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2 transistor amplifier #1:
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2 Transistor Amplifier #2:
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2 Transistor Circuit Replaces IC:
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 |
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2 Transistor LED Flasher #1:
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2 Transistor LED Flasher #2:
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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. |
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25 Watt MOSFET Amplifier:
High Quality simple unit. No need for a
Preamplifier |
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Bipolar Transistor Boosts
Switcher's Current By 12 times:
05/24/01 EDN-Design Ideas / PDF contains
multiple circuits - scroll to find this circuit.
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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. . . |
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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... . |
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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.. . . |
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FET Preamp Cable:
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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. . . |
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Full Featured Transistor Tester: |
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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. . . |
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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... |
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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 .... |
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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. . |
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Low Cost MOSFET Quashes Power
Resistor: 06/09/94
EDN-Design Ideas |
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Micro Spy With FETs: |
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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.. |
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MOSFET Beats Murphy's Law:
12/22/94 EDN-Design Ideas |
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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 |
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MOSFET Current Sensing:
Method of mirror current sensing a MOSFET
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MOSFET Power Amplifiers:
A discussion of the benefits of the lateral
MOSFET output devices used in today’s High Power
audio amplifiers |
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MOSFET PowerAmp:
DIY high power MOSFET amplifier200 Wrms 8 ohms
-350 Wrms4 ohms |
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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 |
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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
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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.. |
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MOSFET switch provides efficient
AC / DC conversion:
02/17/00 EDN-Design Ideas |
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Op Amps Make JFET Circuits
Repeatable: 05/24/01
EDN-Design Ideas / PDF contains multiple
circuits - scroll to find this circuit.
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:
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. .
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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. |
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Single Transistor Flyback Driver: |
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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.. |
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Three Transistor Audio Amp (50
Milliwatt ): Here is
a little audio amplifier similar to what you
might find in a small transistor radio. |
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Transistor & FVCs Make Linear
Anemometer: 09/26/96
EDN-Design Ideas |
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Transistor Audio Preamplifier: |
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Transistor Forms RS232C Digital
Thermometer: 05/09/96
EDN-Design Ideas |
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Transistor Latch improves on/off
Circuitry: 11/23/00
EDN-Design Ideas / PDF contains multiple
circuits - scroll to find this circuit.
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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.. |
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Transistor Organ:
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Transistor Pair Lowers PWM IC's
Start up Current:
03/18/99 EDN-Design Ideas / PDF contains
multiple circuits - scroll to find this circuit
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Transistor quickly Wakes Sleeping
LDO: 09/01/98 EDN-Design
Ideas |
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Transistor Spot Checker:
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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. |
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Transistor Trio Makes Vector
Anemometer: 09/01/97
EDN-Design Ideas |
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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).. |
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Transistors Tame Perfidious
Leakage Inductance:
10/26/00 EDN Design Ideas / PDF contains
multiple circuits - scroll to find this circuit |
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Two Transistor Amplifier:
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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. . |
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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
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Two Transistor FM Transmitters:
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Two Transistor LED Flasher #1: |
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Two Transistor LED Flasher #2:
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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. |
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UHF 100W Transistorized
Amplifier:
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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. . . |
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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... |
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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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