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2 op amps provide averaged absolute value - 30-Oct-03 Issue of EDN
The circuit in Figure 1 is useful when you need amplitude demodulation or
an averaged absolute-value conversion. The circuit comprises two stages,
the first of which, IC1A, is a differential-output absolute-value
converter. The second stage, IC1B, is a traditional differential
amplifier. The combination of the two stages performs single-ended
absolute-value conversion but only if R3>>R2.... [Design Idea by Dobromir
Dobrev, Jet Electronics, Sofia, Bulgaria]
324 OpAmp Stall-Motor Switch Machine Drivers - The circuits on this page are
switch machine drivers that can be used to operate Stall-Motor type switch machine
motors. The circuits use LM324 Quad or 358 Dual operational… [from Rob Paisley's Model
Train web site]
741 Op-Amp Tutorial - What exactly is an OPerational AMPlifier? Let's define what
that component is and look at the parameters of this amazing device. An operational
amplifier IC is a solid-state integrated circuit that uses external feedback to
control its functions. It is one of the most versatile devices in all of electronics.
The term 'op-amp' was originally used to describe a chain of high performance dc
amplifiers that was used as a basis for the analog type computers of long ago. The
very high gain op-amp IC's our days uses external feedback networks to control
responses. The op-amp without any external devices is called 'open-loop' mode,
referring actually to the so-called 'ideal' operational amplifier…. [written by Tony
van Roon]
