machael
Member level 2
I designed a power amplify circuit using LM1875. Unfortunenately, I met the problem of high frequency osscillation 
. Now I found such words in LM1875's datasheet:
"Occasionally, current in the output leads (which function as
antennas) can be coupled through the air to the amplifier
input, resulting in high-frequency oscillation. This normally
happens when the source impedance is high or the input
leads are long. The problem can be eliminated by placing a
small capacitor (on the order of 50 pF to 500 pF) across the
circuit input."
I wonder what the last "across the circuit input" means? Somebody told me it means I should place the small capacitor between the pins of V+ and V- of LM1875, is that right?
Thank you!
. Now I found such words in LM1875's datasheet:"Occasionally, current in the output leads (which function as
antennas) can be coupled through the air to the amplifier
input, resulting in high-frequency oscillation. This normally
happens when the source impedance is high or the input
leads are long. The problem can be eliminated by placing a
small capacitor (on the order of 50 pF to 500 pF) across the
circuit input."
I wonder what the last "across the circuit input" means? Somebody told me it means I should place the small capacitor between the pins of V+ and V- of LM1875, is that right?
Thank you!
