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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Wed Apr 20, 2011 4:49 am 
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Posts: 238
wavebourn wrote:
Etching first PCB for the project.



Image



I see that you drill the PCB before etching. I find that if I do that, the inner diameter for the hole will also get etched away leaving some bare board. How do you prevent that from happening with your PCBs?


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Wed Apr 20, 2011 8:42 am 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7317
Location: Pleasant Hill, California
quikie22 wrote:
I see that you drill the PCB before etching. I find that if I do that, the inner diameter for the hole will also get etched away leaving some bare board. How do you prevent that from happening with your PCBs?


How I do it:

1.) Draw topology on paper,

2.) Cut copper clad board to size,

3.) Wrap the board into paper,

4.) Using sharp punch knock through the paper points where to drill,

5.) Unwrap the board, sand it carefully in order to remove all dirt and oil,

6.) Drill,

7.) Draw,

8.) Let it dry,

9.) Etch,

10.) Wash carefully in running water, with soap,

11.) Clean by acetone,

12.) Sand a bit.

It is ready to solder now.

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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Thu Apr 21, 2011 10:10 am 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7317
Location: Pleasant Hill, California
Heatsink base mounted, it will have thermal contact with chassis.


Image

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А женщина даже в мужской рубашке выглядит гораздо приличнее, чем мужчина в женских колготках! Be-be-be!


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Fri Apr 22, 2011 4:21 pm 
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Joined: Mon Mar 22, 2010 1:10 am
Posts: 238
wavebourn wrote:
quikie22 wrote:
I see that you drill the PCB before etching. I find that if I do that, the inner diameter for the hole will also get etched away leaving some bare board. How do you prevent that from happening with your PCBs?


How I do it:

1.) Draw topology on paper,

2.) Cut copper clad board to size,

3.) Wrap the board into paper,

4.) Using sharp punch knock through the paper points where to drill,

5.) Unwrap the board, sand it carefully in order to remove all dirt and oil,

6.) Drill,

7.) Draw,

8.) Let it dry,

9.) Etch,

10.) Wash carefully in running water, with soap,

11.) Clean by acetone,

12.) Sand a bit.

It is ready to solder now.


How about the boards for your SMT circuits? I have trouble drawing traces that are fine enough for these super small devices. I am asking this because trying to design the board for the BSP225 gyrators.


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Fri Apr 22, 2011 9:33 pm 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7317
Location: Pleasant Hill, California
It is simple: don't use the drain leg that is in the middle between source and gate, use one on top instead, and make the drain isle of bigger area, for better heat dissipation.

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А женщина даже в мужской рубашке выглядит гораздо приличнее, чем мужчина в женских колготках! Be-be-be!


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Mon Apr 25, 2011 5:15 am 
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Joined: Fri Mar 19, 2010 8:59 am
Posts: 21
great Smile

don't know if you already knew about DIY Layout Creator, (Free) it's great to layout point to point designs, also for chassis, etc.


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Mon Apr 25, 2011 9:56 am 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7317
Location: Pleasant Hill, California
Thank you;
I will check when get home. I am in an airport now...

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А женщина даже в мужской рубашке выглядит гораздо приличнее, чем мужчина в женских колготках! Be-be-be!


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Mon Apr 25, 2011 12:27 pm 
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Бывший администратор

Joined: Sun Mar 28, 2004 12:19 pm
Posts: 4366
Location: оттуда
В свое время еще в Союзе покупал я заранее напечатанные шаблончики посадочных мест для всякой мелочи... Просто прикладываешь к плате и прокатываешь. Они к плате прилипают, как краска. Потом счищаются шкуркой или ножом... Думаю, что и тут подобных шаблончиков навалом... Pre printed.

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Как - то так...


