Схемы - Аналоговая схемотехника - 5

Stephen Woodward

Awhile back I published a simple design idea for a thermal airspeed sensor based on a self-heated Darlington transistor pair ( Ref. 1 ). See Figure 1. Figure 1. Older design idea with self-heated Darlington thermal airflow sensor. In the circuit, ...

Stephen Woodward

A classic analog application is the full-wave precision rectifier (absolute value) function. Many variations exist on this theme, each with its own supposed (often rather minor and sometimes downright dubious) advantages compared to competing ...

Stephen Woodward

A question that arises frequently in audio and signal processing applications is this: How can I control gain on dual channel (e.g., stereo) inputs simultaneously with only a single knob? Of course, an obvious solution would be to simply use a dual ...

Stephen Woodward

“The unfortunate relationship between servo systems and oscillators is very apparent in thermal-control systems,” said Linear Technology's Jim Williams ( Reference 1 ). Although high-performance temperature control looks simple in ...

Stephen Woodward

A good manually adjusted audio gain stage is characterized by: Low noise and low distortion, A 20 kHz bandwidth, A wide gain adjustment range (e.g. 90 dB), and Logarithmic (at least pseudo-logarithmic) control characteristic to Efficiently span ...

Jayapal Ramalingam

There are several applications in which pulses longer than the set width are to be detected, ignoring the other short pulses. We are familiar with the missing pulse detector circuit, which detects the occurrence of a missing pulse in a pulse train ...

Lindo St Angel

A traditional implementation of an absolute-difference function comprises a difference circuit followed by an absolute-value circuit; the entire circuit requires at least three op amps. The design problem is complicated in single-supply-only ...

Stephen Woodward

The use of multiplexer chips (typically various members of the 405x family) to control gain in transimpedance (current to voltage conversion) signal-processing and data acquisition op-amp circuits, is an established practice. Using a multiplexer ...

Francis Rodes

The need for conditioning low-level ac signals in the presence of both common-mode noise and differential dc voltage prevails in many applications. In such situations, ac-coupling to instrumentation and difference amplifiers is mandatory to extract ...

Chuck Wojslaw Gary M Craig

The control of electronic potentiometers in most today's applications comes from controller-generated signals. However, a significant number of applications exist that require adjustments using manual, front-panel controls. The circuit in ...