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Transistor Circuits, Page 1
Transistors:  #'s    A     B-C     D-G     H-I     J - O     P - S     T - Z
Last Updated on: Friday, August 29, 2008 02:34 PM
 

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, designs for engineers, hobbyists, students & inventors:

Defining Diode Data Sheet Parameters:  Application Note Microsemi formerly Advanced Power APT0301 (added 05/07)

Designing VCOs and Buffers Using the UPA family of Dual Transistors (3/99) :  Application Note California Eastern Laboratories Doc #927  (app note added 6/06)

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 and Summed Outputs:  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 6/06)

Differential EPAD MOSFET  Matched-Pair Circuit with Summing Output:  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 6/06)

Diode-Connected EPAD MOSFET  with Buffer Amplifier Output:  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 6/06)

E-B-C Transistor Pin Identifier:  Tests transistors and diodes for polarity Simple circuitry 9V Battery operation (added 2/05)

Eliminating Parasitic Oscillation between Parallel MOSFETs:  Application Note Microsemi-formerly Advanced Power Technology APT0402  ( app note added 05/07)

Emergency Lighting Systems and Battery Powered Fluorescent Lighting: High Current To92 Switching Transistors Provide 87% DC-AC Conversion Efficiency:  Zetec Semiconductors  Applications Notes An overview of the principles behind typical emergency lighting systems, fluorescent tube behaviour, and the requirements of the transistors for efficient voltage inversion. The note also includes two "Royer" based designs for low voltage systems.   (app note added 6/06)

Equivalent Transistors:  (circuit / schematic design added 6/06)

Fast Charging Batteries with Zetex High Current PNP Transistors and Benchmarq Controller ICs:  Zetec Semiconductors  Applications Notes High current, fast switching PNP transistors are capable of replacing large packaged P-Channel MOSFETs, when attention is paid to the base drive requirements. This enables space and performance efficient designs at much reduced cost.   (app note added 2/06)

Fast IC Power Transistor with Thermal Protection:  National Semiconductor Application Note   (app note added 6/06)

Features and Applications of the FMMT617 and FMMT717 SuperSOT SOT23 Bipolar Transistors: 3A NPN and 25A PNP SOT23 Bipolar Devices:  Zetec Semiconductors  Applications Notes An introduction to the low voltage variant members of the Zetex SuperSOT family, including a description of the high current capability, a comparison of the extremely low losses evident when compared with competing MOSFET options, and suggested applications.   (app note added 2/06)

Features and Applications of the FMMT618 and 619: High Current SOT23 Replace SOT89, SOT223 and D-Pak:  Zetec Semiconductors  Applications Notes This note introduces the FMMT618 and 619 two NPN variants of the Zetex SuperSOT family, and includes parametric overview, thermal capability discussion, brief description of the Matrix geometry, and applications.   (app note added 2/06)

FET Audio Mixer:  (circuit / schematic design added 6/06)

FET biasing targets battery-powered PWM applications:  11/21/05  EDN Design Ideas  /  (added 10/06)  Reference provides constant bias voltage regardless of supply-voltage variations.

FET Circuit Applications:  National Semiconductor Application Note   (app note added 2/06)

FET Preamp Cable:  (schematic added 8/03)

First Demonstration of 4H-SiC RF Bipolar Junction Transistors on a Semi-insulating Substrate with fT/fMAX of 7/5.2 GHz Semi-insulating Substrate with fT/fMAX of 7/5.2 GHz :  Application Note Microsemi MTTS05 (added 05/07)

FM Transmitter (rf/2bjttx):  (electronic circuit added 7/03)

FMMT718 Range, Features and Applications:  Replacing SOT89, SOT223 and D-Pak Products with High Current SOT23 Bipolar Transistors:  Zetec Semiconductors  Applications Notes Following on from AN11, this note introduces other members of the Zetex SuperSOT series, and concentrates on the PNP options and complementary NPN/PNP designs.   (app note added 2/06)

Four Transistor Tracking Transmitter:  (electronic circuit added 9/02)

Four-transistor H-bridge:  an interesting 4-transistor H-bridge variant; this is cheap and easy to build, and best of all is "smokeless" (i.e., no combination of inputs can cause the bridge to self-destruct).   (added 6/06)

Full Featured Transistor Tester:  (schematic added 8/03)

Fun and Games with Transistor Astables:  This project is all about fiddling with devices. Often people jump into electronics at the integrated circuit (IC) level, wiring IC's up without much knowledge of what's going on underneath. This project doesn't involve any IC's, just a few discrete components. That doesn't mean it's boring as there's plenty to be gained by building this circuit and having a look at how it works. (added 6/06)

Fuzz-box:  All-FET design.  Valve-like distortion behavior (added 3/05)

Gate Drive Design for Large Die MOSFETS:  Application Note Microsemi-formerly Advanced Power Technology APT9302  ( app note added 05/07)

Gate drive method extends supply's input range:  06/26/03 EDN Design Ideas  /  (added 1/05)  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....

Transistors:  #'s    A     B-C     D-G     H-I     J - O     P - S     T - Z



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