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2 transistor amplifier #1
2 Transistor Amplifier #2
2 Transistor Circuit Replaces IC:  Linear Technology's recently introduced LTC4300 chip buffers I2C clock and data lines to and from a hot-swappable card. This task is difficult because the IC must work bidirectionally
2 Transistor LED Flasher #1: 
2 Transistor LED Flasher #2
2 Transistors Form Bidirectional Level Translator:  11/07/96 EDN-Design Ideas / Illustrates a translation from5 to3V, but it can accommodate almost any other voltage levels, provided the logic-low levels are equal (usually0V), translation from1 to100-Volt are possible although slow.
25 Watt MOSFET Amplifier:  High Quality simple unit. No need for a Preamplifier
Bipolar Transistor Boosts Switcher's Current By 12 times:  05/24/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.
Cascaded Common-Gate FET IC Provides Flexible Level Translation:  07/10/00 Electronic Design - Ideas for Design / Today’s complex systems often feature a multitude of devices incorporating several different logic power families. In order for these mixed-mode systems to operate properly, some type of voltage translation and voltage clamping is needed. This. . .
Circuit reduces negative voltage stresses on control IC:  04/18/2002  EDN - Design Ideas / In a synchronous, buck switching power supply, the two FETS and the output inductor meet at the phase node (Figure 1). The phase node often connects directly to the control IC. The voltage on this node swings from the input voltage to some voltage lower than ground. If the voltage goes too far below ground, the ESD structures or other circuitry within the control IC can become forward-bia... .
Fast, Stable Wideband FET Amplifier:  06/26/00 Electronic Design - Ideas for Design / The design idea presented here is a gain-trimmable wideband FET amplifier with very good speed, high input impedance, and excellent dc stability under all conditions. Transistors Q1 and Q2 constitute a simple, high-speed FET input buffer.. . .
FET Preamp Cable
Forward converters drive power MOSFETs at up to 500 kHz:  05/03/99 Electronic Design - Ideas for Design / Simply by combining two simple circuits, high-gate-capacitance MOSFET transistors can be driven at up to 500 kHz with galvanic isolation (Fig. 1). The. . .
Full Featured Transistor Tester
GaAsFET power supply has negative gate bias, automatic power-up sequencing:  10/04/99 Electronic Design - Ideas for Design / GaAsFETs are frequently used as high-power RF amplifiers for cell-phone repeaters and similar devices. In general, they require a negative supply voltage of −4 V to −5 V to bias the. . .
Gate drive method extends supply's input range:  06/26/03  EDN-Design Ideas / 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...
IC maintains uniform bias for GaAs MESFETs:  08/22/2002  EDN - Design Ideas / The gate-turn-on threshold voltage for GaAs MESFETs (gallium-arsenide metal-semiconductor field-effect transistors) varies considerably from part to part, even within a given lot. That behavior makes biasing difficult, especially if you want to design the device into a high-volume product. To overcome this drawback, you can introduce a current sensor that monitors the bias current and provides ....
Improve FET based gain control:  12/06/2001 EDN - Design Ideas / One problem with standard FET gain-control circuits is increased noise when you use the FET as a part of a resistive attenuator in series with an op amp. This configuration attenuates the signal before amplification; hence, it requires much higher gain bandwidth and better noise performance from the op amp. .
Low Cost MOSFET Quashes Power Resistor:  06/09/94 EDN-Design Ideas
Micro Spy With FETs:
More on two transistor circuit:  05/16/2002  EDN - Design Ideas / 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, 2002, 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
MOSFET Circuit UPS Regulator's Output Current:  02/01/96 EDN-Design Ideas / Use a current mirror and a power MOSFET to increase the output-current capability of an IC-voltage regulator
MOSFET Current Sensing:  Method of mirror current sensing a MOSFET
MOSFET Power Amplifiers:  A discussion of the benefits of the lateral MOSFET output devices used in today’s High Power audio amplifiers
MOSFET PowerAmp:  DIY high power MOSFET amplifier200 Wrms 8 ohms -350 Wrms4 ohms
MOSFET Replaces Switch #1:  01/20/94 EDN-Design Ideas / 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 megohms, 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 / 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:  10/03/2002  EDN - Design Ideas / 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
Op Amps Make JFET Circuits Repeatable:  05/24/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.
Resettable High-Speed Fuse Uses FET As A Sense Resistor:  11/05/01 Electronic Design - Ideas for Design / This design idea describes a resettable high-speed fuse that uses only a few off-the-shelf parts, resets itself after blowing, and doesn't require a special current-sense resistor. While the circuit has been designed to switch on a negative current. . .
