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10mhz to 20mhz Laser Light Detector - This circuit was originally
designed to detect laser light pulses for an optical Ethernet
communications system. It has good ambient light immunity. ….(designed
by David A. Johnson) |
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10W HF Linear Amplifier - (circuit / schematic design) |
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20MHz VCSEL 3mW Laser Test Circuit - This circuit takes advantage of
some new vertical cavity surface emitting lasers (VCSEL) that don’t
require light output control circuits. The circuit shows how to drive
the device from a single high speed CMOS IC. The circuit can easily be
modified to transmit signals from kilohertz to about 50MHz. ….(designed
by David A. Johnson) |
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27MHz toy car receiver - (circuit / schematic design) |
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300v Peak To Peak Signal Generator - This circuit converts a square
wave signal to a +-150 volt output signal with fast 100nS rise and fall
times. ….(designed by David A. Johnson) |
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3W HF QRP Linear Amplifier - (circuit / schematic design) |
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5 Watt HF CW transmitter - This is a very simple 5 watt CW TX based
upon a TTL logic chip. There is just one "tricky" component and this is
Cx. This component should have an impedance of about 10 - 50 ohms at the
frequency of interest. If you wish to reduce the transmitter power,
increase the value of Cx. It is Cx which causes the square wave from the
output transistor to approximate a sine waveform. The value of Cx is the
price of simplicity in this TX.....(schematic) |
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500mW HF Linear Amplifier - (circuit / schematic design) |
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500w HF Linear Amplifier - (circuit / schematic design) |
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Active Antenna for Am-Fm-Sw - (Tony van Roon's circuit / schematic
design) |
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Active Antenna for HF-VHF-UHF - (Tony van Roon's circuit / schematic
design) |
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Broad Band 2MHz Optical Fiber Receiver - If you need more
sensitivity than the above circuit this circuit provides about ten times
more gain. It too is designed around an inexpensive plastic optical
fiber detector. ….(designed by David A. Johnson) |
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Broad Band 5mhz Optical Fiber Receiver - This circuit is a simple
broad band light detector that uses a very inexpensive IC and a PIN
photodiode that is packaged for use with plastic optical fibers. It has
a bandwidth from 1KHz to over 5MHz. It is great for experimenting with
various modulated light sources. ….(designed by David A. Johnson) |
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Build an Adjustable High Frequency Notch Filter - 02/06/03 EDN-Design
Ideas: Although you can obtain universal, resistor-programmable
switched-capacitor filters that are configurable as notch filters, most
cannot operate at bandwidths higher than 100 kHz. Furr, typically 16to
20-pin packages do not include a continuous-time, antialiasing filter to
prevent spurious signals from appearing at output.....(design
ideas) |
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CMOS Inverter Makes Low Power Amp - With the addition of one
resistor and a capacitor, some common logic ICs can be transformed from
digital to analog duties. This circuit outlines some the features to
expect from different inverter ICs. ….(designed by David A. Johnson) |
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Composite Amp Provides High Gain & Bandwidth - 04/28/94 EDN-Design
Ideas: The composite circuit in Fig 1 couples the output drive and slew
rate of a current-feedback amplifier, IC2, with the low-noise and
low-offset characteristics of a voltage-feedback operational amplifier,
IC1. The circuit achieves gains as high as 1000, while showing little
variation in frequency characteristics with gain. This circuit suits
applications..../.....(design idea) |
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Dip Oscillator for HF - (circuit / schematic design) |
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FET Input High Speed Light Detector - This circuit is yet another
design that converts current from a PIN photo diode to a voltage. It
has a bandwidth that extends beyond 50MHz. ….(designed by David A.
Johnson) |
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Flashing LED Advertising Badge #2 - This circuit is similar to
flashing LED advertising badge #1. . It uses a CD4013 dual D Flip/Flop
IC. The 74HCT74 IC in #81 does not always work. As in #81, a single
lithium battery will provide months of continuous LED flashing. It also
has a tiny push-button switch to turn on and off the light flashing.
….(designed by David A. Johnson) |
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High voltage high frequency Amplifier drives piezoelectric PVDF
transducer - 07/24/08 EDN-Design Ideas: Finding wide use in
nondestructive testing, a high-voltage, high-frequency amplifier drives
a piezoelectric PVDF transducer.....(design idea) |
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How to build Amplifier 2x30W with STK465 - A amplifier of acoustic
frequencies can be manufactured with discernible materials, despite is
known so much the difficulties of finding of materials, what the problem
of regulations. These difficulties are overcome relatively easily if we
find amplifier in form completed.....(circuit) |
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Laser Light Detector,
10mhz to 20mhz - This circuit was originally designed to detect laser
light pulses for an optical Ethernet communications system. It has good
ambient light immunity. ….(designed by David A. Johnson) |
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LF to HF Converter (Peter Parker) - This converter allows reception
of signals below 500 kHz on a 3.5 – 4 MHz HF receiver. It should
therefore be useful for those with receivers that do not receive the
lower frequencies….(electronic schematic / circuit) |
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Medium Power Wideband Amplifier for MMDS Applications 5/30/98 -
Application Note California Eastern Laboratories Doc #911 (app note) |
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N-CH & P-CH Transistor form Push-Pull Driver - This circuit can
produce high speed output signals with fast rise and full times. The
unique change pump action allows the voltage of the upper P-ch device to
range from millivolts to hundreds of volts. The output current is only
limited by the rating of the transistors. I have used this circuit
beyond 2MHz. ….(designed by David A. Johnson) |
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QRP HF Transmitter - (electronic Circuit) |
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Single-Sideband Demodulator Covers the HF Band - 10/26/00 EDN-Design
Ideas: The circuit in Figure 1 complements a previous Design Idea ( SSB
modulator covers HF band EDN , Sept 30, 1999, pg 122). The modulator
employs a phasing....(design idea) |
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Synthesized HF Receiver - (circuit / schematic design) |
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TBA120 Narrowband FM Receiver - (circuit / schematic design) |
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Wide Band RF Amplifier for 10MHz-500MHz Input - This paper describes
an RF amplifier circuit which is suitable for the frequencies between
10MHz and 500MHz. These kind of amplifiers are called wide band
amplifiers.(07/07/07) |
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Wide Band Zero Cross Detector - This circuit was designed to convert
a low amplitude 40KHz signal into a clean square wave signal. It will
work with inputs as small as 5mv peak-to-peak or as large as 3 volts
peak to peak. The input frequency can range from a few kilohertz to
about 150KHz. ….(designed by David A. Johnson) |
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Wideband AGC has 60 DB Dynamic Input Range - 10/10/96 EDN-Design
Ideas: /.....(design idea) |
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Wideband Low Distortion Techniques Apex-AN17 - Apex App Note |
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Wideband Low Noise Amplifier Drives 50 Ohm Loads - 10/23/97 EDN-Design
Ideas: /.....(design idea) |
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Wideband Op Amp Capable of µPower Operation - National Semiconductor
Application Note 24-Oct-2001 (app note) |
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Wideband peak detector operates over wide input frequency range -
11/22/07 EDN-Design Ideas: An ultra fast comparator and associated
circuitry enable peak detection over a wide input-frequency and -voltage
range.....(design idea) |
