Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 45,000+ electronic circuits, cross-referenced into 500+ categories.
We have searched the web to help you find quick solutions & design ideas.

Got Designs?
Please eMail
if you want me to link to and/or post your original design
NOTE:  We make every effort to link to original material posted by the designer. 
Please contact us if our link is not to your site!  Thanks.

Transistor Circuits, Page 4
Transistors:  #'s    A     B-C     D-G     H-I     J - O     P -     T - Z
Last Updated on: Wednesday, June 02, 2021 05:07 AM

Circuits Designed by Dave Johnson, P.E. :
  • 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.

  • FINGER TOUCH ACTIVATED SWITCH
    It does not get any easier if you want a solid-state switch that is activated by the touch of a finger. Two small metal pins route voltage through the finger skin to a MOSFET switch. The circuit is great for situations where a membrane type mechanical switch is not desired.

Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students & inventors:
Designing VCOs & Buffers Using the UPA family of Dual Transistors 3/99  -  Application Note California Eastern Laboratories Doc #927....[App Note]
Determining MOSFET Driver Needs for Motor Drive Applications -  Microchip Application Note Published 31-Dec-03  (app note added 2/06)

Differential EPAD MOSFET Matched-Pair Circuit with Buffered & Summed Outputs -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc....[App Note]
Differential EPAD MOSFET Matched-Pair Circuit with Summing Output -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc....[App Note]
Diode-Connected EPAD MOSFET with Buffer Amplifier Output -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc....[App Note]
E-B-C Transistor Pin Identifier -  Tests transistors and diodes for polarity Simple circuitry 9V Battery operation (added 2/05)
Equivalent Transistors -  (circuit / schematic design added 6/06)
FET audio mixer (Aaron Cake) -  This simple circuit mixes two or more channels into one channel (eg. stereo into mono)....(circuit / schematic design added 7/02)
FET biasing targets battery-powered PWM applications -  21-Nov-05 Issue of EDN  Reference provides constant bias voltage regardless of supply-voltage variations.... [Design Idea by Steve Franks, Franks Development LLC, Tucson, AZ; Edited by Brad Thompson and Fran Granville]
 
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]
FET Preamp Cable -  ....
 
Finger Touch Activated Switch -  It does not get any easier if you want a solid-state switch that is activated by the touch of a finger. Two small metal pins route voltage through the finger skin to a MOSFET switch. The circuit is great for situations where a membrane type mechanical switch is not desired. …. [Designed by David A. Johnson]
FM Transmitter -  A compact 2 transistor transmitter for use at VHF frequencies…. [Andy Collison]
Full Featured Transistor Tester -  Just the thing to check the transistors for any project ....
Fuzz-box -  All-FET design.  Valve-like distortion behavior (added 3/05)
Gate-drive method extends supply's input range -  26-Jun-03 Issue of EDN  Industrial and telecom applications often require a nonisolated, low-voltage supply from a high-voltage input. IC manufacturers have responded to that need with the application of high-voltage processes and offer control ICs that work to 50V and higher. That voltage is sometimes insufficient, and you need further design techniques to extend the input voltage.... [Design Idea by John Betten and Robert Kollman, Texas Instruments, Dallas, TX]
Transistors:  #'s    A     B-C     D-G     H-I     J - O     P -     T - Z


HOME Schematics Index Hobby Corner Dave's Circuits Contact Info
Imagineering Ezine Dave Johnson & Associates Faraday Touch Switches


 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |   Link to DiscoverCircuits.com  |  Privacy Policy

Copyright  January, 1998 - June, 2021     David A. Johnson  All Rights reserved. 

 COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED!