Transistor Circuits, page 2 J-O


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Transistor Circuits, Page 6
Transistors: #'s A B-C D-G H-I J - O P - S T - Z
Last Updated on: Friday, September 19, 2008 04:15 AM

Circuits Designed by Dave Johnson, P.E. :

N-CH AND P-CH TRANSISTORS 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.

NPN/PNP TRANSISTOR TESTER
I designed this circuit about 30 years ago and still use it from time to time. It is powered from a 3v battery. It makes a tone when the transistor tests good. It can be used to determine device type (NPN or PNP) and the base, collector or emitter transistor pins. It can also test most transistors will still connected to a circuit.

Links to electronic schematics, circuits, designs and/or diagrams for engineers, hobbyists, students & inventors:

JFETs offer LC oscillators with few components: 1/20/05 EDN-Design Ideas / (added 5/05)

Keys to Longer Life for CMOS: AN-349 Analog Devices Application Note (app note added 2/06) Here's How CMOS Can be Protected Against Abuse

Latch-Up Protection for MOSFET Drivers: Microchip Application Note Published 5-Feb-03 (app note added 2/06)

Latest Technology PT IGBTs vs. Power MOSFETs: Application Note Microsemi-formerly Advanced Power Technology APT0302 ( app note added 05/07)

LED Flasher 2 Transistor: (circuit / schematic design added 6/06)

Lithium Ion Battery Charging using Bipolar Transistors: Zetec Semiconductors Applications Notes This application note explores the different types of charge techniques and associated discrete pass elements, highlighting the dominant discrete parameters and selection criteria for each charging technique. (app note added 6/06)

Low Cost 1000 Watt 300 Volt RF Power Amplifier for 27.12MHz: Application Note Microsemi formerly Advanced Power APT9701 (added 05/07)

Low Cost Intercom using Transistors: The circuit comprises a 3-stage resistor-capacitor coupled amplifier. When ring button S2 is pressed, the amplifier circuit formed around transistors T1 and T2 gets converted into an asymmetrical astable multivib-rator generating ring signals. These ring signals are amplified by transistor T3 to drive the speaker of earpiece. Current consumption.... (added 10/05)

Low Cost MOSFET Quashes Power Resistor: 06/09/94 EDN-Design Ideas / (added 3/03) At power-on, off-line power supplies use a resistor to provide start-up current for the PWM IC, current that is necessary to start driving the power switch. After a few periods, an auxiliary winding delivers a sufficient voltage to power the IC. Unfortunately, the start-up resistor dissipates heat and .....

Low Level High Accuracy Bipolar Input Differential to Single-Ended Signal Conversion for 24-Bit A/D Single Supply Differential to Single-Ended Conversion Circuit Amplifies Low Level Bipolar Signals and Maintains the LTC2400’s High Accuracy: Design Solutions 5 Design Notes (Linear Technology) (app note added 6/06)

Low Voltage Micropower LC (Colpitts) Oscillator Circuit with Active Load: Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc. (app note added 6/06)

Low-Threshold MOSFETs: Supertex Semiconductors (app note added 2/06)

Making Use of Gate Charge Information In MOSFET and IGBT Data Sheets: Application Note Microsemi-formerly Advanced Power Technology APT0103 ( app note added 05/07)

Matched Pair EPAD MOSFET Array with a Single Supply: Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc. (app note added 6/06)

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

Matching MOSFET Drivers to MOSFETs: Microchip Application Note Published 3-Aug-04 (app note added 2/06)

Micro Spy with FETs: (schematic added 8/03)

Micropower High-Side MOSFET Drivers: AN53 Linear Technology This application note describes the operation of high-side Nchannel MOSFET switch drivers designed specifically for operation in battery-powered equipment, such as notebook and palmtop computers and portable medical instruments. A selection guide simplifies the proper choice of MOSFET and driver for a particular high-side switch application. Circuits to drive and protect load impedances ranging from large inductors to large capacitors are described and a section on surface mount and copper clad shunts is included.

More on two Transistor circuit: 05/16/02 EDN Design Ideas / (added 1/05) In a recently published Design Idea, Jim Hagerman proposes a two-transistor circuit that claims to replace the LTC4300 hot-swappable, two-wire LTC4300 bus buffer ("Two-transistor circuit replaces IC," EDN, Feb 7, 02 EDN Design Ideas / (added 1/05), pg 104). I feel compelled to point out that the LTC4300 offers numerous advantages over this circuit for both buffering and hot-swapping the I2C bus....

