Schematic DIY KitMessgeraet Current, voltage, frequency, and much more
Measurement has a central place in the electronics lab. Without appropriate devices such as spectrum analyzer or oscilloscope many circuits are not feasible. Here is a series of links with circuits that deal with measurement

Here you will find Schematic Circuit Diagram for DIY and further information on Messgeraet
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Comprehensive building instructions for a True RMS audio voltmeter www.theimann.com/Analog/Misc_Tech/Millivoltmeter
True RMS with Voltmeterschaltung Operationsverstaerkern www.national.com/ms/LB/LB-25.pdf
Fine frequency counting project to 100MHz
With LCD and microcontroller control
www.linuxfocus.org/Deutsch/September2002/article253.shtml

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