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164 results found, displaying items 161 - 164
Build IF/AGC Amp With Four Parts
An IF/AGC amplifier that features an 82-dB AGC range can be built using just four active components (see the figure). It uses a simple two-transistor peak detector (the transistors, 2N3904 and 2N3906, are commonly available and low cost). The peak detector consists of Q2, a temperature-dependent current source, and Q1, a half-wave detector. Q2 is biased for a collector current of 300 µA at 27°C; the temperature...
RMS Converter Has Excellent CMR
Designs for rms converters are common, particularly the single-chip monolithic solutions. This circuit (see the figure), however, differs from the others because of its versatile instrumentation-amplifier-type differential inputs that feature excellent common-mode rejection (CMR). In addition, the circuit is built with inexpensive, generic components. The first step in input-signal processing is the differential-input absolute-value...
Filter Improves Stop-Band Rejection
Most op amps have a low output impedance at frequencies well below their closed-loop bandwidth, but as frequency increases, so does the output impedance. When the op amp is used in a Sallen-Key low-pass filter, this increase in output impedance can reduce the filter's stopband rejection. However, a simple emitter-follower buffer amplifier at the op amp's output can reduce the effects of the higher output impedance and improve the stop-band rejection. The...
What's All This Teledeltos Stuff, Anyway?
I mentioned, some time ago, that Bob Widlar used to use his "Mexican computer," namely, Teledeltos paper. This is a kind of resistive paper that you could use to make analogs or analogues of various physical items. Well, several people wrote in to ask, where can one buy some Teledeltos paper, these days? I checked around and found quickly that the last 3 places we had bought this paper were not in business any more. That's one of the problems you get when you...
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