MOSFET Beats Murphy's Law: 12/22/94 EDN-Design Ideas / (added 3/03)

MOSFET Circuit UPS Regulator's Output Current: 02/01/96 EDN-Design Ideas / (added 3/03) -Use a current mirror and a power MOSFET to increase the output-current capability of an IC-voltage regulator

MOSFET Current Mode Resonant Coil Driver: (circuit / schematic added 2/06)

MOSFET Current Sensing: Method of mirror current sensing a MOSFET (added 5/02)

MOSFET enhances Voltage Regulator's overCurrent protection: 03/03/05 EDN Design Ideas / (added 5/05) The classic LM317 adjustable-output linear voltage regulator offers a relatively high, if package-dependent, current-handling capability. In addition, the LM317 features current limiting and thermal-overload protection. With the addition of a few components, you can enhance an LM317-based voltage regulator by adding a high-speed short-circuit current limiter (Figure 1).

MOSFET H-BRIDGE schematic and theory: (electronic circuit added 4/05)

MOSFET Power Amp: DIY high power MOSFET amplifier200 Wrms 8 ohms -350 Wrms4 ohms (added 6/06)

MOSFET Power Amplifiers: A discussion of the benefits of the lateral MOSFET output devices used in today’s High Power audio amplifiers (added 5/02)

MOSFET Replaces Switch #1: 01/20/94 EDN-Design Ideas / (added 3/03) By using a cheap, readily available MOSFET, you can use a single-pole switch to turn a bipolar power supply on and off without consuming extra power. In Fig1, the switch simply controls the MOSFET gate, which switches on the negative supply. Resistor R, which can be several megaohms, is not necessary if the ±6V rails are permanently connected to a load, such as an op-amp circuit. Because the MOSFETs RDS (ON) is a fraction of an ohm, power loss is minimal, and the circuit suits moderate-consumption, battery-operated circuitry

MOSFET Replaces Switch #2: 02/03/94 EDN-Design Ideas / (added 3/03) You can use a single-pole switch to turn a bipolar power supply on and off without consuming extra power

MOSFET Serves as Ultrafast plate Driver: 10/03/02 EDN Design Ideas / (added 1/05) The circuit in Figure 1 provides a 20-MHz square wave across a set of highly capacitive ion-deflection plates in an experimental instrument. To get the required deflection, the plate voltage must be 20 to 30V, much higher voltage than conventional logic or driver families can provide. To minimize artifacts, the rise and fall times must be very fast, with a minimum of overshoot and ringing....

MOSFET Switch provides efficient AC/DC conversion: 02/17/00 EDN-Design Ideas / (schematic / circuit added 11/03)

MOSFET Test: This testing procedure is for use with a digital multimeter in the diode test-range with a minimum of 3.3 volt over d.u.t. (diode-under-test).
If your multi-meter is less than that it will not do the test. Check your meter manual for the specs. (added 6/06)

MOSFET Linear Amplifier for 50 MHz: Application Note Microsemi-formerly Advanced Power Technology APT9802 ( app note added 05/07)

MOSFETshunt regulator substitutes for series regulator: 11/25/04 EDN-Design Ideas / (added 5/05) You would normally use a series linear regulator or a dc/dc converter to obtain 3V dc from a higher supply. However, when breadboarding a concept, you may be able to use a shunt regulator, especially if a series regulator of the correct voltage is unavailable. The MOSFET in Figure 1 can replace a Zener diode in a shunt regulator and provide lower output impedance than a Zener diode....

New 500V Linear MOSFETs for a 120kW Active Load: Power MOSFETs are generally designed as switches. Total power dissipated is the sum of "on"-state losses (Id2 x Rds(on)) plus losses generated during the very short switching intervals. Desirable characteristics include the lowest possible ON resistance, high breakdown voltage, very high gain (gfs or Gm), minimum switching losses, and a low gate threshold voltage VGS(th). Application Note Microsemi APT0002 ( app note added 4/08)

New Ultrafast Recovery Diode Technology Improves Performance of High Frequency Power Circuits (Presented At HFPC ‘93 USA): Application Note Microsemi formerly Advanced Power APT9301 (added 05/07)

One Transistor timer: (circuit / schematic design added 6/06)

Op Amps Make JFET Circuits Repeatable: 05/24/01 EDN-Design Ideas / (added 8/03)

Optimizing The Design Of 35kw Single-MOSFET Power Factor Correctors: This paper will define MOSFET gate drive requirements for minimum power losses and lowest EMI, evaluate the layout techniques necessary to limit turn-off voltage overshoots, and provide comparative data on package and mountdown options able to deliver up to 3500W power output from 230V 50/60Hz AC mains. Application Note Microsemi APT9901 ( app note added 4/08)

Optimizing the Design of 3.5kw Single-MOSFET Power Factor Correctors: Application Note Microsemi-formerly Advanced Power Technology APT9901 ( app note added 05/07)

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