"Magga Amp Workshop" builds again (Simple 45 Project) - diyAudio
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Old 3rd February 2009, 03:43 PM   #1
Niila is offline Niila  Finland
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Join Date: Aug 2004
Location: Oulu
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Default "Magga Amp Workshop" builds again (Simple 45 Project)

Greetings dear friends!

Couple of months ago i decided to build an amp to drive my headphones, but as weeks went by and i really didnt find what i was looking for, i changed my mind and decided to build simple SE amp for my speakers. My current 2W amp is just a tad too weak so with these 2A3's im supposed to get around 5W.

Simple 45 using 2A3's (2001 edition)

This is very porpular design, mainly beacause its simplicity and reputation as a sweet sounding amp. All parts were quite easy to acquire even here in Finland. I could have used little bit cheaper parts, but i really want to make this as good as i possibly can. My budget is 700 euros, much more than really is needed to build this amp.

Click the image to open in full size.
Hammond enclosure and irons. Feel free to suggest a nice color scheme! I was thinking about deep orange with shiny laquer.... we will see.

Click the image to open in full size.
Some good quality caps

Click the image to open in full size.
Lovely NOS Bulgin switch that im going to use. I bought handful of these.


As you saw, i have already bought most of the parts. Im going to get Welter OPT's from germany in 2-3 weeks, so i have plenty of time to accomplish rest of this amp first.

Here are the PCB's i designed last week.

Click the image to open in full size.
This is the timer board with Omron G2R relays to cut mains and high voltages. Nothing speacial here. 12V regulated power supply and a simple 555 timer to delay B+ for about 10 seconds.
Those big caps next to relays are orange drops..i didnt know they would be that big but luckily i have free space to spend

Click the image to open in full size.
This is the input selector board. 4 Omron G5V relays and pretty much nothing else

The amp itself is going to builded point to point. Heres a little drawing of it.

Click the image to open in full size.

The drawing is far from perfect, and the scales are screwed up, but you might get the idea.

To be continued...

-Niila Magga
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Old 3rd February 2009, 08:51 PM   #2
Niila is offline Niila  Finland
diyAudio Member
 
Join Date: Aug 2004
Location: Oulu
Send a message via MSN to Niila
This is my luck! Of cource google doesnt like copying images like that, so ill try with photobucket this time. Sorry to double post some pictures but i think the rest will disappear too in some time... I hate this kind of tweaking! If any admin sees this i hope the first post could be deleted..

Greetings dear friends!

Couple of months ago i decided to build an amp to drive my headphones, but as weeks went by and i really didnt find what i was looking for, i changed my mind and decided to build simple SE amp for my speakers. My current 2W amp is just a tad too weak so with these 2A3's im supposed to get around 5W.

Simple 45 using 2A3's (2001 edition)

This is very porpular design, mainly beacause its simplicity and reputation as a sweet sounding amp. All parts were quite easy to acquire even here in Finland. I could have used little bit cheaper parts, but i really want to make this as good as i possibly can. My budget is 700 euros, much more than really is needed to build this amp.

Click the image to open in full size.

Click the image to open in full size.
Hammond chassis and irons. Feel free to suggest a nice color scheme! I was thinking about deep orange with shiny laquer.... we will see.

Click the image to open in full size.
Some good quality caps

Click the image to open in full size.
Lovely NOS Bulgin switch that im going to use. I bought handful of these.

As you saw, i have already bought most of the parts. Im going to get Welter OPT's from germany in 2-3 weeks, so i have plenty of time to accomplish rest of this amp first.

Here are the PCB's i designed last week.


Click the image to open in full size.
This is the timer board with Omron G2R relays to cut mains and high voltages. Nothing speacial here. 12V regulated power supply and a simple 555 timer to delay B+ for about 10 seconds.
Those big caps next to relays are orange drops..i didnt know they would be that big but luckily i have free space to spend

Click the image to open in full size.
This is the input selector board. 4 Omron G5V relays and pretty much nothing else


To be continued...

-Niila Magga
  Reply With Quote

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