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High Frequency Amplifier / High Speed Circuits / Wide Band Amplifier Circuits
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Amplifier -- Main Page
Last Updated on:
Tuesday, April 01, 2014 04:28 AM

Circuits Designed by Dave Johnson, P.E. :
 
  • 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]  Added April 2005
     
  • 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 tra … [Designed by David A. Johnson]  Added April 2005

 

  • 2Mhz Broad Band 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.  … [Hobby Corner Circuit by Dave Johnson]  Added April 2005
     
  • 3mw Laser Test - 20Mhz VCSEL - 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 tra … [Hobby Corner Circuit by Dave Johnson]  Added April 2005
     
  • 50Mhz Broad Band Optical Fiber Receiver #A - If the above circuit it still too slow, you can try this circuit. What it lacks in sensitivity it makes up for in speed. The circuit attaches a plastic fiber optic PIN photodiode assembly to a small box containing a small 3v battery and a standard BNC plu … [Designed by David A. Johnson]  Added April 2005
  • 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.
     
  • 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.
  • C-MOS 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.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
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]
10W HF Linear Amplifier -  Electroinic circuit…. [from Harry Lythall's website]
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]
27MHz toy car receiver -  (circuit / schematic design added 6/06) [Peter Jakab, Electrical Engineer, Engineer of Informatics]
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]
3W HF QRP Linear Amplifier -  Electroinic design circuit…. [from Harry Lythall's website]
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.... [from Harry Lythall's website]
500mW HF Linear Amplifier -  Electroinic design circuit…. [from Harry Lythall's website]
500w HF Linear Amplifier -  Electroinic circuit…. [from Harry Lythall's website]
Active Antenna for Am-Fm-Sw -  This simple little circuit can be used for AM, FM, and Shortwave(SW). On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna.  It is further more designed to be used on receivers that use untuned wire antennas, such as inexpensive units and car radios.... [Tony van Roon's circuit]
Active Antenna for HF-VHF-UHF -  This simple little circuit can be used for AM, FM, and Shortwave(SW). On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna.  It is further more designed to be used on receivers that use untuned wire antennas, such as inexpensive units and car radios.... [Tony van Roon's circuit]
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]
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]
Build an adjustable high-frequency notch filter -  6-Feb-03 Issue of EDN  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. Further, the typically 16- to 20-pin packages do not include a continuous-time, antialiasing filter to prevent spurious signals from appearing at the output.... [Design Idea by John Ambrose, Mixed Signal Integration Corp, San Jose, CA]
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]
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 added 04/02] EDN migrating links. This link is not verified.  Google the "title" EDN for new link.
Dip Oscillator for HF -  amateur radio construction projects…. [from Peter Parker's website]

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