Nescafe
New Member
Hi All,
I have some questions regarding op amp audio buffer from the given schematic:
1. If the C1 around 220-1000uF & R1 100K, which is the better op amp for U1, BJT or FET input? With the Z behaviour of cap along with the frequency change, would You like to inform me what is the ideal one BJT input (low noise voltage) or FET input (low noise current)?
2. For C1 and C2, with value around 220uF-1000uF what is the right/correct electrolytic capacitor rated voltage needed (I have try with 6.3V, 16V & 35V and all are seems work?)? I'm aiming the phase shift at 10Hz as low as possible that's why I use large value cap but I'm not sure what voltage is the correct one, any direction how to calculate it?
Any reply, help, and explanation are really appreciated.
Thank You.
I have some questions regarding op amp audio buffer from the given schematic:
1. If the C1 around 220-1000uF & R1 100K, which is the better op amp for U1, BJT or FET input? With the Z behaviour of cap along with the frequency change, would You like to inform me what is the ideal one BJT input (low noise voltage) or FET input (low noise current)?
2. For C1 and C2, with value around 220uF-1000uF what is the right/correct electrolytic capacitor rated voltage needed (I have try with 6.3V, 16V & 35V and all are seems work?)? I'm aiming the phase shift at 10Hz as low as possible that's why I use large value cap but I'm not sure what voltage is the correct one, any direction how to calculate it?
Any reply, help, and explanation are really appreciated.
Thank You.