opam always is High
=> Output opam always is Low

This Low level will comparison with voltage is 70/11k/2= 3.18V

When have problem in B+ is this voltage will up or down => the change in output 74HC00D (pin11)

Regrads.

 

[tommy1000]

Thank you

 

[hien.t.nguyen]

Thank you

My opinion, to perform this simple function not need to use complex circuits diagram so.

I also do not understand why Goldmund use the TL074 (4 units opam) without using the TL072 (2 units opam)😕

There are places they use components is optimal.But there are many places they use components very difficult to understand.

When I clone them,I usually remove these parts.

Regrads,

 

[doancancel]

ngu nguoi

 

[iko]

English please, or translate.

 

[Phuong.hng]

And how do you like the sound? (I am live in Hai Phong)

 

[oiphy]

Yeah .
So i creat a list for register this PCB 😀

1 . thienchay
2 . oiphy
🙂

 

[Phuong.hng]

Not connected anywhere.

Positive of the opam always is Low
Negative of the opam always is High
=> Output opam always is Low

This Low level will comparison with voltage is 70/11k/2= 3.18V

When have problem in B+ is this voltage will up or down => the change in output 74HC00D (pin11)

Regrads.

What exactly are you trying to build? Can you tell me about that?

 

[gaborbela]

Toshiba transistors

Yeah, what he said.

Hello Jacco
I would be interested 4 pair Toshiba transistors. I'm sure yours 100% orig seeing the picture you posted.
Please let me know if you need some trade or $$ sell.
Thank you
Please PM me
Greetings Gabor

 

[rizqi]

any replacement for 2n5565??
that very hard in my country...
thanks and regards

 

[fredlock]

Complete the layout

Hi Hien,

Have you offered a Group buy on your PCB board? Was that final and functional? It looked really nice?

 

[KatieandDad]

Looks suspiciously like this clone on E-Bay

HiEND power amplifier~195W*2 8ohm RMS, Gold*Mund mimesis 29 (230V black panel) | eBay

And he's selling the boards on their own as well.

http://www.ebay.co.uk/itm/2pcs-HiEn..._HomeAudioHiFi_Amplifiers&hash=item337f15f07a

 

[Cuda]

Looks suspiciously like this clone on E-Bay

HiEND power amplifier~195W*2 8ohm RMS, Gold*Mund mimesis 29 (230V black panel) | eBay

And he's selling the boards on their own as well.

2pcs HiEnd power amplifier board, base on GOLD*Mund 29 195W*2 assembled & tested | eBay

Do you think it is a real clone and real transistor ?