49. How to check and eliminate self-oscillation?

Check and 49 datasheet and eliminate self-oscillation as follows:

(1) First determine the type of oscillation, is part of a continuous oscillation, transient oscillations, or intermittent oscillation, and 49 price and estimate the oscillation frequency range. Since there are basically three parts oscillating source, there amplification of the circuit, the feedback branches, wiring and 49 suppliers and components. Therefore, analysis of this order may be a major part of the oscillation. If that is the enlarged part, you can reduce the gain to see if the oscillation stops, such as the oscillation stop, you can narrow the scope to enlarge circuit; if that part of the oscillation is due to feedback, the feedback may be appropriate to reduce the depth (depth feedback can not be reduced too small, otherwise the amplifier performance improvement is to be affected). If that is the reason for wiring, you can swing wiring, to see whether changes in the oscillation; or knock move the suspected components, to see whether the frequency of oscillation changes.

(2) may in turn step by step approach to the ground with a capacitor to determine the level at which vibration source. Such as the available power capacity of the capacitor several different, the final stage of the circuit starting from the sequential forward bypass ground testing, when the level was found to bypass a stop when the oscillation, then this level may be where part of the local oscillator.

(3) the input square wave signal with an oscilloscope to put too much on the various parts of the circuit to observe, according to the square before and after the change can be roughly along the circuit to determine the stability or levels of vibration in a temporary state.

This method can also be found by accident about oscillation or oscillation of the state.