40 Volt Current Source operates From 40 to +85�C:
06/22/1995 EDN - Design Ideas / Wide Output Current range
Sources that accommodate a wide Supply and Temperature range,
based on LM317 |
60 MCurrent Source Feeds Telecomm Lines: 12/12/97 EDN-Design
Ideas |
BiPolars Provide StableCurrent Source: 09/24/98 EDN-Design
Ideas |
Circuit forms novel floating current source: 05/01/03 EDN-Design
Ideas / Figure 1 shows a polarization circuit applicable to
ISFET (ion-sensitive field-effect-transistor) sensors. ISFETs
are solid-state chemical sensors that measure the pH value of a
solution in biomedical and environmental applications, for
example. The circuit in Figure 1 is extremely simple; it sets
fixed-bias conditions for ISFET sensors (VDS=I0 RX; IDS=I0).... |
CMOS Buffer Delivers Precise Current Pulses: 12/08/94 EDN-Design
Ideas |
Constant current Amplifier : |
Constant Current Battery Charger: |
Current Source has High Output Impedance: 06/22/00 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find the one
of interest / Composite10-mA current-source configuration that
has a compliance voltage of5 to42V, a set-current error of less
than1% and an output impedance of greater than100 megaohms HAVE
TO LOG IN TO RETRIEVE CIRCUIT |
Design Formulas Simplify Classic V/I Converter: 01/20/00 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit. |
Digital current source is nonvolatile: 02/07/2002 EDN -
Design Ideas / Digitally programmable current sources that
feature automatic trimming and retain the setting despite
power-down cycles are useful in applications such as RF- and
laser-communications drivers. The circuit in Figure 1, for
example, is particularly suited for setting the drive current
for the optical pump in widely tunable VCSELs (vertical-cavity
surface-emitting lasers). . |
High Speed Regulator Makes great Current Source: 07/16/98
EDN Design Ideas -- Bandwidth of this circuit measures more
than1 MHz, only the selected MOSFET and the ratings of the input
supplys bypass capacitors limit the voltage compliance
|
Linear Constant Current LED Lamp Dimmer: This circuits
drives24 white light LEDs with an adjustable constant current.
|
PC Controlled Current Source Supplies 100V, 1A, 16Bit Pulses
: 04/29/02 Electronic Design - Ideas for Design / The current
source shown in the figure is designed to support toroidal-cavity
nuclear-magnetic-resonance electrophoresis (TCNMRE) measurements
of molecular electrical mobility in chemical samples. To do
so,... |
Precision Current Sink Costs Less than $20: 03/13/98 EDN-Design
Ideas / Simple active load circuit for current from1 mA to1A and
voltage from3 to40-Volt |
Reference stabilizes exponential current: 10/25/2001 EDN -
Design Ideas / In an antilog converter, the difference between
the base voltages of two transistors sets the ratio of their
collector currents: The use of matched transistors balances the
first-order temperature coefficient but leaves a
temperature-dependent gain term, q/kT. Classic antilog circuits
use a thermistor in the drive circuitry to correct this
temperature dependency. . |
Simple Current Source & Sink Circuits have Low TC: 07/04/96
EDN-Design Ideas |
Simple High Efficiency Current Source Is Adjustable:
04/28/03 Electronic Design - Ideas for Design / IOccasionally,
the need arises for a simple current source that can be easily
adjusted over a relatively wide range of current levels. The
circuit shown in the figure uses a 200-kHz pulse-width
modulation... — |
Simple Scheme keeps Current Drain Constant: 04/12/01 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit. |
Step up / Step Down Current Source Charges Batteries:
07/16/98 EDN Design Ideas |
Stepup/stepdown Current Source Charges Batteries: 06/05/96
EDN-Design Ideas |
Voltage to current converter drives white LEDs: 06/27/2002
EDN - Design Ideas / You sometimes need to drive a white LED
from one 1.5V battery. Unfortunately, the forward voltage of a
white LED is 3 to 4V. So, you would need a dc/dc converter to
drive the LED from one battery. Using the simple circuit in
Figure 1, you can drive one white LED or two series-connected
green LEDs, using only a few components.. |
Voltage To Current Converter Works From Single Supply Rail:
02/17/03 Electronic Design - Ideas for Design /
Voltage-to-current converters feeding to grounded loads often
find their way into industrial measurements and control
applications. The conventional textbook circuit needs both
positive and negative-supply rails |