owh..if that is the case,luckily i didnt connect it yet.Thank!!Im designing a hearing aid..my idea is to use LM4663 as a main IC instead of LM386.Can you roughly comment my idea?
but LM4663 can drive 32ohm headphones right?correct me if im wrong.My project's objective is to design a low cost circuitry which mean in the range $200.I end up with almost 15 journals relate to the hearing aid development and mostly they use class D power amplifier in their design.My task for now is to choose the right IC for my design.My earlier propose is LM 386,however it is so classic and i need something else similar.Someone from internet suggest me LM 4663 but im not familiar with class D power amplifier.Do you have any suggestion sir?Or do you want me to review more detail about my project?
The LM4663 has two class-D speaker amplifiers (that waste battery power unless you turn them off) plus two class-AB headphones amplifiers. Aren't hearing aids mono not stereo?
You should select a mono headphones amplifier without power amplifiers.
Do you know how much power you need to drive a headphone?
One of criterion to design the circuit is to drive at low voltage but 3-9 V is ok for me. Does LM4915 meet my criterion?However it only have 6dB fix gain.I need like 100dB gain.Is there
any audio IC's meet my criterion sir?Thank for the information.Really appreciate it!!
The LM4915 package is extremely tiny like most modern ICs. You won't be able to solder it.
A voltage gain of 100dB is rediculous. It is 100,000 times.
5mV from a microphone will be amplified to 500V.
A voltage gain of 60dB (1000 times) is plenty.
Use an opamp as a preamp then use a TDA2822M as a power amp. The schematic of a power amp and its pcb design is in the datasheet for the TDA2822M.
Most deaf people need the treble audio frequencies boosted so maybe the preamp can do it.
I will select the best component within this 3 days.TDA2822M will in my study list sir.
Is there any IC's similiar to LM4663?Because i need compression circuit in my design which will control the volume and amplify the soft sound only.Im also need to implement T coil and speech filter in my design.Im currently reading on some digital volume control which only use low voltage.Any comment sir?
The very old TTL logic ICs need a regulated 5V supply with a lot of current.
You will be making the oldest and biggest hearing aid ever made.
The circuit and battery will be huge.
The very old TTL logic ICs need a regulated 5V supply with a lot of current.
You will be making the oldest and biggest hearing aid ever made.
The circuit and battery will be huge.
You like old parts, don't you?
The old DS1669 digital pot is linear. A volume control is supposed to be logarithmic.
Maxim-IC have some logarithmic digital volume controls.
You like old parts, don't you?
The old DS1669 digital pot is linear. A volume control is supposed to be logarithmic.
Maxim-IC have some logarithmic digital volume controls.
What is the different between linear volume control and logarithmic volume control?I mean in the way their perform?
From my understanding,volume control suppose to be linear.If we increase the volume,the output increase in time with volume.
What is the different between linear volume control and logarithmic volume control?I mean in the way their perform?
From my understanding,volume control suppose to be linear.If we increase the volume,the output increase in time with volume.