translation
yes I mounted the sinks later, before trying it, do I want me to send you more defined photos? I did so I only made one channel work, of course that's what I don't understand, it's that simple !! you could use some pcb already made but at that point there is no more fun, but the strange thing is that I have already assembled them in the past and they worked properly, I also mounted a 3886 and it worked very well, after a while I have it went to get it didn't work anymore, it's a mystery
yes I mounted the sinks later, before trying it, do I want me to send you more defined photos? I did so I only made one channel work, of course that's what I don't understand, it's that simple !! you could use some pcb already made but at that point there is no more fun, but the strange thing is that I have already assembled them in the past and they worked properly, I also mounted a 3886 and it worked very well, after a while I have it went to get it didn't work anymore, it's a mystery
I think we can see enough from what have sent. It is very neat...
The chip should really have some decoupling close up to the pins. It might be worth add a small cap (say 47uF) directly between the two supply pins on each chip. Make sure the voltage rating of the cap is suitable if you try this.
Also measure the voltages on the chip as I mentioned earlier.
The chip should really have some decoupling close up to the pins. It might be worth add a small cap (say 47uF) directly between the two supply pins on each chip. Make sure the voltage rating of the cap is suitable if you try this.
Also measure the voltages on the chip as I mentioned earlier.
It was just from the web but it is a standard circuit. Component values might be a little different between differing designs but they all follow the standard pattern for a classic chip amp.
The first part is a volume control.
The 22k sets the input impedance.
The Wima cap can be a small electrolytic.
The 18k and 1k set the gain. You can use a 22k and a 1k or a 22k and an 820 ohm.
The 22uF AC couples the feedback network and reduces the gain to '1' at DC. 10uf, 22uF, 47uF. Any will work.
The 1 meg isn't needed as drawn. If you don't fit a volume control then fitting it is good practice.
The chip must be decoupled close to the pins. This is VERY IMPORTANT. So try adding a single cap across the supply pins.
The zero volt connection to the power supply is to be made to the RIGHT of the speaker so that the speaker current doesn't flow in any of the ground connections to the chip.
The 22k sets the input impedance.
The Wima cap can be a small electrolytic.
The 18k and 1k set the gain. You can use a 22k and a 1k or a 22k and an 820 ohm.
The 22uF AC couples the feedback network and reduces the gain to '1' at DC. 10uf, 22uF, 47uF. Any will work.
The 1 meg isn't needed as drawn. If you don't fit a volume control then fitting it is good practice.
The chip must be decoupled close to the pins. This is VERY IMPORTANT. So try adding a single cap across the supply pins.
The zero volt connection to the power supply is to be made to the RIGHT of the speaker so that the speaker current doesn't flow in any of the ground connections to the chip.
The cap goes between pin 3 and pin 5. Make sure to get polarity correct and the voltage rating must be more than your total rail voltage.
The data sheets have worked examples although sometimes they can be a bit to basic and omit important things like Zobel networks.
This is a well regarded site. Lots of stuff on here if you are interested in chip amps.
Building a non-inverted Gainclone chip amp with the LM3886 chip.
This is a well regarded site. Lots of stuff on here if you are interested in chip amps.
Building a non-inverted Gainclone chip amp with the LM3886 chip.
Hi everyone,
I wanted to tell you that I found a broken cable on the power supply, I was hoping to have fixed it, the noises are gone, but it sounds soft and distorted
, cmq that broken cable was a cause of the malfunction of a 3886 made some time ago, now it's okay. a speaker anyway I had broken it.
I wanted to tell you that I found a broken cable on the power supply, I was hoping to have fixed it, the noises are gone, but it sounds soft and distorted
, cmq that broken cable was a cause of the malfunction of a 3886 made some time ago, now it's okay. a speaker anyway I had broken it.
thanks mooly, unfortunately the 1875 doesn't work yet, it sounds soft and very distorted, but it is a mystery, such a simple circuit.
Are the voltage on chip correct?
All pins apart from the two supplies should be at zero volts DC.
All pins apart from the two supplies should be at zero volts DC.
Just check they read approximately zero volts DC, and that is especially important for the output pin as you do not want any DC voltage across the speaker.