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Super Gainclone With Klever Klipper Based on Cordell Design
Super Gainclone With Klever Klipper Based on Cordell Design
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Old Today, 06:51 PM   #61
ziffel is offline ziffel
diyAudio Member
 
Join Date: Nov 2016
Hi MexMike,

Thank you very much. Thanks for the tip on the L7818 latch-up.

I'm very fond of tube amps, but I don't know how important the Klever Klipper is. Perhaps I can tack it up on a separate board and try it.

Which version of the board do you prefer, the polygons or regular?

Also, are you implementing the mute function?
I was going to add a cheap Ebay UPC1237 delay/dc protection board.

Thank you again and best wishes
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Old Today, 09:38 PM   #62
mexmike is online now mexmike  Mexico
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Join Date: Mar 2018
Location: Mexico
Quote:
Originally Posted by ziffel View Post
Hi MexMike,

Thank you very much. Thanks for the tip on the L7818 latch-up.

I'm very fond of tube amps, but I don't know how important the Klever Klipper is. Perhaps I can tack it up on a separate board and try it.

Which version of the board do you prefer, the polygons or regular?

Also, are you implementing the mute function?
I was going to add a cheap Ebay UPC1237 delay/dc protection board.

Thank you again and best wishes
I've uploaded a new video of the SGC. It's the same song from Youtube as my other two videos which haven't been banned yet. Maybe good for comparison with my DIY SC200 which I love dearly. Why would Youtube ban a video from its own site? Sounds daft but maybe I'm missing something!
YouTube

I made the mistake of using a Log potentiometer for the Klipper, so nothing happens until the last bit of rotation. I wanted to see if it would be a good amp to use with guitar; adjusting the klipper way ahead of rail voltage to suit. With normal music input, it sounds like the signal is getting attenuated to me, so I decided to forgo it. Bob Cordell has a 1k resistor R1 at the Klipper. It just appears to attenuate the signal, so I omitted it to keep the total resistance of 10.1k at that point in the circuit the same, with or without Klipper. You could maybe use a header there and switch on and off as you choose.

I think the polygons are better; less copper to etch. Just be really carefull of the traces at the LM3886 and some of the smaller caps, they are close. Maybe the gurus can maybe give some input regarding the two versions of my layout, as I am not an expert. The printout is for laser toner obviously.

For the inductor, I went for as close to the 3.3uH as I could get; somewhere near 2.2uH. I used the same inductor design as per the SC200 article. This is basically 1 meter of 1.25mm dia copper wound on a 10mm ID bobbin, 8mm wide. First 7 wraps, then 6.5 wraps. I found a cardboard tube exactly that diameter, did the first 7 wraps and then poured a little superglue over the coils. let it dry, unstuck my fingers and then gingerly did the second 6.5 wraps. You can omit the finger sticking part if you like The 10 Ohm 5W resistor fit perfectly inside the tube. I then had a gash piece of plastic tube that fit exactly over the inductor wraps, followed by more superglue just to keep the inductor nice and solid.

I always use the mute with a switch as I'm too chicken to risk my speakers when testing. I first use a tiny PC speaker before using my Elac and I like to have the switch close by in case something goes tits! I also bought some cheap speaker protection which work great! You can use the 15-18V from the onboard power if you want but I prefer to use a transformer with the additional low voltage windings. for that.

Hope this helps.

Last edited by mexmike; Today at 09:43 PM.
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Old Today, 10:38 PM   #63
ziffel is offline ziffel
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Join Date: Nov 2016
Wow! That's great that you posted videos comparing the two amps. Which one do you prefer so far?

My speakers are homemade Peerless-Scanspeak MTM. The impedance get down to as low as 3 ohms, so I'm a little concerned about stressing an amp. I currently use a tube SE 845 and Class-D TK2050. The 845 is magic.

Thank you for the details on managing without the Klipper and about the inductor.
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Old Today, 11:21 PM   #64
mexmike is online now mexmike  Mexico
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Join Date: Mar 2018
Location: Mexico
Quote:
Originally Posted by ziffel View Post
Wow! That's great that you posted videos comparing the two amps. Which one do you prefer so far?

My speakers are homemade Peerless-Scanspeak MTM. The impedance get down to as low as 3 ohms, so I'm a little concerned about stressing an amp. I currently use a tube SE 845 and Class-D TK2050. The 845 is magic.

Thank you for the details on managing without the Klipper and about the inductor.
The problem with building something, is that it becomes your baby and it’s a little hard to be objective.

The SC200 is probably one of the best amps of the "Blameless" ilk as it has gone through many iterations. I believe it started out as the Studio 350 or something but not sure. I love it with a passion. It sounds amazing but I didn't design the layout or make the PCB, as they are from the wonderful folk down under at Silicon Chip magazine; really cheap boards and so well made. I had a slight problem with the SC200 build after frying a few parts due to removing a test lead with power on. Thanks to Bao, John and Nicholas at SC Magazine all is now well and I love the amp for not going into the bin but into a massive Aly chassis in my living room.

The SGC on the other hand is something I wanted to build from scratch. Thanks to the kind input from the guys in this thread and much internet delving, I managed to "join the dots" and produce something that makes sound. Whether it is a good sound to anyone else is not for me to decide but my well bashed ears from years in helicopter maintenance tells me that both amps are superb. One does the business through several transistors and the other through an IC. With both amps, the Youtube song that I play through them on Youtube, says it all! (love this Metallica song) At the beginning of the song you listen to the soft guitar and sit a little too close to the speaker, then suddenly the base kicks in and you realise how high you have the volume turned up and have to back away. So solid clear and crisp in every way.

I’ll be doing my own SC200 at some point, bought the copper vias from a nice chap in Greece, just need to finish my version of the layout.

So, to finally answer your question, I don’t have a preference. I luv em bof and muchly so!

As everyone here says. Keep the rail voltage low on the LM3886 for low Ohm speakers. Not sure if the LM3886 will be cool with 3 Ohms. The SC200 is guaranteed stable down to 4 Ohms. Make two more speakers and put them in series!

Good luck and Seasons Greetings to you and Yours.

Last edited by mexmike; Today at 11:24 PM.
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