Sensors / Detectors:
Peak Detectors
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Sensors / Detectors -- Main Page
Last Updated on:
Monday, October 03, 2011 06:07 PM |
| Circuits Designed by Dave
Johnson, P.E. : |
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AIR TRANSPARENCY MONITOR, XENON FLASH RECEIVER
I designed this circuit many years ago to monitor the quality of a mile long column
of air for future optical communications experiments. The transmitter system
(circuit 72 below) uses a powerful xenon flash in conjunction with a large 12 inch
Fresnel lens at the transmitter end and a matching 12-inch lens with a PIN photo
diode at the receiver. The receiver system was connected to a weather station and a
computer to collect the changes in intensity of the light flashes under different
weather conditions. It has the potential for a 30+-mile range. I have also used this
system to conduct cloud bounce experiments.
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- Audio
Signal Detector Switch
This circuit will activate a transistor switch when it detects at least 50mv peak to
peak of an audio signal. It could be used to turn on a relay, routing the
signal to were it is needed. (added 7/06)
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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A Field Strength Indicator-Analog only - (schematic / circuit
added 6/07) |
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A Low Cost Thermal Peak Detection NiCd Charger - The electric
model aircraft and car industries have produced a bewildering array of field
chargers for NiCd motor battery packs. These range from simple 6 or 7 cell
chargers consisting of a resistor and mechanical timer, to more complex
chargers with peak detection, cycling, and the ability to handle 36 cell
packs.... [Stefan Vorketter] |
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AC Current Probe for Oscilloscope Use - (schematic / circuit added
6/07) |
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Air Transparency Monitor, pg 1 - I designed this circuit many
years ago to monitor the quality of a mile long column of air for future
optical communications experiments. The transmitter system (circuit 72
below) uses a powerful xenon flash in conjunction with a large 12 inch
Fresnel lens at the transmitter end and a matching 12-inch lens with a PIN
photo diode at the receiver. The receiver system was connected to a weather
station and a computer to collect the changes in intensity of the light
flashes under different weather conditions. It has the potential for a
30+-mile range. I have also used this system to conduct cloud bounce
experiments.... [Designed by David A. Johnson] |
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Air Transparency Monitor, pg 2 - This is Page 2 of the air transparency
monitor receiver circuit.... [Designed by David A. Johnson] |
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Analog Switch Cuts Peak Detector Reset Time - 05/25/95 EDN-Design
Ideas....The schematic in Fig 1 is a basic configuration for a unity-gain peak
detector using the PKD-01FP monolithic peak detector from Analog Devices. The reset
time, tRES, is the time necessary to discharge the hold capacitor CH. tRES and
the acquisition time tACQ are functions of the IC's output-current capability. With
CH10 nF, this output-current limitation sets both tRES and tACQ to about 220 �sec....
[Design Idea by Gualtiero Bolognesi, Landis & Gyr, Peschiera Borronmeo, Italy] |
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Audio Peak Reading Meters - (electronic schematic / circuit added 4/02)
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Audio Signal Detector/Switch - For some audio systems it is desirable to
have an automatic switch circuit turn on other devices, such as an amplifier, if an
audio signal is detected on one line. The hobby circuit below will activate a
transistor switch when it detects at least 50mv peak to peak of an audio signal.
The switch could be used to turn on a relay, routing the signal to where it is needed.
A single 3v lithium cell will power the electronic circuit for about 5 years. ….
[Hobby Corner Circuit by Dave Johnson] |
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Digital Lock-in Milliohmmeter - (schematic / circuit added 6/07)
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Digital RF Field Strength Indicator - (schematic / circuit added 6/07)
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Dual Polarity Peak Detector operates from Single Supply - 05/12/94 EDN-Design
Ideas....The circuit inFig 1 can detect the peak of either positive or negative
inputs, yet it operates from a single supply. The circuit uses two unity-gain
amplifiers to monitor the input signal, one an inverting amplifier and the other a
noninverting amplifier. A typical application is driving a VU meter.... [Design Idea
by Chester Simpson, National Semiconductor, Santa Clara, CA] |
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Fast Amplifiers Simplify AC Measurement - 05/09/96 EDN-Design Ideas.... EDN
is migrating links. This link is not verified. Search the "title" + "EDN" for
new link. |
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Fast Audio Peak Limiter - This peak limiter is simple and very effective.
Uses discrete FET gain control (circuit / design added 8/03) |
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Field Strength Indicator-Analog only - (circuit schematic added 6/07)
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High-speed peak detector uses ECL comparator - 26-Sep-02 Issue of EDN
Professional electronics designers often use peak-detector circuit sin such
applications as amplitude measurement, automatic gain control, and data regeneration.
You can build a simple and fast peak detector from a serial diode and a shunt
capacitor, but it suffers from serious inaccuracy that stems from the diode's
forward-voltage drop.... [Design Idea by Przemyslaw Krehlik and Lukasz Sliwczynski,
Institute of Electronics, Krakow, Poland] |
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Sensors /
Detectors: Peak Detectors:
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