démodulateur FM à PLL utilisant un CA3089

If not always for exclusively technical reasons, output level meters are a particularly popular type of circuit, especially in audio applications (power amps etc.) The circuit de-scribed here is for a moving coil meter with an aut oranging facility. The meter will read from -40 to -20 dB, and from -20 dB to O dB; two LEDs indicate which range is selected (see figure 1 ). By adopting this approach the resolution of the meter is considerably improved.