LJM New Small toys GC LM3886 - diyAudio
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Old 25th October 2014, 09:17 AM   #1
ljm_ljm is offline ljm_ljm  China
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Default LJM New Small toys GC LM3886

Small toys

Take a look at first.

Pictures than text easier to understand.
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File Type: jpg 1K91-3886.jpg (23.1 KB, 103 views)
File Type: jpg 1k92-3886.jpg (25.1 KB, 49 views)
File Type: jpg 19K3-3886.jpg (22.1 KB, 44 views)
File Type: jpg 19K4-3886.jpg (25.0 KB, 40 views)
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Old 25th October 2014, 09:18 AM   #2
ljm_ljm is offline ljm_ljm  China
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3886 PDF The standard circuit.

No input capacitance. Use direct input.


ljm_ljm@foxmail.com

Last edited by ljm_ljm; 25th October 2014 at 09:22 AM.
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Old 25th October 2014, 11:51 AM   #3
Philfr is offline Philfr  France
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Hi,
What difference with your LM3875 ?
I build :

Click the image to open in full size.

Please note that it's works with 28 volts, cause relay are 24 vdc.
It does the job for the cheaper price !
Why softstart with LM3886 ?
Phil.
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Old 25th October 2014, 01:09 PM   #4
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Philfr View Post
.....................Why softstart with LM3886 ?.............
Has the advertisement mentioned soft start for the LM3886?

Soft start is usually for the transformer.

Speaker isolation and delay is different.
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Old 26th October 2014, 08:19 AM   #5
Mooly is offline Mooly  United Kingdom
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Moved to Vendors forum. Please restrict all future similar posts to this one thread.

(ljm_ljm, this thread, like many of your others, seems more commercially orientated ... lack of build details, sharing of circuit information and so on)
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Old 27th October 2014, 05:12 AM   #6
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by Philfr View Post
Hi,
What difference with your LM3875 ?
I build :

Click the image to open in full size.

Please note that it's works with 28 volts, cause relay are 24 vdc.
It does the job for the cheaper price !
Why softstart with LM3886 ?
Phil.
LM3886 LM3875 they are fine.

Relay is through the half-wave rectifier, plus LM7824 for use in relay power supply.

So no problem.

LM3875 now, here I seldom buy chips.

LM3886 more. As for the voice. I think they are close to.

Maybe LM3886 speed faster.
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Old 27th October 2014, 05:17 AM   #7
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by Mooly View Post
Moved to Vendors forum. Please restrict all future similar posts to this one thread.

(ljm_ljm, this thread, like many of your others, seems more commercially orientated ... lack of build details, sharing of circuit information and so on)

In my introduction illustrates it USES LM3886 PDF circuit in detail.

It is very simple. I want to discuss this circuit. Rather than sell it at the BBS.

I don't have international account. If someone buy it from China. I would be happy to explain some problems for others.

As long as someone ask. All can get the exact answer.


Thank you very much for your help I placed it in the right place.

Because I really don't know where it should be given.



Can refer to the official information about circuit. The following diagram is introduced.

I appropriately increased input LPF, as well as Zobel network.
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Last edited by ljm_ljm; 27th October 2014 at 05:26 AM.
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Old 28th October 2014, 11:43 AM   #8
Philfr is offline Philfr  France
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Hi,
Few questions from newbie :
1 can remove Rb 1 Ko (input resistor) ?
2 gain is 21 ?
3 is that "speaker protection" works when a DC signal is at input ?
4 where buy it to China from Europe ?
5 relay is 24 vdc ?
Thank's.
Phil.
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Old 31st October 2014, 05:58 PM   #9
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by Philfr View Post
Hi,
Few questions from newbie :
1 can remove Rb 1 Ko (input resistor) ?
2 gain is 21 ?
3 is that "speaker protection" works when a DC signal is at input ?
4 where buy it to China from Europe ?
5 relay is 24 vdc ?
Thank's.
Phil.
1 don't delete R1, in fact, behind the product R1 and a capacitance. 15 pf.
It with R1 LPF filter.
2 gain = 21 voltage amplification.
3 have a dc voltage output. Will cut off the output.
4, can use the TAOBAO net. I can only use it. Can I email to ljm_ljm@foxmail.com
5. Relay use 24 v dc voltage. But it passes through a LM7824 voltage regulator IC. The half-wave rectifier.
Suggested that the transformer use AC24-0 to 24
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Old 1st November 2014, 09:37 AM   #10
Philfr is offline Philfr  France
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Hi,
Thank's for reply..
Just for info, I use 20/0/20 volts with the LM3875, and it's works well.
When you said : " the product R1 and a capacitance. 15 pf. It with R1 LPF filter."
That mean that resistor R1 have a capacitance of 15pF ?
Phil.

Last edited by Philfr; 1st November 2014 at 10:02 AM. Reason: missing
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