The clock input of the D-type is fed from a 200Hz clock built around a traditional CMOS oscillator. The CMOS switches are controlled by a D-type flip flop, one switch being connected to each output of the flip flop, thus ensuring that both switches cannot be 'on' together. The output from each capacitor is fed to a CMOS switch, and then to the LED driver. ![]() The 100R series resistor ensures that the tantalum (for low leakage) capacitor charges quickly, and hence catches short musical transients, and the 100k resistors allow this charge to leak away slowly thus giving the desired response. This will act as a peak detector with a PPM type response. This design for a stereo LED meter differs from most current designs in that only one LED driver chip is used this is multiplexed between the two stereo channels.Įach input is connected to a rectifier, followed by an RC network. ![]() All ideas and circuits presented for publication should have been proved before submission and should include a circuit diagram and explanatory text. Readers contributions can be an original feature or constructional article describing electronic or electro-musical equipment which is ideally a complete building block that will aid the circuitmaker.
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