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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, August 18, 2015 06:51 AM

Circuits Designed by Dave Johnson, P.E. :

High Frequency Amplifier Circuits

 

  • 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 . . . [Circuit by Dave Johnson P.E.,  06/14/00]

  • 10Mhz to 20Mhz Light Receiver  -  Light power to volts conversion = APPROX. 15mV per microwatt at 850nM . . . [Circuit by David Johnson P.E.,  07/11/06]

  • 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 . . . [Circuit by Dave Johnson P.E.,  06/17/00]

  • 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 Circuit designed by David A. Johnson P.E.,  06/09/00]

  • 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 . . . [Hobby Circuit designed by Dave Johnson P.E.,  06/17/00]

  • 50/60Hz Sync Generator-Fully Isolated  -  This circuit will produce a single pulse at the zero voltage cross points of the power line voltage.  An opto-coupler provides a very safe 5KV isolation . . . [Circuit by David A. Johnson P.E.,  12/12/04]

  • 50Mhz Broad Band Optical Fiber Receiver Version 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 . . . [Circuit by David Johnson P.E.,  06/04/00]

  • 5Mhz Broad Band  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 . . . [Circuit by David A. Johnson P.E.,  06/04/00]

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

±120V Output Precision Op Amp -  Simple shunt regulators provide normal supply levels to the op Amp and the external open-loop gain and buffer structure extends the output swing to nearly the high-voltage rails. Output transistors are protected by current-limiting.… [Linear Technology App Note - , Jun 21, 2011]

 

1 Watt Class-C Amplifier -  schematic only, no circuit description… [Charles Wenzel (unless otherwise noted)]

 

100W HF QRO linear Amplifier with Motorola MRF454 -  Schematic only, no circuit description… [© 2001 - YO5OFH, Csaba Gajdos]

 

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 . . . [Circuit by Dave Johnson P.E.,  06/14/00]

 

10Mhz to 20Mhz Light Receiver -  Light power to volts conversion = APPROX. 15mV per microwatt at 850nM . . . [Circuit by David Johnson P.E.,  07/11/06]

 

10W HF Amplifier with KT907 -  Schematic only, no circuit description… [© 2001 - YO5OFH, Csaba Gajdos]

 

10W HF Linear Amplifier -  This project and your efforts will provide you with a 0.55...3 watt input to easily 10 watt output. The two linear Amplifiers are ment for use with QRP SSB/CW/FM/AM transmitters on the amateur bands 15 and 17 meters can be powered from a 12 volt DC supply. The design is a good balance between output power, physical size. The completed Amplifier will reward the builder with a clean, more powerful output signal for a QRP rig when radio conditions become marginal. It has a RF-sensing circuit (Q2) wich allows the Amplifier to switch on automatically when transmitting. This project uses a "classic" RF transistor. MOSFET power Amplifiers are discussed and build in the near future on this website.… [(c)1999-2013 Guy Roels ON6MU]

 

1296MHz high gain Amplifier -  Schematic only, no circuit description… [© 2001 - YO5OFH, Csaba Gajdos]

 

13cm power Amplifier -  Schematic only, no circuit description… [© 2001 - YO5OFH, Csaba Gajdos]

 

1Hz to 10kHz Voltage to Frequency Converter -  JFET inputs with anti phase-reversal circuitry allow the LTC1055/56 to be used as a precision, ultra-high impedance comparator. The precision provides for very high linearity of the V/F generation while the high speed allows a large frequency range of operation.… [Linear Technology App Note - , Jun 21, 2011]

 

1W HF QRP -  Schematic only, no circuit description… [© 2001 - YO5OFH, Csaba Gajdos]

 

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 . . . [Circuit by Dave Johnson P.E.,  06/17/00]

 

23cm 20W PA with M57762 -  Schematic only, no circuit description… [© 2001 - YO5OFH, Csaba Gajdos]

 

23cm 40W PA with M57762 -  Schematic only, no circuit description… [© 2001 - YO5OFH, Csaba Gajdos]

 

25W QRO with PL504 -  Schematic only, no circuit description… [© 2001 - YO5OFH, Csaba Gajdos]

 

27MHz toy car receiver -  RF circuits are not easy to build. The purpose of this page is to make the circuit diagrams available for educational purposes. I won't be able to help you contructing them or give more info than what is written on this page.… [Peter Jakab, Electrical Engineer, Engineer of Informatics]

 

2m power Amplifier -  Schematic only, no circuit description… [by LA0 DF9PY]

 

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 Circuit designed by David A. Johnson P.E.,  06/09/00]

 

3.3V Baseband Video Splitter/Cable Driver (DC Coupled) -  A simple video splitter application using an LT6206. Both Amplifiers are driven by the input signal and each is configured for a gain of two, one for driving each output cable. Here again careful input biasing is required (or a negative supply as suggested previously).… [Linear Technology App Note - , Mar 25th 2010]

 

3.3V Single Supply LT6551 RGB Plus SYNC Cable Driver (DC Coupled) -  The LT6551 drives four cables and operating from a single 3.3V supply. The inputs need to have signals centered at 0.83V for best linearity. This application would be typical of standard-definition studio-environment signal distribution equipment (RGBS format).… [Linear Technology App Note - , Mar 25th 2010]

 

350W QRO with GK71 for 160-15m -  Schematic only, no circuit description… [© 2001 - YO5OFH, Csaba Gajdos]

 

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 . . . [Hobby Circuit designed by Dave Johnson P.E.,  06/17/00]

 

400MHz, 5V Single Supply Video Driver (AC Coupled) -  The LT6557 400MHz triple video driver is specifically designed to operate in 5V single supply AC-coupled applications as shown. The input biasing circuitry is contained on-chip for minimal external component count. A single resistor programs the biasing level of all three channels.… [Linear Technology App Note, Mar 25th 2010]

 

432 MHz kilowatt Amplifier -  Schematic only, no circuit description… [by W1QWS]

 

5 Watt HF CW transmitter##

 

50/60Hz Sync Generator-Fully Isolated -  This circuit will produce a single pulse at the zero voltage cross points of the power line voltage.  An opto-coupler provides a very safe 5KV isolation . . . [Circuit by David A. Johnson P.E.,  12/12/04]

 

500mW HF Linear Amplifier -  Site is gone, anybody have a new URL?… [from Harry Lythall's website]

 

50Mhz Broad Band Optical Fiber Receiver Version 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 . . . [Circuit by David Johnson P.E.,  06/04/00]

 

50MHz power Amplifier -  Schematic only, no circuit description… [by JH0WJF]

 

5Mhz Broad Band  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 . . . [Circuit by David A. Johnson P.E.,  06/04/00]

 

5W QRP with KT907 -  Schematic only, no circuit description… [© 2001 - YO5OFH, Csaba Gajdos]

 

700kHz, 1MΩ Single Supply Photodiode Amplifier -  The measured output noise for this circuit was 153uVrms measured on a 1MHz bandwidth. Supply current was a low 2.2mA.… [Linear Technology App Note - , Mar 22, 2010]

 

80m hexfet power Amplifier -  Schematic only, no circuit description… [by W7ZOI]


          Hi-Frequency circuits:     #'s       A - G        H - T      U - Z


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