Signal level status display circuit

Shown is a signal level status display circuit , which can be used for audio level display, for example. Multiple light-emitting diodes
are composed of multiple sets of transistor drive circuits. The number of diodes connected in series to the emitter of each drive transistor is different. The drive transistors drive the Signal level requirements are
different. The more diodes connected in series with the emitter, the signal level at their base must be higher than the junction voltage of the multiple diodes in order for the transistor to turn on. The higher the input
signal level , the more display diodes will illuminate.