I got a old headphone amp chip namely LM4881 . It sounds great with just two Alkaline cell .
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Do you use 2x1.5V for supply?
Gives 3 Volt.
Because works between 2.7 and 5.5 Volts.
There is also a switch for shutdown.
I understand you like this headphone amp.
It is a beautiful little IC.
So, I have downloaded the datasheet: http://www.ti.com/lit/ds/symlink/lm4881.pdf
😉
Gives 3 Volt.
Because works between 2.7 and 5.5 Volts.
There is also a switch for shutdown.
I understand you like this headphone amp.
It is a beautiful little IC.
So, I have downloaded the datasheet: http://www.ti.com/lit/ds/symlink/lm4881.pdf
😉
I used two 1.5 volt battery.
470mfd input cap and 2200mfd output cap from nichicon.
Nickel MH cell giving better sound character . What might be the freaking reason?
470mfd input cap and 2200mfd output cap from nichicon.
Nickel MH cell giving better sound character . What might be the freaking reason?
Does the NiMH batteries give a change in working voltage supply? I would imagine the LM4881 should work a bit better, when the supply comes closer to max voltage supply = 5.5V. You could use 3x1.5V batteries
But to subjective get the impression 'better sound' can sometimes be only imagination. To see if there is a real change in 'sound' we must take messerment. To get some hard facts and numbers. Such things can be seen using square wave generator and oscilloscope.
What impedance does your headphones have? For 8 Ohm 2.200uF would be very right. Even if you have 32 Ohm headphones you can use 2.200uF output caps. So I would only change the input cap to a MKT 2.2uF. Eventually 4.7uF if you have.
But to subjective get the impression 'better sound' can sometimes be only imagination. To see if there is a real change in 'sound' we must take messerment. To get some hard facts and numbers. Such things can be seen using square wave generator and oscilloscope.
The input impedance is 20kOhm. So, I would use 2.2uF Polyester cap (MKT) for the input.
What impedance does your headphones have? For 8 Ohm 2.200uF would be very right. Even if you have 32 Ohm headphones you can use 2.200uF output caps. So I would only change the input cap to a MKT 2.2uF. Eventually 4.7uF if you have.
Yes they give me 1.2v . I will try three 1.5v cell and report here . I think I can be nice little portable amp.
My headphone have 36ohms impedance . I got it a week back. It is audio technica m60x . My big sis gifted me. I will try 2.2mfd . Did you got hand on this tiny little IC ? I believe you will love it. I am wondering which ic should I use to protect lithium ion battery and charge them.
My headphone have 36ohms impedance . I got it a week back. It is audio technica m60x . My big sis gifted me. I will try 2.2mfd . Did you got hand on this tiny little IC ? I believe you will love it. I am wondering which ic should I use to protect lithium ion battery and charge them.
Charge lithium ion. You should ask this in 'Power Supplies' forum. Start a thread there with a good describing subject.
There are a number of different IC to charge batteries. I do not know which is good for lithium ion.
EDIT: I did a search at my electronics supplier. They sell this one: http://www.analog.com/media/en/technical-documentation/data-sheets/1510fc.pdf LT1510CN is a 16pin DIP IC. It can charge several different batteries. Among them Lithium Ion.
There can be some more simple IC. I am sure
What I found in the web: MCP-73831 is one of many cheap integrated Li-Ion chargers available on the market. SOT-23 package, cost: < 1USD. That one seems to be simple and good. And small. PDF: https://www.sparkfun.com/datasheets/Prototyping/Batteries/MCP73831T.pdf enjoy!
There are a number of different IC to charge batteries. I do not know which is good for lithium ion.
EDIT: I did a search at my electronics supplier. They sell this one: http://www.analog.com/media/en/technical-documentation/data-sheets/1510fc.pdf LT1510CN is a 16pin DIP IC. It can charge several different batteries. Among them Lithium Ion.
There can be some more simple IC. I am sure
What I found in the web: MCP-73831 is one of many cheap integrated Li-Ion chargers available on the market. SOT-23 package, cost: < 1USD. That one seems to be simple and good. And small. PDF: https://www.sparkfun.com/datasheets/Prototyping/Batteries/MCP73831T.pdf enjoy!
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