Simple Circuit Detects Current Pulses:  01/06/94 EDN-Design Ideas / The pulse detector provides a visible indication of positive and negative current pulses. The pulses amplitudes can vary from20 to150 mA. The pulses durations can range from10 to40 msec, and their repetition rate can span40 to180 pulses/minute.
Single Transistor Flyback Driver
Single transistor sequences multiple supplies:  08/08/2002  EDN - Design Ideas / Many DSP chips, microprocessors, FPGAs, and ASICs require multiple power supplies that must deliver different voltages in a specific start-up sequence. Out-of-sequence voltages can cause excessive input current, logic errors, or even device failure. To sequence different supplies, a common approach is to regulate a lower voltage from a higher voltage using a linear regulator..
Three Transistor Audio Amp (50 Milliwatt ):  Here is a little audio amplifier similar to what you might find in a small transistor radio.
Transistor & FVCs Make Linear Anemometer:  09/26/96 EDN-Design Ideas
Transistor Audio Preamplifier:
Transistor Forms RS232C Digital Thermometer:  05/09/96 EDN-Design Ideas 
Transistor Latch improves on/off Circuitry:  11/23/00 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.
Transistor linearly digitizes airflow:  09/19/2002  EDN - Design Ideas / A sensitive and reliable way to measure airflow is to take advantage of the predictable relationship between heat dissipation and air speed. The principle of thermal anemometry relies on King's Law, which dictates that the power required to maintain a fixed differential between the surface of a heated sensor and the ambient air temperature increases as the square root of air speed..
Transistor Organ
Transistor Pair Lowers PWM IC's Start up Current:  03/18/99 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit
Transistor quickly Wakes Sleeping LDO:  09/01/98 EDN-Design Ideas
Transistor Spot Checker
Transistor tester fits into your pocket:  12/20/2001 EDN - Design Ideas / It can be helpful to rapidly and easily determine the polarity (npn or pnp) and function of a transistor. The pocket-transistor tester in Figure 1 is ideal for quickly testing without regard to such parameters as gain and frequency response. You connect the transistor, or device under test, between the collectors, T, of an astable multivibrator.
Transistor Trio Makes Vector Anemometer:  09/01/97 EDN-Design Ideas 
Transistors offer thermal protection for controller:  07/19/2001 EDN - Design Ideas / When a switch-mode power-supply controller, such as On Semiconductor's NCP1200, operates at a high ambient temperature, you should protect the entire power supply against lethal thermal runaway. The NCP1200 operates directly from the power mains without an auxiliary winding; therefore, the die in the IC dissipates power (Figure 1)..
Transistors Tame Perfidious Leakage Inductance:  10/26/00 EDN Design Ideas / PDF contains multiple circuits - scroll to find this circuit
Two Transistor Amplifier: 
Two transistor circuit replaces IC #1:  02/07/2002  EDN - Design Ideas / Linear Technology's recently introduced LTC4300 chip buffers I2C clock and data lines to and from a hot-swappable card. This task is difficult because the IC must work bidirectionally, meaning that you can simultaneously and actively drive both sides. However, as is sometimes the case, you can replace a complicated circuit by a simple one without much loss of performance. .
Two Transistor Circuit Replaces IC #2:  Linear Technologys recently introduced LTC4300 chip buffers I2C clock and data lines to and from a hot-swappable card. This task is difficult because the IC must work bidirectionally
Two Transistor FM Transmitters
Two Transistor LED Flasher #1: 
Two Transistor LED Flasher #2
Two Transistors Form Bidirectional Level Translator:  11/07/96 EDN-Design Ideas / Illustrates a translation from5 to3V, but it can accommodate almost any other voltage levels, provided the logic-low levels are equal (usually0V), translation from1 to100-Volt are possible although slow.
UHF   100W Transistorized Amplifier
Use a FET as a linear temperature sensor:  05/27/97 Electronic Design - Ideas for Design / In many linear applications of field-effect transistors, the FET is used as a constant-current device for large VDS (i.e., drain-to-source voltage) or as ohmic resistance for small VDS. In the region before pinch-off, the FET is. . .
Voltage Reference improves JFET:  10/26/00 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit The common JFET current-source in Figure 1a has average output impedance and depends heavily on the JFET's V P and I DSS variations. These manufacturing variations limit the initial accuracy of the current setpoint that the circuit can obtain with a...
Yaesu FT 736R Doppler Compensation:  The Yaesu FT-736R CAT interface port uses Transistor-Transistor Logic (TTL) which operates at 0V, 5V levels for "0" (low) and "1" (high) logic states. Computer RS-232 serial (COM) ports operate at -10V, +10V levels for low and high logic states. You therefore need an RS-232/TTL converter to control this radio.
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