|
Current Source /
Current Sink Circuits Page 2
Current Source / Current Sink: #-C
D-R S-Z
Last Updated on:
Friday, March 12, 2010 12:07 PM |
| |
|
|
Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
|
|
|
|
DAC & flip flops form constant current source - 04/23/09 EDN- Design Ideas,
Using two flip flops, you can program a serial-input DAC to produce a constant 4 mA.....(design
idea added 08/09) |
|
Derive a simple high current source from a lab supply - 10/16/08 EDN-Design Ideas:
, With a few additional components, you can configure a laboratory power supply
as a high-current source.....(design idea added 08/09) |
|
Design Formulas Simplify Classic V/I Converter - 01/20/00 EDN-Design
Ideas:.....(design idea added 7/03) |
|
Digital Current Source is Nonvolatile - 05/07/02 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 RFand
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.....(design idea added 1/05) |
|
Dn25 Series: Constant Current Sources - Supertex Semiconductors (app note
added 2/06) |
|
Error compensation improves bipolar current sinks - 07/06/06 EDN-Design Ideas:
Circuit compensates for pass-transistor's base-current error.....(design idea added
05/07) |
|
High Output Impedance Current Mirror - Circuit Ideas for Designers Application
Notes Advanced Linear Devices, Inc. (app note added 6/06) |
|
High Output Impedance Current Source - Circuit Ideas for Designers Application
Notes Advanced Linear Devices, Inc. (app note added 6/06) |
|
High Speed Regulator Makes Great Current Source - 07/16/98 EDN-Design Ideas: The
circuit in Figure 1 is a low-cost step-up/step-down dc/dc converter. By definition,
its input can range above and below the regulated voltage. The circuit includes a
simple switchmode boost converter (IC1)….....(design idea added 11/05) |
|
JFET cascode boosts current source performance - 05/11/06 EDN-Design Ideas: A
constant-current source minimizes the reference circuit's sensitivity to
supply-voltage fluctuations and extends the voltage reference's operating voltage
beyond its 5.5V maximum rating.....(design idea added 05/07) |
|
Linear Constant Current LED Lamp Dimmer - This circuits drives24 white light LEDs
with an adjustable constant current. (added 4/02) |
|
Lnd1 Series: Constant Current Sources - Supertex Semiconductors (app note
added 2/06) |
|
Low-Overhead Current Source - This circuit has a very low overhead of just 120uA,
and most of that is transistor base drive. The voltage reference only uses 20uA of
current. Also, the circuit is designed to saturate if required, to maintain output
current. The overhead current quickly goes up at that point. This circuit is ideal for
squeezing out the last bit of battery power for an LED circuit. Designed by
Andrew R. Morris (added 09/05) |
|
|
PC Controlled Voltage or Current Source - Fair Waring, site contains annoying
popups. This project was begun as a means to charge and cycle NiCad
batteries but has become a versatile tool for experiments requiring either a
controlled voltage up to +30V and/or a current of +/2.5 Amps. (added 5/05) |
|
Photo-Diode Current-To-Voltage Converters - National Semiconductor Application
Note (app note added 2/06) |
|
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.....(design idea added 03/03/03) |
|
Precision current source is software programmable - 12/17/04 EDN-Design Ideas:
With the addition of a few inexpensive miniature components, the hard-wired,
voltage-controlled current source of yesterday becomes a software-programmable
voltage-controlled current source(Figure 1). A digital potentiometer, IC1 in
conjunction with a precision op amp, IC2, sets current through a pass transistor,
ISET, and a shunt regulator, IC3, provides a constant reference voltage
across.....(design idea added 12/04) |
|
Reference Stabilizes Exponential Current - 10/25/01 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.....(design idea added 1/05) |
|
|
|
| |
Current Source / Current Sink: #-C
D-R S-Z
|
|
|