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Mon Apr 25, 2011 4:12 pm 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7317
Location: Pleasant Hill, California
pomorin wrote:
В свое время еще в Союзе покупал я заранее напечатанные шаблончики посадочных мест для всякой мелочи... Просто прикладываешь к плате и прокатываешь. Они к плате прилипают, как краска. Потом счищаются шкуркой или ножом... Думаю, что и тут подобных шаблончиков навалом... Pre printed.


Для прототипа проще нарисовать от руки. А для красоты, для продукции -- всяко лучше заказать партию печаток. Шлёшь им файл, платишь кредиткой, получаешь печатки по почте.

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А женщина даже в мужской рубашке выглядит гораздо приличнее, чем мужчина в женских колготках! Be-be-be!


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Tue Apr 26, 2011 1:25 am 
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Joined: Mon Mar 22, 2010 1:10 am
Posts: 238
I use both etched PCBs and also veroboard (stripboard). Bought a stack of these stripboards for prototype work but ended up as permanent circuits Smile

Once I got the hang of it, I found that veroboard can be a very convenient and powerful design tool. Only problem would be the increase in size of the circuit board due to the fixed spacing of the components.

I remember what pomorin mentions. Those stickers were very popular here too during the 1980's and 1990's and very convenient and produced very neat and professional PCBs. Sadly, DIY here is dying out with the arrival of mass produced electronic items. These stickers cannot be found any longer in our shops here, so have resorted to hand drawing our circuits too. I bought a large number of phenolic PCB blanks (the leftovers in a shop) as they are also being phased out and no longer being sold. Even FeCl3 is hard to find.

PCB for double sided SMT is something new to me. Small devices and "through" hole connections... don't have the knowledge and abilities for this. Here we don't really have manufacturers who will make PCB. Have to send to China or Hong Kong.


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Wed Apr 27, 2011 3:02 pm 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7317
Location: Pleasant Hill, California
quikie22 wrote:
PCB for double sided SMT is something new to me. Small devices and "through" hole connections... don't have the knowledge and abilities for this.


When SMD devices were not available I sometimes used case-less devices for hybrid ICs. They were tiny dies like 2x2 milimeters with hair thin golden wires. Whish I have such seeng now... I once modified a pocket radio, it was flat AM only radio, something like a chokolate thickness. It had an audio output stages made like typical opamp, but with resistors where current sources were supposed to be in a real opamp. I soldered there caseless JFETs. Funny thing, one guy broke it later trying toi fix... He did not recognize devices under drops of a glue, instead of resstors.

When I made 2-layer PCBs I drew their topology using pens with different colors. Usually top layer needs few traces only. I used leads of existing devices to interconnect between layers: I soldered them on both sides.

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А женщина даже в мужской рубашке выглядит гораздо приличнее, чем мужчина в женских колготках! Be-be-be!


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Wed May 04, 2011 1:29 am 
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Joined: Fri Mar 19, 2010 8:59 am
Posts: 21
wavebourn wrote:
Here is one more pair of interesting output tubes:

Image

Image



had a look around, and they're expensive...

how is the Gubernator going??


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Wed May 04, 2011 8:58 am 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7317
Location: Pleasant Hill, California
Soldering wires.

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А женщина даже в мужской рубашке выглядит гораздо приличнее, чем мужчина в женских колготках! Be-be-be!


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Fri May 06, 2011 7:56 am 
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Joined: Mon Mar 22, 2010 1:10 am
Posts: 238
wavebourn wrote:
Soldering wires.


finished?


 
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 Post subject: Re: Gubernator - 8: parallel SE GU-50 amp
PostPosted: Fri May 06, 2011 8:31 am 
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Шаман, типа...

Joined: Tue Feb 10, 2004 12:30 pm
Posts: 7317
Location: Pleasant Hill, California
quikie22 wrote:
wavebourn wrote:
Soldering wires.


finished?


No. I'll post pictures.

_________________
А женщина даже в мужской рубашке выглядит гораздо приличнее, чем мужчина в женских колготках! Be-be-be!


 
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