Showing posts with label METER. Show all posts
Showing posts with label METER. Show all posts
Monday, May 31, 2010
20 LED AUDIO VU METER
This circuit has 3 main sections, an inverting op-amp amplifier, a rectifier and LED display. The input can be from almost any low level source, but if not using an electret microphone, then omit R1 as it's not necessary. The gain of the amplifier based around IC1 is controlled by VR1. The output is rectified by D1,2 and filtered using C4,R6.The final stage is a standard design for the LM3914. Alter R8 to control LED brightness but be careful not to over-drive the IC's. It's recommended that you don't
Tuesday, December 15, 2009
PIC LCF METER
This simple PIC-based unit was designed to measure and display the values of inductors and capacitors.
As a by-product of the technique used, it can also display the frequency of an external 0V / +5V signal source.
Capacitance: 1pF to 6500mFInductance : 1mH to 10H
Frequency : 0,05Hz to 5MHz
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