DIY Gyraf G7 mic in the U47 body

[wutty]

Hello everyone,it's my first time doing DIY.

 

[lightningbefore]

Hello and welcome! Please keep me posted on how your G7 in a U47 body goes. I'm going to work on mine too -- soon as I get married next week and have the time after.

 

[wutty]

This is the progress so far. Some components are not used because they bought the wrong size. They are still waiting for new parts. The next update will be completed together with the PSU. The welding is not good. Don't mind

 

[wutty]

The transformer is from china.Although it doesn't look like ll1548, the parameters are very close and only cost me 60 RMB(About 9 dollars).

 

[Khron]

Which parameters? And do you have a link where to get that transformer from?

 

[wutty]

https://m.tb.cn/h.UVi9yB8
I'm not sure whether this link can be opened outside China. If you need it, I can ask the seller about export.

 

[Khron]

I'm quite sure i'm not the only one who would be interested.

Not sure if it's the same seller, but i saw some pcb-mounted and canned 600:30k transformers in the "related listings" lower on that page, for 99rmb, which look quite interesting too. It'd be great if they had (or opened) a store on AliExpress too...

 

[Khron]

Actually, i think i found a store with very similar items:

https://www.aliexpress.com/store/gr...973155b3lPc1H&origin=n&SortType=price_asc&g=y

 

[wutty]

实际上，我想我找到一家商店有非常相似的商品：

[ URL展开=＂true＂] https：／／www．aliexpress．com／store／group／Transformer／1383441 _ 515253430．html？spm = a 2 g 0 o．store _ pc _ grouplist．8148362.8．7973155 b 3 LPC 1 h & origin = n & SortType = price _ ASC & g = y [／URL ]

Yes you are right，cuz there are many old hi-fi players in China so many factories still producing the transformers and tubes.Most factories are in Guangdong province and some others in Fujian.Some classic or basic transformers are nearly cloned by them so I can get some similar things in a cheap way sometimes.

 

[kingkorg]

Cool. What are the inductance values of the transformer?

 

[mrgrooves666]

Where did you source the pcb. I ordered one to analog classics, but it never arrived, and it seems it was their last, as they now show no stock...

 

[wutty]

Where did you source the pcb. I ordered one to analog classics, but it never arrived, and it seems it was their last, as they now show no stock...

I download the gerber file from Gyraf's web and find a shop to make it.

 

[wutty]

Cool. What are the inductance values of the transformer?

input:20h
output:450~650h

 

[wutty]

can somebody help me wiring this two transformers in psu？I tried this way but I don't know if it can be usable....

 

[Khron]

Why wouldn't it be usable?

 

[wutty]

Why wouldn't it be usable?

thank you！So just keep going on

 

[Khron]

That project has been public since many years ago (at least 2009, so ~13 years so far) - i should hope that, if it hadn't worked as in the schematic, there would've been corrections by now.

 

[wutty]

really ugly inside but it's nothing for self using hhhhh

 

[wutty]

The PSU is almost done, but I don't know what to put in this "10" place. I purchased the components required by psu according to the list provided by Mr. gyraf. Now there is a 25v2200uf capacitor left. Where is it connected?

 

[Khron]

Have you considered looking at the schematic?

And those are some awfully tiny "1000uF" / 35v capacitors you have there... Are they even 100uF?