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Old 21st November 2013, 06:00 AM   #2581
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Quote:
Originally Posted by davym View Post
Post some then!

As Andrew T would no doubt say, safety first - second and last.

No idea what kind of footwear he favours Bob, but if I had to guess, I'd say safety boots
There,

Click the image to open in full size.

Where is yours?

And yes, it is AGAIN a LME49811 and so on...
I am not going to answer any questions because of the contract reasons, so DO NOT ASK!
This design was sold.
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Old 21st November 2013, 09:38 AM   #2582
bcmbob is offline bcmbob  United States
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Nice looking amp, but if it's not DIY project oriented I don't understand the purpose of posting the photo. I say that not to be small minded, but it appears to be an interesting combination of through hole and SMD technologies.

Maybe you could post a non-commercial version and let us have at it. Looks like it could be fun to build and produce high quality stable sound.

Congrats on the sale. That's a dream scenario/result for most of us in this DIY community.
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Last edited by bcmbob; 21st November 2013 at 09:43 AM.
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Old 21st November 2013, 11:27 AM   #2583
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Closest match is this:
Testboard LME49830
Although with the sister chip...
Untested board.
Discussion of similar implementations / suggestions of improvements in there please.
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Old 21st November 2013, 11:48 AM   #2584
bcmbob is offline bcmbob  United States
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Old 21st November 2013, 01:09 PM   #2585
gadut is offline gadut  Indonesia
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I can't find CL60 here, while the softstart kit is so cheap $3 only, I like the design of utilizing 2 relays, I think it's for safety in case 1 relay is failed. I changed the relay to omron and elco to pan fc, others seem good. I count it gives start up delay around 2sec

Picture should be able to tell more than I can explain

ahh..just find out that I have not cleaned the pencil marking yet on heatsink
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Last edited by gadut; 21st November 2013 at 01:12 PM.
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Old 21st November 2013, 02:28 PM   #2586
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Quote:
Originally Posted by gadut View Post
I can't find CL60 here, while the softstart kit is so cheap $3 only, I like the design of utilizing 2 relays, I think it's for safety in case 1 relay is failed. I changed the relay to omron and elco to pan fc, others seem good. I count it gives start up delay around 2sec

Picture should be able to tell more than I can explain

ahh..just find out that I have not cleaned the pencil marking yet on heatsink

Softstart circuits usually have 2 relays. One of them turns the whole thing ON connecting the load through NTC resistors, and after a short while (2-5 sec) the second relay bypasses them for a straight path.
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Old 22nd November 2013, 08:12 PM   #2587
davym is offline davym  Scotland
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Here you go palstanturhin, since you asked!

My Ref FE's, just finished them. Shame i cant seem to use them with my DCB1 though, too much hum, not enough solutions.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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Old 22nd November 2013, 09:00 PM   #2588
troystg is offline troystg  United States
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Very nice!!!
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Old 22nd November 2013, 09:05 PM   #2589
davym is offline davym  Scotland
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Thanks Troy!

They will be even better if I can track down the cause of that hum issue.
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Old 22nd November 2013, 10:45 PM   #2590
udailey is offline udailey  United States
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Default Ok, I'll post some pics

I just finished a set of LM3886 amps. Not in a chassis yet.
They use LDRs as Ri and Rb at 1k and 680R. Input resistor to ground is a 22k Spicer wirewound.
Non-inverting.
Rf is a Vishay S102 at 20k. Caps are Nichicon FG and FW.
I fitted the delay circuit with the Zener at 14V and a 6k8 resistor from negative to mute pin.
Zobel is made of 4x higher value resistors. If there was any inductance in the resistors its now down by a lot. .1uf zobel cap is underneath and is just a good quality Epcos. I had one of those russian K73 or K75, forget which, but this sounds better.
LDRs are driven by LM334 and they get their regulated voltage via a 3k resistor to a 6v8 zener. LDRs have a small electrolytic and .1uf ceramic in parallel with their LED side.
I have to say I was completely blown away from the first few notes. This is the best sounding LM3886 I've built to date. I wish I could compare with my old MyREF but I sold it. I dont remember being this stunned by the MyREF though.
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File Type: jpg 20131121_122327.jpg (406.6 KB, 214 views)
File Type: jpg 20131122_160706.jpg (934.0 KB, 256 views)
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