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Chip Amps Amplifiers based on integrated circuits

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Old 27th March 2003, 07:37 AM   #1
Rarkov is offline Rarkov  England
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Default PICS: GainClone Monoblock pics

Hi,
I've built this system for my brother. He wanted to be able to plug his portable mini-disc player into it, so one of the inputs on the preamp is a screened 3.5mm stereo jack. Apart from the cases, everything is made by my fair hands! I've nearly finished it - I'll post internal pics soon. My brother wanted this as a "classy bedroom amp"...

Goto http://www.rarkovelectronics.co.uk
Click to enter, then on the GainClone link under the Projects heading.

Hope you like them...
Gaz
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Old 27th March 2003, 11:06 AM   #2
monguz is offline monguz  Hungary
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Looks great! Are these custom made cases? Would like to see further details of the construction, inside closeups, etc.

I'm about to finish my "cloning" one of these evenings This will be a test setup to check the sound of the beast and also if I could have both the chips and the psu in one box. I've installed the transformer pretty close to the IC's so wonder if it will make some noise or hum.

The transformer is a rather small one and not the final, just got it for a few weeks. Also, I use only el cheapo parts for the first time. Anyhow, it will hopefully make me able to decide if this simple circuit is really so fantastic, and if so, then I can put more effort into construting a solid case and all the mechanical details.

Good luck with your Gainclone and keep us informed about your progress!

Regards


monguz
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Old 27th March 2003, 01:48 PM   #3
Rarkov is offline Rarkov  England
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Hi,
Thanks for your comments. The cases are from Maplins. The manufacturer's part number is AB13. The cases are 6"x4"x2" (wdh). I am only using a 120VA xformer with 25V seconadries. I'm hoping this is going to make the voltage rails droop a couple of volts so that the 35V caps wil be in a safe operating range

I will update the pics with better / internal ones soon. You'll find the PSU extremly cramped and the rest of the boxes are empty! I could have put the Two amps and Preamp together but I wanted a classy 4 box system!

I will give you an idea of sound quality when I finish the PSU cables (The connectors are on back order!)

Gaz
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Old 27th March 2003, 02:31 PM   #4
Kram is offline Kram  United Kingdom
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hello gaz,

My gainclone is still a rats nest in a cardboard box, I might buy some of those cases on friday afternoon and destroy the rats nest over the week end. Hopefully by this time next week i will have a neat and tidy gain clone.

My set up will be slightly different from yours, I bought two 220VA 2x25V Transformers from RS, i dont think they will fit in the cases you have used, I aslo want to put both channels in one box.

What is the preamp you are using? Is it a passive one?

I just finished Rod Elliotts preamp (project 88) last night, I need to get a box for that too, and some more RCA sockets.

See you later.
Mark
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Old 27th March 2003, 02:43 PM   #5
Rarkov is offline Rarkov  England
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Hiya Mark,


I swear by those Passive Preamps now!!! I have put my digital one on hold for a while...I run a passive for myself and am building one for this system too.

Your xformers won't fit...Mine are the largest I could get to go in the AB13s...but as a result, the PSU is very underpowered. But I figured that 30-40W (x2) = 60-80W isn't going to hurt the 120VA (W) xformer too much.

I have made extensive use of sticky backed bases and tie wraps so the there are no screws other than the 4 per box holding them together. Very neat - in my opinion. I should also thank Laing Utilities for the cabling, sleeving used and tie wraps! There is a perk to every job!

Gaz
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Old 28th March 2003, 09:32 AM   #6
Rarkov is offline Rarkov  England
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Hmm...Then it blew up! One of the xformer secondaries has shorted...That serves me right for listening to advice about not needing secondary fuses! I have a new 120VA 18V and 120VA 25V xformer on the way. The 18V is the preference..We'll see how it goes...I also have some fuses coming - funnily enough!

Gaz
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Old 29th March 2003, 07:29 PM   #7
Nuuk is offline Nuuk  United Kingdom
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Quote:
I am only using a 120VA xformer with 25V seconadries. I'm hoping this is going to make the voltage rails droop a couple of volts so that the 35V caps wil be in a safe operating range
25 volt secondaries will produce 36 volts (or higher depending on your local mains voltage). The safe way to work out capacitor ratings is to multiply the voltage across them by 1.25 so using caps rated at only 35 bolts is asking for trouble!
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Old 29th March 2003, 08:37 PM   #8
Rudy is offline Rudy  Belgium
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Actually with small transformers < 300 W the voltage rating could go up to 10% above the normal voltage ( this without a large load ofcourse )

but the results are ...

25 *1.1 = 27,5VAC

( 27,5VAC * 1.42) - 0.6V ( using 1 rectifier bridge that is ) = 38,5V

...

Greetz Rudy
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Old 29th March 2003, 08:53 PM   #9
Rarkov is offline Rarkov  England
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Hi,
Well after the bridge rectifier (about a 1.4V drop I would think) the measured outputs were +- 40.1V along the capacitor rails. This dropped to 38V or thereabouts with the load on.

I have reordered the transformers - but with an 18V version this time. I couldn't turn the preamp volume all the way up without the amp over heating, so this should keep things in check!

Gaz
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Old 15th April 2003, 06:40 PM   #10
Rarkov is offline Rarkov  England
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Well I've finished them and they are amazing!
The lower voltage xformer worked wonders!

Gaz
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